Model Engine Maker

Engines => Your Own Design => Topic started by: mike mott on December 11, 2014, 05:31:01 PM

Title: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 05:31:01 PM
This is the beginning of my little engine. it is for a model boat, of an open launch built in 1909 for Andrew Mellon there were two launches made they are 19 feet long and are in the Muskoka Lakes area.

M Model will be 28 inches long and is built to a scale of 1:8 the hull will be built with steam bent ribs and Cedar planking. the engine is mostly brass and silver steel the bore is .312 and the stroke is .5

I have made a few mistakes in getting going on this engine, I started over three times and now things are moving along well.
Like all (prototype ) work designing something to represent a full size artifact in scale requires some creative solutions to parts which get very small.

I am familiar with a lot of modelmaking practices having done it commercially for a long time, but building a working engine is new to me. the little engine in my profile picture is a non working rotary engine for the model of the McCurdy Biplane that is in the Canadian Aviation Hall of Fame.

So I will add more information as I restructure the posts for this build

First a picture of my original concept drawing and a shot of the real engine and the real boat. The pictures of the engine and boat are Courtesy of the owner of the boat who has been very kind in answering a ton of questions about the boat and supplied me with a lot of pictures of the boat. the owner has given me permission to post the pictures.

mike


Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: b.lindsey on December 11, 2014, 05:43:06 PM
That will be a nice project Mike. The size of the engine is getting pretty small at that scale...could (and I take it HAS)  presented some interesting challenges but I will be looking forward to it.

Bill
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 05:49:05 PM
Looks like I will have to use a picture hosting site to get the pictures in line with text rather than attachments at the end of the text.

First I decided that I needed an easy way to tap small holes, so I am now using collars over the taps and tap the hole right after drilling  by using these collars I can feel the cutting without unduly imparting too much pressure, this also helps to keep the mill quill lower that with adding any of the neat designs that I have seen for this task.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4749x800_zpse785dd1c.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4749x800_zpse785dd1c.jpg.html)

this is a large tap 6 x .5 metric. I am also using a lot of 0x80 which has its own collar.

I have also had to make a few cutters to achieve some of the different cuts I have needed, this one for the cavity in the top of the cylinder which on the full size engine is a cast space and contiguous with the rest of the cylinder, there was no way that I could make this engine that way with any hope of making it run so I have separated the top of the cylinder to be able to deal with valve ports and the water jacket areas.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4745x800_zpsb2445e62.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4745x800_zpsb2445e62.jpg.html)

This next picture shows the test cut for the combustion area that the mill will be used for the radius is .015"

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4744x800_zps9d13ef8d.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4744x800_zps9d13ef8d.jpg.html)

will add further progress soon.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: tvoght on December 11, 2014, 06:33:23 PM
I'm looking forward to watching your progress, Mike. The prototype engine sure is pretty.

--Tim
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on December 11, 2014, 07:16:58 PM
Good looking build, I will be following along  :ThumbsUp:  :ThumbsUp:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 07:20:50 PM
The most tricky part was drilling the inlet and exhaust holes (still a bit gun-shy after the first mistake) I had to set the block up with a compound angle, for each hole the inlet ones on the outside and the exhaust ones in the middle. Now the hand work filing the surface shapes is under way. I also increased the size of the valve heads to .125 from .093 inches. The bore of the cylinders is reduced to 5/16 from 3/8ths in order to get more space for water circulation.

 I finished shaping the insert for the bottom of the jacket sweated it in place and bored the holes for the sleeves, also did some shaping of the top part of the cylinders. after making a second milling cutter for the curves on the top.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4771x800_zpsea9a7008.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4771x800_zpsea9a7008.jpg.html)

The stainless sleeves are reamed and fitted, they are a press fit. there are also a couple of flats filed into the bottom sides to prevent the sleeves from dropping by being keyed to the hole in the top of the crankcase.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4797x800_zps90722f92.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4797x800_zps90722f92.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4800x800_zpsd6ece607.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4800x800_zpsd6ece607.jpg.html)

one of the difficulties of working with the small sizes is that when drawing they are as big as the screen and it is a constant effort to remember the real size as I am drawing.  when an area looks about right and then I realize that the dimension might be only 1/64th I have to do some rethinking.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/timinggears_zps5500958b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/timinggears_zps5500958b.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/sparkplug_zpsb000b3b5.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/sparkplug_zpsb000b3b5.jpg.html)

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 07:52:41 PM
I had to make another cutter to make the recesses in the main flanges
A close up of the new cutter, I needed a long reach with a small diameter cutting edge to fit next to the body of the case. it is hardened drill rod the diameter at the cutting face is .086" The bolt holes are .060 and the case it tapped ready for the 0x80 bolts.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4840x800_zps4760a5cd.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4840x800_zps4760a5cd.jpg.html)

I have  drilled the holes to accept the camshaft bearings they are larger because I need to be able to clear the raised cams.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4829x800_zps0d52e919.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4829x800_zps0d52e919.jpg.html)

 it looks like the gears for the timing are 64 teeth and 32 teeth respectively. I do not have dividing plates for my rotary table and so it makes sense to use divisions of 360 for making the gears. all the standard gears that are in the ball park for the diameters that I am locked into are not the correct ratio of 2:1. 64DP comes the closest.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/timinggears_zps5500958b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/timinggears_zps5500958b.jpg.html)

I have decided to bite the bullet and make them to a DP of 75 which gives me 60 teeth and 30 teeth for the diameters that I need so now I also need to make the gear cutters for both sizes which means a number 3 cutter and a number 2 cutter. My 48 DP cutters which I made a few years ago are just too big.

There is a great article in the Model Engineer October 1 1971 issue by D J Unwin on how to make gear cutters with all the formulas for making them.

Set up the table of offsets to machine the curved inner surface of the oil pan, and after two hours of cranking the block back and forth the shape slowly emerged. I lowered the cutter .010" for each pass.  Next I will cut away the negative areas where the cranks will rotate and either side of the bottom of the crankcase then flip it over to finish off the bearing recesses. then a brass shell will get soldered onto the cross members, creating the hollow shape.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4844x800_zps823244c0.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4844x800_zps823244c0.jpg.html)

I made it this way because I was stumped as to how to get the inside shapes of the oil pan, I suppose I could have set up a boring bar and scooped out the recesses the only issue with doing it that way was being able to have an opening underneath the central bearing beam to allow the oil to move about in the bottom and equalize rather than being isolated to each recess. the other advantage to making it this way is is that I will be confident that the wall thickness will be consistent.

