Author Topic: AOG’s version of Elmer’s number 5 geared engine  (Read 3256 times)

Offline AOG

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AOG’s version of Elmer’s number 5 geared engine
« on: April 01, 2019, 02:30:15 AM »


This is one I have been wanting to make for a while. I remember reading Arnold’s build of this engine a few years ago. At the time I wasn’t up to the task but I think I’m ready. This is especially true because I’m cheating. I bought the gears premade.



Let’s get started. First up is the base. The blank was milled to size and mounting holes were drilled and counterbored from the bottom.



Then I milled the flywheel slot into the base. That took a month of Sundays. In hind sight I should have chain drilled the perimeter of the slot and cleaned it up with a mill.



Then the part was laid flat and I ran my shell mill over to top to clean it up.



That’s as far as I got this weekend. Till next time.

Tony


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Online Kim

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #1 on: April 01, 2019, 05:07:10 AM »
That's going to be a fun little engine, Tony!  :popcorn: :popcorn:
Kim

Offline Xldevil

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #2 on: April 01, 2019, 06:11:59 AM »
Interesting engine.
Where did you get the gears?
Cheers,Ralph


Offline AOG

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #3 on: April 01, 2019, 02:00:36 PM »
Interesting engine.
Where did you get the gears?
Cheers,Ralph

Would you believe Amazon? They have a few week lead time but they are available.

Tony

Offline b.lindsey

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #4 on: April 01, 2019, 02:37:24 PM »
I always liked this one, never made it but will definitely be following along Tony. Great choice!!

Bill

Offline bent

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #5 on: April 01, 2019, 04:23:17 PM »
That's not cheating, that's bowing to reality. Boston has been making gears a long time, and I've never made one.  I'd have to need something special before I'd go to the trouble of buying gear cutting tools.

This engine is on my someday list too, Tony.  Will be watching with interest. :popcorn:

Offline crueby

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #6 on: April 01, 2019, 04:26:13 PM »
Gear cutters are handy things, but they would not make the internal tooth gears like you bought - anyone here ever make internal toothed gears? Wondering how they could be done...
Anyway, will be watching along, that is a very slick engine.

Offline Dreeves

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #7 on: April 02, 2019, 02:29:39 AM »
Those are some pricey gears. I had the engine mostly complete before I looked for the gears. Wow sticker shock.  Great looking progress.  Looking forward to seeing it run

Dave

Offline john mills

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #8 on: April 02, 2019, 03:08:01 AM »
the internal gear can be made on a gear shaper the cutter has a small number of teeth to fit in side it is like a pinion and is geared to give the right number of teeth like a pinion meshing with the inside teeth both rotate together as the cutter backs off from the cut returns to the top of the stroke then advances to cutting depth cutting on the way down .The one i used was made by Tos it was the same as fellows .it fed to depth in the first 1/4 turn did a complete turn then backed off and stopped ready for the next gear.the one i used was only small would cut about 6" dia gears  but it was quick 700  800 strokes a minute not taking long to cut a gear.I never had to cut an internal gear but the tools were there.it would cut right up to a shoulder  into a narrow grove like 1/32" 

Offline Xldevil

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #9 on: April 02, 2019, 09:20:06 AM »
Those are some pricey gears. I had the engine mostly complete before I looked for the gears. Wow sticker shock.  Great looking progress.  Looking forward to seeing it run

Dave

Less pricey German source

https://www.maedler.de/product/1643/1618/innenzahnkraenze-modul-05-bis-2

https://www.maedler.de/product/1643/1618/stirnzahnraeder-gerade-verzahnt
« Last Edit: April 02, 2019, 09:23:43 AM by Xldevil »

Offline AOG

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #10 on: April 08, 2019, 01:57:17 AM »
I didn’t get much work done this weekend so I’m his will be a short update. I worked on one of the bearing pillars. I squared up the blank an milled it to length. Then I drilled and tapped the mounting holes.



Then with it still square I drilled the hole that eventually will take the bearing bronze.



The sides were milled close to the lines.



The end was faceted for rounding over.



The part was taken to the final shape on the belt sander.



That’s it for this weekend.

Till next time

Tony


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Offline b.lindsey

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #11 on: April 08, 2019, 02:53:23 PM »
Coming along Tony, nice progress!

Bill

Offline AOG

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AOG’s version of Elmer’s number 5 geared engine
« Reply #12 on: April 15, 2019, 02:40:39 AM »
This weekend has been three steps forward and two steps back. The fist thing I did was to make the large standard that will eventually hold the large gear. I squared up a blank and then drilled and tapped the mounting feet.



The part was flipped on it’s side and the bearing hole and the gear mounting holes were drilled. I deviated from the plans here. The plans call for 3-48 fasteners on the gear. I couldn’t find any so I am substituting 2-56 and drilled the holes accordingly.



The next change I made was to the shape. I liked what Arnold did on his so I roughly emulated his shape. First I notched the top in preparation for rounding over.



Then I milled down the sides close to the marked out dimensions.



The last bit of machining was to facet the top in preparation for rounding on the belt sander.



Then it was over to the belt sander to take the edges to the lines and round over the top. Here is a family shot taken after sanding.



Next up was to make the bearings. I turned the bronze to size and parted off two bearings.



I pressed the bearings into the standards. When the loctite cured I drilled and reamed the holes in the bearings.



That’s where I ran into problems. Somewhere along the way the drill drifted and I was left with this.



I pressed out the failed bearings and next week I will try again.

Till next time.

Tony


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« Last Edit: April 15, 2019, 02:57:15 AM by AOG »

Offline AOG

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #13 on: April 24, 2019, 02:52:57 AM »
I had a little shop time this weekend so I worked on the cylinder stand. First I squared up the blank and drilled the mounting holes.



The part was flipped onto its side and the decorative center hole drilled out and reamed.



Next I milled out the waste stock on the sides.



The part was turned bottom side up and trimmed to length.



That left me with the following.



After some quality time with my files, here is the final result.



Till next time

Tony


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Offline b.lindsey

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Re: AOG’s version of Elmer’s number 5 geared engine
« Reply #14 on: April 24, 2019, 02:12:39 PM »
Bummer about the bearings Tony, but the cylinder stand turned out quite well.

Bill