 The picture shows the material being removes that will become the hollow areas' some parts were machined by the numbers and the bulk was just milled away by eyeballing it.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4846x800_zpsffa122a1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4846x800_zpsffa122a1.jpg.html)

Next the 1/32 thick sheet was annealed and curved over a steel bar.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4853x800_zpsab760179.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4853x800_zpsab760179.jpg.html)

It took a while to get it fitted cleanly, the flat area on the middle bearing wall is to allow the oil to pass through to equalize both chambers. After soldering them together I roughed out the half round bottoms for the crankshaft and drilled and tapped all the 0x80 holes for the studs.

I looked at all my stashes of steel wire and rods looking for some .060 to make the steel 0x80 studs from. I could not find any that was exactly .060" I then came across a most unlikely source, the re-bar ties left over from building the house just happened to be .060 the stuff threaded up a treat. had to make a small open ended wrench to get to the valve side because of the overhang.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4865x800_zps0f20cb50.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4865x800_zps0f20cb50.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4883x800_zps82fc550d.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4883x800_zps82fc550d.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4885x800_zps588596a1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4885x800_zps588596a1.jpg.html)

first assembly of the 1/8th shaft to see the basic proportions.

 (http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4891x1024_zps1da8fd9e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4891x1024_zps1da8fd9e.jpg.html)

Mike






Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: jschoenly on December 11, 2014, 08:03:53 PM
There's a 1:1 Scale one of these engines for sale in NY right now on Engine ads:

http://www.enginads.com/classifieds/showproduct.php/product/106898/cat/8

Keep up the great work.  I really love seeing these posts!
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 08:24:23 PM
Thanks Jared, my that engine looks to be in rough shape.

the parts for the crankshaft.
First I thinned down a piece of 1/8th gauge-plate to .094 then drilled and reamed 8 holes to 1/8th diameter.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4892x800_zps394c192d.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4892x800_zps394c192d.jpg.html)

Next I cut the piece into the four plates for the sides of the con rod bearings part of the crankshaft, I used a new blade in the jewelers saw.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4895x800_zpsd4c21e5e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4895x800_zpsd4c21e5e.jpg.html)

A 1/8th set of dowels were slipped through the holes and the group were clamped in the vice and filed to shape.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4898x800_zps942a3988.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4898x800_zps942a3988.jpg.html)

Then polished up with 400, 600, and 1200 wet and dry sandpaper., I like it when I can get a reflective surface, then I know it is pretty smooth.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4900x800_zps0e5b6026.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4900x800_zps0e5b6026.jpg.html)

I turned up the .344" long 1/8 inch diameter shafts for the big ends of the con rods and did a dry assemble to see how the whole lot looks.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4905x800_zpsf3f4c5ae.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4905x800_zpsf3f4c5ae.jpg.html)

My silver soldering was a great success..... not so with the clean up  made the classic mistake of beginning to cut out the wrong piece

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4910x800_zps02601fb7.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4910x800_zps02601fb7.jpg.html)

I went ahead and cleaned it up because after letting the universe know what a silly move it was with a little colourful language, I wanted to see how the shaft fit and can also use it as a placeholder to test fit the con-rods and pistons knowing that I do have to build a new one.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4914x800_zps00a7b75b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4914x800_zps00a7b75b.jpg.html)

The following sequence shows most of the steps and elements in the stop cocks.
First picture shows some 1 inch tapered clock pins cut to length prepared for soldering

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4957x800_zpsa818420e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4957x800_zpsa818420e.jpg.html)

I am using tapered clock pins for the stop cocks

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4959x800_zps505f28c8.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4959x800_zps505f28c8.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4974x800_zpsd8ec8f91.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4974x800_zpsd8ec8f91.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4988x800_zpsf1df5db4.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4988x800_zpsf1df5db4.jpg.html)

In the palm of my hand for scale

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_4990x800_zps31f363d5.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_4990x800_zps31f363d5.jpg.html)

next I will add the section on the reverse gearbox.

mike


Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 11, 2014, 10:33:45 PM
 I had some gear-heads from some pretty old servomotors full of very tiny gears and pinions all with micro ball races. I stripped these apart to see if there was anything that I could use to fabricate the revers mechanism with.
(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5033x1024_zpsdb1fbc06.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5033x1024_zpsdb1fbc06.jpg.html)

With a bit of careful re-machining a couple of pinions and one of the main drive gears I think I will be able to pull this off, the progress so far.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5034x1024_zpsbcea5514.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5034x1024_zpsbcea5514.jpg.html)

The entire gearbox is covered with a protective shield (no doubt to prevent feet or clothing from getting snagged) on the full sized boat. So I am working with some drawings from the day showing how these gearboxes worked, and fitting in the gears that I have to make the mechanism work.

The originals used a series of clutch plates and the forward /reverse lever either caused the outer casing to be rigid hence letting the internal planetary gearing to impart a revers motion to the prop shaft, or they clamped the prop shaft and casing together causing the whole body to revolve giving a forward motion. The vertical position of the lever caused a neutral position for the prop.
 
Here is a drawing of the progress of this design so far, I have re-machined the pinions already the shafts were pretty hard and it was nerve wracking to say the least.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/reversegearbox_zpsb05a29de.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/reversegearbox_zpsb05a29de.jpg.html)

I am made the outer casing of brass, this will allow the gears to seat in brass giving a quasi bearing, similar to an old clock where the gears are steel and the clock plates brass.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5040x800_zps8a82f307.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5040x800_zps8a82f307.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5039x800_zpsea806ed6.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5039x800_zpsea806ed6.jpg.html)

All dry assembled I also spotted three holes for some 0x80 bolts to ensure the casing and cone stay together and do not move relative to each other. I did check the reverse by rotating the prop to see that it actually worked to this stage. still a long way to go to get it all mounted and working in situ.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5037x800_zps79b65439.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5037x800_zps79b65439.jpg.html)

The gear for the prop fits through the end that will be shaped with the cone recess. this short video shows the revers mechanism in operation.

I have now started to make a new gearbox with some 48DP brass pinion wire which has 10 teeth, the shafts will be .062 wire, I have made this decision because the very tiny gears are an unknown quantity for me, even though they do work.

It did work though so I am pleased about that. here is a short video.
   
mail_id=Y2xpcF90cmFuc2NvZGVkfDk1OTI0ZmZmMDFmM2RiMjJlOGE2YzJlM2ZmMjI2YzYyOTA1fDE5NjA2NDl8MTQxODE5Nzk2Mnw3NzAx&utm_campaign=7701&utm_medium=clip-transcode_complete-finished-20120100&utm_source=email


mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on December 11, 2014, 10:48:23 PM
Nice work on that gear box Mike, It looks like you have plenty of spare parts for the first design so it might be useful for some other project.

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on December 12, 2014, 07:30:58 AM
Magnificent work, and so small  :praise2:  :praise2:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 14, 2014, 06:11:31 AM
Dan , Roger  Thanks for your kind remark.

I have reworked the gearbox now for the third time regarding the casing and with these small gears the precision is critical I have discovered.

here is a video of the new gears and casing.


Everything runs very smoothly now.

I followed the formula for determining the pitch circles and found that things were a bit tight, so added .005" to the circle and it made a huge difference.  this is probably because I am using some 48DP pinion wire for the whole mechanism to keep things simple.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: fumopuc on December 14, 2014, 08:05:37 AM
Hi Mike, from my point of view, this little gear box is a masterpiece.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: PStechPaul on December 14, 2014, 09:21:33 AM
Quite impressive and excellent work on such tiny parts. I'll be following with interest. Thanks for sharing your accomplishments.  :praise2:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: b.lindsey on December 14, 2014, 01:34:02 PM
Beautiful work Mike...I love the little gearbox. I am following along even if quietly.

Bill
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Don1966 on December 14, 2014, 03:47:49 PM
Hi Mike just catching up on you built and I have to say you are doing some excellent work. Just love the gear box and working with brass is one of my loves. I will be following along to see some of your fabrication work. ............ :ThumbsUp:



 :popcorn:
Don



Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 15, 2014, 05:29:23 PM
In order for the gearbox to be able to lock so that the prop rotates forward there is a clutch that is splined, I have been wracking my brains working at finding a way to make a small spline. This morning as I woke up it hit me.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5050x800_zps53e0b7f6.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5050x800_zps53e0b7f6.jpg.html)

Yup the trusty old allen head cap screw has a negative hex to accept the hex key, I matched up a 5/16 cap screw with some 1/4 inch hex brass. the steel collar will revolve in the base of the forward/reverse lever and will move about 1/64 to clamp the prop shaft to the gearbox causing the forward motion. the hex part will be pinned to the prop shaft, and a loose clamping collar will be inserted between the hex collar and the casing of the gearbox, when the lever is pulled back the hex collar will move forward clamping the case and loose collar hence locking the case to the prop-shaft

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5063x800_zps748719cd.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5063x800_zps748719cd.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5065x800_zps916b9e3b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5065x800_zps916b9e3b.jpg.html)

The revers is accomplished by clamping the gearbox inside a steel band which was made from some steel rings turned up and silver soldered together. As the gearbox is clamped the splined collar also releases the loose clamping collar allowing the gears inside to impart the reverse

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5068x800_zps7e79024c.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5068x800_zps7e79024c.jpg.html)


(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5072x800_zps4e1627fb.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5072x800_zps4e1627fb.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5079x800_zpsc22ab981.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5079x800_zpsc22ab981.jpg.html)

When I cut the slot on the top of the band it automatically sprung to a smaller diameter which works in my favour because in order to open the band a wedge has to slide forward, this wedge is connected to the forward reverse lever.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5083x1024_zpsd38333c8.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5083x1024_zpsd38333c8.jpg.html)

Mike




Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: smfr on December 15, 2014, 05:32:47 PM
This is a very intriguing build, Mike. It's interesting to see the gearbox come together  :ThumbsUp:

Simon
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on December 15, 2014, 06:30:59 PM
Very nice Mike,
Another source for a small spline is a cheep socket. I was wondering how the controls on the reverse was going to work nifty solution. Did the original reverse gear work with a similar method?

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 15, 2014, 07:26:12 PM
Simon, thanks
Dan yes the original used a set of clutch plates to do the same things as well as the band clamps, each manufacturer had a slightly different way of doing things. see this link http://babel.hathitrust.org/cgi/pt?id=mdp.39015002071820;view=1up;seq=343 (http://babel.hathitrust.org/cgi/pt?id=mdp.39015002071820;view=1up;seq=343)

and this page 

http://babel.hathitrust.org/cgi/pt?id=mdp.39015002071820;view=1up;seq=345 (http://babel.hathitrust.org/cgi/pt?id=mdp.39015002071820;view=1up;seq=345)


It describes the way these reverse gearboxes functioned. I have been using this document to help sort out my own gearbox, i had to make changes because of the small size I am working with and because I am not a watchmaker, I had to use other ways.


Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on December 15, 2014, 08:23:31 PM
I do like your spline solution  :ThumbsUp:  :ThumbsUp: I think that I have seen a picture in Hiscox's book of a reversing gearbox with a bevel gears and clutches that used the propeller shaft thrust to keep the clutches engaged.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 16, 2014, 05:41:15 AM
Today I made the actuating lever to open and close the clamp ring, the lever is wedged so that in the closed position the width across the flange at the bolt is .250" and when open the the width is .290"

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5100x1024_zpse9474244.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5100x1024_zpse9474244.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5099x1024_zpsf9ef6f52.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5099x1024_zpsf9ef6f52.jpg.html)

here is a video of the way it works.



Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on December 16, 2014, 03:51:54 PM
Nice work Mike, thanks for the drawing links.

I had to check what the hex hole things I bought a few years back were called. If you need a long hex hole look for steel hexagon sleeves. Here is an example:
http://www.sdp-si.com/web/html/newprdrsleeves3.htm

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 16, 2014, 05:56:23 PM
Dan thanks I had forgotten the name of that company, many years ago I had their catalogue.  looks like they have greatly expanded their range of products.

mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 17, 2014, 10:15:32 PM
I realized that the tabs were too narrow to hold the clamp ring so made a new one from a solid ring which required a fair bit of milling and hand filing.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5108x800_zpsa6b6a2c1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5108x800_zpsa6b6a2c1.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5109x800_zpsa1553427.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5109x800_zpsa1553427.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5119x800_zps37918b8e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5119x800_zps37918b8e.jpg.html)

Also made a flywheel from some free machining bar stock.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5116x1024_zpsdf6350b2.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5116x1024_zpsdf6350b2.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5126x1024_zps69fd1f5f.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5126x1024_zps69fd1f5f.jpg.html)

Getting the clamping to work smoothly has required a lot of fiddling with the diameter and the flexing of the clamp ring.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5119x800_zps37918b8e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5119x800_zps37918b8e.jpg.html)

mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 18, 2014, 04:11:01 PM
I worked on the clutch yesterday, first I made a hex broach to form a 3/16 hex spline in some brass stock the end of the full end broach was reduced so that as the broach was pushed through I could part off the discs.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5129x800_zps1526de93.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5129x800_zps1526de93.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5130x800_zps5ccc7043.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5130x800_zps5ccc7043.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5131x800_zpscfa33dea.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5131x800_zpscfa33dea.jpg.html)

next a few thin plates of mild steel for the slip rings these were drilled first then parted off the steel discs are .630" x .020" thick the brass ones .345" x .030" thick. the steel discs with be fixed to the gearbox and the brass disc will be fixed to the prop shaft via the hex collar on the shaft the large collar will act as the pushing element

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5133x800_zps10f30319.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5133x800_zps10f30319.jpg.html)

test assembly

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5134x800_zps71c908a3.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5134x800_zps71c908a3.jpg.html)

Mike 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on December 20, 2014, 04:32:31 PM
That's some very neat work on the gearbox  :ThumbsUp:  :ThumbsUp:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 20, 2014, 05:35:34 PM
Roger thanks for your kind comment.

I am making the lever control now that the rest of the clutch parts are installed.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5137x800_zps749bb16a.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5137x800_zps749bb16a.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5141x800_zps648c613b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5141x800_zps648c613b.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5143x800_zps49583514.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5143x800_zps49583514.jpg.html)

Michael
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 21, 2014, 05:00:38 PM
Using a hardened button file guide to file the diameter and  bosses on the lever.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5149x800_zps30d05773.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5149x800_zps30d05773.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5150x800_zpsca200630.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5150x800_zpsca200630.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5154x1024_zps93452e1e.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5154x1024_zps93452e1e.jpg.html)

The top of the handle is filed because I was unsuccessful turning it in the four jaw chuck, it snagged on the tool and bent so after straightening it i cleaned it up with needle files and steel wool.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5155x800_zps08c3ab17.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5155x800_zps08c3ab17.jpg.html)

Two more links and then to test the clutch.

Mike 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: jschoenly on December 22, 2014, 02:18:19 PM
Just fantastic!  Really enjoying this build!
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 22, 2014, 05:37:14 PM
Jared thank you for your kind comment. I am new to this site so I have been rather randomly reading through some of the other builds I have to say I feel a bit like a novice looking at some of the stunning workmanship of some of the engines that are showcased here.

I am still fettling away with the operation of the gearbox and linkage, it does work which pleases me no end.

This first picture shows the lever in the reverse position and the swiveling collar is pulled back disengaging the spring and at the same time rotating the top lever of the band clamp.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5165x800_zps6ebd3c19.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5165x800_zps6ebd3c19.jpg.html)

Here the lever in the forward position the collar has engaged with the spring and clamped the clutch plates and has moved the clamp lever forward which spreads the band clamp and releases the gearbox.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5166x800_zpsb295fae1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5166x800_zpsb295fae1.jpg.html)

A couple of overall shots of the present state of the whole assembly.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5168x1024_zps98f2ff6f.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5168x1024_zps98f2ff6f.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5169x1024_zps14c76f05.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5169x1024_zps14c76f05.jpg.html)

I whipped up a quick propeller to enable the visual of the forward /reverse to be more easily seen in video.

Mike



Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on December 22, 2014, 06:50:22 PM
Mike nice save on the handle. Usually when I bend something in the lathe it is scrap.

That is really looking like the drawing link. I am looking forward to seeing the video of it in operation.

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on December 23, 2014, 01:10:33 AM
Great progress Mike!

I'm still following along and enjoying your work; the reversing gear is real nice and the family shot is just great!
It is amazing how tiny everything is and you don't realize it until there is a picture with your fingers in it. Thanks for taking the time to post your work here on MEM.

Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 24, 2014, 07:54:20 PM
Dan and Dave thanks for your kind remarks. I am starting to work on the meat of the engine now namely the pistons and con rods, having just read through all the posts on the high performance research work by Jim Allen, I feel a bit like a kid with some first crayons.

My goodness there is some phenomenal work being done with model engines.

Working at this small scale does have its own challenges, and the "Cut and Try" line suits me very nicely indeed. That said here is the progress on the pistons

I used the basic ideas used for the tiny engine by Putputman to design the piston. and made a small holding fixture to drill the wrist pin hole and to work on the inside of the piston, which I still need to do.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5178x800_zps45298fe2.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5178x800_zps45298fe2.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5177x800_zpse1cbde56.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5177x800_zpse1cbde56.jpg.html)


(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5170x800_zpsab1073f6.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5170x800_zpsab1073f6.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5171x800_zps06d7ae6a.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5171x800_zps06d7ae6a.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5175x800_zps73bc2d84.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5175x800_zps73bc2d84.jpg.html)

They seem to fit nicely enough and slide up and down smoothly, and since I am hoping to have this engine run slowly, they will probably work OK. the pistons are .311 in diameter and .372 high

Mike
 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: b.lindsey on December 25, 2014, 01:34:38 AM
Beautiful work Mike. That gearbox is a work of art as is the engine. I am really enjoying the build log.

Bill
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on December 31, 2014, 06:37:56 PM
A bit more progress on the engine I am now working on the con rods.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5201x800_zps4289a009.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5201x800_zps4289a009.jpg.html)

I ended up making a new set of pistons and reworking the inside shape  to fit the top end of the rods.

The clamping block worked out well enough.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5207x800_zpsc91089ea.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5207x800_zpsc91089ea.jpg.html)

The big end split using a slitting saw in the lathe ready for the split bushing

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5213x800_zps515479a1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5213x800_zps515479a1.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5219x800_zps849c2b88.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5219x800_zps849c2b88.jpg.html)

the first piston connected to the rod.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5227x800_zps375456d4.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5227x800_zps375456d4.jpg.html)

I turned up a steel pin that was a tight push fit and then used the lathe as a shaper, turned a small round nosed bit sideways and moved the carriage back and forth as the top end was incrementally turned by hand to shape the top end around the wrist pin hole.

The brass bolts are temporary just for the machine work.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 02, 2015, 04:59:05 AM
More work today on the con rods

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5259x800_zps269d418f.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5259x800_zps269d418f.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5269x800_zps23d39d7f.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5269x800_zps23d39d7f.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5274x800_zps64f28a4c.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5274x800_zps64f28a4c.jpg.html)

I used a hard button to guide the files for the bottom of the rod.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5275x800_zpsfe1c5f72.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5275x800_zpsfe1c5f72.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5280x800_zps9888ccfc.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5280x800_zps9888ccfc.jpg.html)

The upper crankcase was placed on backwards I noticed after uploading the pictures.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5290x800_zps58191b05.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5290x800_zps58191b05.jpg.html)

This is getting more fiddly by the day it seems.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on January 02, 2015, 05:32:43 PM
Very nice work Mike. I know what a file button is for but there is no after photo so we can see how it was used and how the con rod bolts fit the finished big end.

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 02, 2015, 06:16:56 PM
Dan thanks, I will be making the second bushing today and will take some pictures of the shaping of the bottom and of how I used the shape to lock the bottom end of the bolts.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: fumopuc on January 02, 2015, 07:07:53 PM
Hi Mike, it is always a pleasure to see any progress at this engine build.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 03, 2015, 06:17:18 AM
got to an important milestone today


Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on January 03, 2015, 03:51:50 PM
That looks real nice Mike!

Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Kim on January 03, 2015, 04:55:02 PM
Quite impressive, Mike!  And much smaller than I've been picturing, now that I see your fingers up next to it!
Kim
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Myrickman on January 04, 2015, 10:51:48 AM
I went through your entire build log this am....wow! The small scale of everything and the results of your efforts are impressive. The reversing gear and the tiny compression cocks are really works of functional art. I like all the hand shots for a true realization of the size.  I'll be following this more closely. Great job Mike.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: 90LX_Notch on January 04, 2015, 04:08:14 PM
Mike-

This is a very impressive build.  I love the gearbox; but, I love the engine even more.

-Bob
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on January 04, 2015, 07:27:06 PM
Looking good  :praise2:  :praise2: As the others have said having your hand in the picture shows just how small it all is  :ThumbsUp:  :ThumbsUp: (Unless you're a giant  ;) )
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 06, 2015, 05:31:38 PM
Thank you all for the kind comments.

I have had a few moments of difficulty with the cams, I read through a lot of threads on this and other forums about how to make the cams.
My first attempt was to make a pair for each cylinder, I turned up a blank on the lathe bored and pinned it to a 1/8th shaft of drill rod then transferred the chuck to the rotary table. I had drawn up a chart with the rotary table and marked off the degrees the first cam went well I flipped over the pair to cut the second cam and realized the old mirror problem and cut the second cam the same as the first.
in order to confirm I went to rotate the cam and grabbed the wrong handle

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5326x800_zps479eeab9.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5326x800_zps479eeab9.jpg.html)

and wound the work into the cutter chipping it and bending the shaft.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5327x800_zps662b3e93.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5327x800_zps662b3e93.jpg.html)

Costly  mistake, I usually remove the mill table wheels when doing rotary work, for just this very reason.

This episode caused me to reconsider the methods I was employing, I decided to make the cams using the lathe as a shaper. the first order was to add the indent device to lock the spindle using the 60 tooth main gear normally used for the back gearing on the Myford.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5343x800_zps8e91e18b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5343x800_zps8e91e18b.jpg.html)

I did a drawing showing the progressive cuts of the shaping bit. and the tooth number to index to.
as I progressed with the ever deeper cuts a I also marked the gear with a blue marker progressing down to the half way round the diameter of the tooth to the 14th tooth either side of the lobe apex each cut was gust under .001" and cut very nicely.

After this cut I rounded the tip a little more, to about a .01 radius

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5345x800_zps0dbf7b70.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5345x800_zps0dbf7b70.jpg.html)

the results are encouraging I only have about .008" to go before the final clean up and polishing

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5346x800_zpsbb1b0992.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5346x800_zpsbb1b0992.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5347x800_zps9673b033.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5347x800_zps9673b033.jpg.html)

The long cam form will get bored  and reamed to 1/8th then drilled for taper pins and then parted off and hardened finally slid onto the shaft and pinned once the locations are set.

Mike


 
 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on January 06, 2015, 07:08:34 PM
I have milled my camshafts in the opposite plane using a simple jig with a 60 tooth change gear as the divider. Maybe this reduces the chance of a crash  :headscratch:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 07, 2015, 12:47:16 AM
Roger I might have to make myself a set up similar to that for future work, what I would really like is good indexing head.

today I finished shaping the cam form and polished it with 600 then 1200 wet and dry.

the lift ended up being .02" instead of .022" I can live with that.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5352x800_zpsa857e4b2.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5352x800_zpsa857e4b2.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5356x800_zps9dbad8a8.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5356x800_zps9dbad8a8.jpg.html)

next I turned down to the root diameter for the area that will take the pins. This diameter is .156" and the width of the cam is .108" after the roots were turned I bored and reamed the length of the form to .125" and then parted it of.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5363x800_zps9c7e7f5b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5363x800_zps9c7e7f5b.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5370x800_zpsebd11242.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5370x800_zpsebd11242.jpg.html)

then slipped it onto a shaft of 1/8th drill rod the drill the pin holes, after the holes are drilled I will harden the cams before positioning them on the camshaft.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5373x800_zpsbcecc99d.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5373x800_zpsbcecc99d.jpg.html)

once the shaft is pinned to the sacrificial shaft I will use a fine parting tool to separate them keeping them on  a new piece of 1/8th drill rod for hardening.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 08, 2015, 07:13:14 AM
Whipped up a 75DP cutter for 30 tooth gear today

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5376x800_zps8932b388.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5376x800_zps8932b388.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5383x800_zps4af628f1.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5383x800_zps4af628f1.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5386x800_zps2c1cf3a0.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5386x800_zps2c1cf3a0.jpg.html)

The quick and dirty test confirms that the method will work, when I cut the gear for the engine I will need to set the cutter properly to the tangent and control the depth accurately.

Mike 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on January 08, 2015, 05:59:59 PM
Mike, Nice work on the cams. Did you use the gear cutter as a shaper in the lathe? It looks like the cutter is mounted in a quick change lathe tool holder.

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 08, 2015, 09:36:13 PM
Hi Dan, yes I did and it worked very well I think, I ended up grinding the cutter face both left and right so that I can hold it top or bottom of the piece being cut. I am going to do some work on the thumb adjusting screw on the quick change so that I can accurately adjust the depth of cut.

mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on January 11, 2015, 01:12:05 AM
I had to rethink the whole gear cutting sequence the headstock gear turned out to be 65 teeth, I am not sure why I came to think it was a 60 tooth gear, without actually counting the teeth.

I set up the rotary table vertically

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5394x800_zpsaaf284f6.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5394x800_zpsaaf284f6.jpg.html)

and worked the degrees I made the small gear first for the crankshaft.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5406x800_zps642874d4.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5406x800_zps642874d4.jpg.html)

then worked on the 60 tooth, I worked the mill in the same way as the lathe and shaped the teeth rather than cutting them rotating the bit I locked the quill and unplugged the mill and I am glad that I unplugged it because 2 or 3 time I went to turn it on or off. The other reason for not rotating the bit is because I do not have a way of holding it in a mill collet , and I will not use the drill chuck to mill with, but holding it in a fixed position was acceptable for my purpose.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5418x800_zps40b98878.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5418x800_zps40b98878.jpg.html)

it was slow but the finish on the teeth turned out really well, I did 2 or 3 finish cut without adjusting anything on each tooth.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5419x800_zpse9d9e113.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5419x800_zpse9d9e113.jpg.html)

back to the lathe for final shaping.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5427x800_zps422d65cb.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5427x800_zps422d65cb.jpg.html)

well it is not finished yet I still need to turn the eccentric for the waterpump.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5429x1024_zps0eb88b2a.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5429x1024_zps0eb88b2a.jpg.html)

I am pleased with the 75DP gears and the mesh though.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5430x1024_zps28fef5c2.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5430x1024_zps28fef5c2.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5431x1024_zps8d0d8ef0.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5431x1024_zps8d0d8ef0.jpg.html)

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on January 11, 2015, 01:22:24 AM
Beautiful work Mike!

You make it look so easy.

Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: 90LX_Notch on January 11, 2015, 01:38:39 AM
Mike-

I can't wait for this build to be completed.  It really is a cool build.

-Bob
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Don1966 on January 11, 2015, 02:09:56 AM
Those gears turned out great Mike. You do some awesome work.

Don
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: fumopuc on January 11, 2015, 05:32:46 AM
A really beautiful work Mike. Very impressive.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on January 11, 2015, 07:49:12 AM
Great work on the gears  :ThumbsUp:  :ThumbsUp:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on March 22, 2015, 11:40:12 PM
Thank you all for your kind remarks, I have been busy with the engine but had a short interruption due to some family sickness which is all OK now.

I worked on the waterpump and associated piping, I made some special pipe benders out of some 1/4 inch diameter rod. the pipes were annealed then filled with some styrene bent then the styrene was burnt out, it worked like a charm.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5478x800_zpsnzwogbzl.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5478x800_zpsnzwogbzl.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5487x800_zpsm8qwjlpz.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5487x800_zpsm8qwjlpz.jpg.html)

the union required some tricky threading for which I made a 6x80 tap to do the internal threading the male threads were done on the Myford.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5493x1024_zps4qoyqi2f.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5493x1024_zps4qoyqi2f.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5503x800_zpsma816uqt.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5503x800_zpsma816uqt.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5502x800_zps8zbzxqgb.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5502x800_zps8zbzxqgb.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5495x800_zps2wsbpjfn.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5495x800_zps2wsbpjfn.jpg.html)

next task was the spark plugs these are quite small the corian core was sliced off the edge of a small cutting board.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5597x800_zpsmrngdn4z.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5597x800_zpsmrngdn4z.jpg.html)

Turned down to .078" and bored out to .028" for the music wire electrode.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5602x800_zpss89ucrf7.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5602x800_zpss89ucrf7.jpg.html)

The body was made from an annealed allen key and is threaded 6x40

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5671x800_zps22gfpvix.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5671x800_zps22gfpvix.jpg.html)


The cover plate and circular top plates were fitted and the small 00x90 machine screws were completed next, the screws were remachined from some 00x90 hex head because the commercial round head ones were too large in diameter.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5698x800_zpscpeypgyr.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5698x800_zpscpeypgyr.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5721x800_zps6xv3ar7s.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5721x800_zps6xv3ar7s.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5739x800_zpsjlvipefi.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5739x800_zpsjlvipefi.jpg.html)

To bring it all up to date I am working on the waterpump excentric, I made some filing sleeves to shape the excentric body and next it will need the arm silver soldered to it.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5734x800_zpsgjh7imna.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5734x800_zpsgjh7imna.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5740x800_zpscdt8zpby.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5740x800_zpscdt8zpby.jpg.html)


(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5741x800_zpsbfwcavca.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5741x800_zpsbfwcavca.jpg.html)
That is where I am at to date.

Mike

 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: tvoght on March 22, 2015, 11:47:47 PM
It's good to see an update on this little beauty, Mike.

--Tim

Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on March 23, 2015, 12:28:16 AM
Impressive work Mike!

Thanks for the update and it is nice to seem some progress on the Buffalo.


Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: peatoluser on March 23, 2015, 10:23:13 AM
yes, some very impressive machining indeed!
particularly liked the home made tap
following along with interest

peter
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: 90LX_Notch on March 23, 2015, 11:18:36 AM
Mike-

I was recently wondering what had happened to this project.  Glad to hear that the family illness is OK.  I understand how that disrupts things.  Excellent update and progress.

-Bob
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on March 26, 2015, 04:50:48 PM
Thanks for the kind remarks, I am having to use the library computer because our internet service is not working at the moment.

I have done some more work on the engine including adding the waterpump body, it is attached with 00x90 bolts.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5756x800_zpse10peu0b.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5756x800_zpse10peu0b.jpg.html)

and have finally sorted out how to hold the top of the head onto the cylinders.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5758x800_zpsomngrpwk.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5758x800_zpsomngrpwk.jpg.html)

Made a small wrench for the tiny spark plugs out of some drill rod using and Allen key as a form

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5760x800_zps2uqhislj.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5760x800_zps2uqhislj.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5764x800_zps7iajnwpd.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5764x800_zps7iajnwpd.jpg.html)

the overall configuration of the pump body seems ok.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5767x800_zpsbiqpbwny.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5767x800_zpsbiqpbwny.jpg.html)

I started to work on the valves and the water jacket needed to be relieved for the .100" diameter springs.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5772x800_zpsssqg2xxh.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5772x800_zpsssqg2xxh.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5774x800_zps6ylyxkq4.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5774x800_zps6ylyxkq4.jpg.html)

The valves are turned from 1/8th drill rod. and I have also turned the blank for the valve seat cutter.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5777x800_zps1ywlrs6x.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5777x800_zps1ywlrs6x.jpg.html)

Mike 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dan Rowe on March 27, 2015, 01:38:46 AM
Wow Mike that is some small machine work. Very nice stuff.

Dan
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on March 27, 2015, 08:13:48 PM
Hi dan
Thanks, just got my internet back, and it is a bit faster now as well.

mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: b.lindsey on March 27, 2015, 09:14:48 PM
That's some beautiful work Mike, its nice to see progress on this one.

Bill
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 02, 2015, 03:18:26 PM
Thanks for the nice remarks.
I have reworked the valves and followed the practice of making the body of the valve a handle for the lapping.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5811x800_zpscpi1mdmx.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5811x800_zpscpi1mdmx.jpg.html)

I burnished the cone area with some watchmaking burnishing tools.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5813x800_zps6jxkddac.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5813x800_zps6jxkddac.jpg.html)

then I used the flywheel as a weight and as a way to spin the valve while adding some jewelers rouge to polish the seats.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5817x800_zpslxg24nxy.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5817x800_zpslxg24nxy.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5815x800_zpspflievek.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5815x800_zpspflievek.jpg.html)

then parted off the valves

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5819x800_zps0v263nte.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5819x800_zps0v263nte.jpg.html)

did a clean up on the heads of the valves

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5822x800_zps5rvc25ch.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5822x800_zps5rvc25ch.jpg.html)

ready now to make the lifters.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5823x800_zpswbursd0m.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5823x800_zpswbursd0m.jpg.html)

Once I get the lifters done I will set up the cams which still need to be fully separated from each other then set and pinned to the camshaft.

Mike

 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Don1966 on April 02, 2015, 07:24:12 PM
Mike I have to agree with what everone else is saying and that's a beauty. Very nice work bud. I like....................... :praise2:

Don
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: fumopuc on April 03, 2015, 06:39:22 AM
Hi Mike, I am still following along quietly. It is always impressive to follow your construction progress.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 05, 2015, 08:19:12 PM
Thanks for the kind words.

A little more work on the engine, the lifters are .093 diameter with a 0x80 adjustable cap and lock nut, I used a .9mm hole through the bottom as a way to hold the lifter while locking the nut. had to rework the size of the hex with a file it is .080" across the flats.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5856x800_zpsnlp4hk67.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5856x800_zpsnlp4hk67.jpg.html)

The cams were fixed with a taper pin the hole size was a  Number 73 drill.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5863x1024_zpswhrraijs.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5863x1024_zpswhrraijs.jpg.html)

The taper reamer setting the hole taper.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5867x800_zpsbfyofslu.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5867x800_zpsbfyofslu.jpg.html)

All the lifters in place with a .002 thou clearance

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5868x1024_zps1ny4gqxt.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5868x1024_zps1ny4gqxt.jpg.html)

And a video of the valves moving

Mike

Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 08, 2015, 03:54:22 PM
I have started on the inlet manifold, after reading all the material about the vapor carburetors I think this will be the way I will go on this tiny engine. I can hide the tank under the floorboards of the boat and just come up through the scale carb which will act as the air inlet.

The tube was annealed then filled with some .093 styrene then bent around some 1/2 inch rod.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5875x800_zpsezxiketd.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5875x800_zpsezxiketd.jpg.html)

The flanges were turned on the lathe then shaped and drilled on the mill before parting off.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5876x800_zpsvvtukifk.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5876x800_zpsvvtukifk.jpg.html)

I reground the tip of the 1x72 tap to make it flat to cut these very short threads for the threaded studs and used the thumb disc to do the tapping.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5879x800_zps91hha4tw.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5879x800_zps91hha4tw.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5880x800_zpsaxm4ulmz.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5880x800_zpsaxm4ulmz.jpg.html)

The studs were made from music wire, the stud on the right needs to be shortened , I made the small diameter nuts from some softened 3/32 Allen key.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5883x800_zpsmcnfkkvx.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5883x800_zpsmcnfkkvx.jpg.html)

to be continued.

mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: peatoluser on April 08, 2015, 04:56:44 PM
your workmanship is so good , that I keep forgetting how small this engine is, until something in the photo reminds me.
excellent work. like the idea of using an allen key for hex material.
yours
peter
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: BronxFigs on April 09, 2015, 12:21:41 PM
Beautiful workmanship, concept, photos, etc, etc!


Frank
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: vascon2196 on April 09, 2015, 04:10:04 PM
Holy smokes!

That is one miniature engine!

Great job...love to see it running.
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: stevehuckss396 on April 09, 2015, 04:55:44 PM
I have no idea how i missed tbis one. You can bet ill be checking in on you alot more often. Great job!
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 10, 2015, 03:03:37 PM
Thanks for the support and for checking out my little engine. I did have to remake the inlet manifold to make it a little shorter to raise the bottom of the loop, so I ended up making new flanges as well. the brass drop to the carb is threaded 6x80

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5894x1024_zpscsteplt5.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5894x1024_zpscsteplt5.jpg.html)

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Don1966 on April 10, 2015, 03:19:13 PM
Mike that's awesome bud and I like.......................... :praise2:



 :drinking-41:

Don
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on April 11, 2015, 01:20:08 AM
Aw-sum work Mike!

Can't wait to see that little tiny Schebler Carburetor hanging from that nice little intake manifold :Lol:.

Still quietly following along with this amazing project.

Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 12, 2015, 01:26:17 AM
Thanks again for the kind feedback.
Today I received a great photo from Roger showing me the real configuration of the manifold. i spent most of the morning learning how to bend eve tighter loops in the tubing.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5916x800_zpsyzqisiqr.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5916x800_zpsyzqisiqr.jpg.html)

After some time I got it pretty close.

My first go at the new shape looked pretty good

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5920x800_zps1jfxnt5u.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5920x800_zps1jfxnt5u.jpg.html)

So I went for some lunch and ruminated over it, and redid the bottom part and added the new threaded end. Yesterday I made a #5x 64 tap which I used for the threads in the end ready for the carb.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5931x1024_zpsyvbomaph.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5931x1024_zpsyvbomaph.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5929x1024_zps8zebar2s.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5929x1024_zps8zebar2s.jpg.html)

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5930x1024_zps5xvcfs9q.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5930x1024_zps5xvcfs9q.jpg.html)

Now I can get on with the carb.

Mike 
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: 90LX_Notch on April 12, 2015, 01:55:52 AM
Mike-

The manifold came out awesome.  This build continues to be inspiring.

-Bob
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Art K on April 13, 2015, 01:22:41 AM
Mike,
I had seen your early posts but missed a lot. Read everything and got caught up, very good work and ingenious ways to make some seriously small parts. Can't wait to hear it run!
Art
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: b.lindsey on April 13, 2015, 02:17:49 AM
I am just catching up again Mike...really nice work and the manifold came out great!!

Bill
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 16, 2015, 01:06:03 AM
Thanks again for the kind comments.
Dave here is the start of the carb.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5937x1024_zpsddgma6cr.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5937x1024_zpsddgma6cr.jpg.html)

The nut on the connection to the manifold will act like a lock nut so that when the carb is wound in then the nut can lock it in the vertical position/

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5941x800_zpsannbexw5.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5941x800_zpsannbexw5.jpg.html)

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Myrickman on April 16, 2015, 01:10:45 AM
Mike, is that a cute little Schebler carb I spy hanging off that manifold? Very nice work...still following along. Paul
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 16, 2015, 01:16:43 AM
Paul yes it is there are a few bits to add yet, the fuel vapor will flow through the carb from the vapor tank right below under the floor boards, I am hoping to use the carb as the air mix, but I might have to do it differently. and add the air at the tank.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Dave Otto on April 16, 2015, 01:28:09 AM
Nice work Mike,

Yes the baby Schebler is looking good!

Enjoying your progress,
Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: steamer on April 16, 2015, 01:58:35 AM
That's beautiful Work Mike!  :praise2:

Dave
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Graham G on April 16, 2015, 04:08:31 AM
 :NotWorthy::o beautiful, I just love the copious quantities of brass and copper.
Graham  :praise2:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Roger B on April 16, 2015, 07:36:56 AM
Still following along and enjoying  :ThumbsUp:  :ThumbsUp: Splendid work  :praise2:  :praise2:
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on April 17, 2015, 09:01:24 PM
Dave Otto, Dave (steamer), Graham, Roger, thank you for you kind comments, it really means a lot coming from such accomplished builders.

the Carb needed to be rebuilt because I was not happy about a couple of things.

The adjusting screw was "knurled" by slipping the screw into a piece of 3/32 brass tube and lining up the edge of a file and rolling the file along the head pressing down to form the ridges.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5956x1024_zpsfferdktk.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5956x1024_zpsfferdktk.jpg.html)

A pencil to give it some scale.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5952x1024_zpswsdft9dw.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5952x1024_zpswsdft9dw.jpg.html)

I also added a proper flange to mount the carb to the manifold, it still needs a little shaping and the throttle lever added.

(http://i5.photobucket.com/albums/y169/my30mm/buffalo%203hp%20model%20engine/IMG_5957x1024_zpsjfp998w2.jpg) (http://s5.photobucket.com/user/my30mm/media/buffalo%203hp%20model%20engine/IMG_5957x1024_zpsjfp998w2.jpg.html)

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: 90LX_Notch on April 18, 2015, 02:27:37 AM
I knew it was small but the pencil really drives it home Mike.  Just awesome.  Very impressive build.

-Bob
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on July 11, 2019, 08:14:24 PM
Just though I should let you all know that I am stalled on this model at the moment. I is close by and will resume at some point. currently I am working on a small steam loco, a 45mm gauge coal fired model of an 18 inch gauge Beyer peacock Shunting loco, but don't want it to look like a model loco with oversized fittings which is proving to be a challenge.

Mike
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: Admiral_dk on July 11, 2019, 09:31:42 PM
Did you "just find something more interesting"  ;) ...?...  in that case I'm sure many others here know the feeling  :-[

I probably shouldn't make anymore comments about this as a thought about glasshouses and stones comes into mind  :old:

The next question - are there any pictures of the new build ?

Best wishes

Per
Title: Re: 1 eight scale 3HP buffalo marine twin
Post by: mike mott on July 11, 2019, 09:51:43 PM
I still want to finish this engine but it is just on the back burner for now.
I started a thread in Vehicles.

Mike