Author Topic: Bijou. Something for the small guys.  (Read 15475 times)

Offline Dean W

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Re: Bijou. Something for the small guys.
« Reply #15 on: July 23, 2012, 07:49:01 PM »
'

Here is the finish of this little project.  I will have a video up a few hours later.





This piece will be a jig for drilling the port face holes, and the inlet hole in the cylinder.  A .020" drill
is being use here, (1/2 mm).  I'm doing this on the milling machine, as it has a very true spindle.  The spindle on the
average drill press has too much runout to drill such a small hole, and the bit would be broken in a second.








I also made up an alignment pin with a threaded end.  These two jigs are used to accurately drill the ports
in the engine.  The plate attaches to the crankshaft, and as the crank is rotated the plate will mimic the
arc traveled  by the cylinder when the engine is running.  The tiny hole will be used as a guide for drilling
the needed holes in the port face.  The pin does the same thing for the hole that needs to go in the cylinder face.







This is how the jig mounts to the port face of the engine.  This may not be very interesting in itself, but
I wanted to show how one of these jigs works. A similarly made jig in larger scale will work perfectly for
aligning the steam ports for most any other oscillating engine. 

If you were to need to fab a new port block for an engine, or say you soldered over the holes in an existing
port block, one of these can make your work in locating the holes not only easy, but very accurate.







What you need to know is the distance between the steam inlet in your cylinder and the pivot screw.  Using a thin
piece of sheet steel, drill a hole in one end the same size as your port.  Carefully measure from the center of
that hole and lay off the center of position for your pivot screw, and drill a hole the same size as that screw.
Finally, cut a slot in your jig piece.  Take care to keep your two holes and the slot all in a straight line.
The length of the slot is not critical, as long as it allows you to mount the jig to your intended port face and
slip the slotted part over the crank pin on the crank shaft.  Make the slot long enough to allow the flywheel/crank
to rotate through a full rotation.  Also, make the slot just wide enough to let the crank pin enter it.  It needs
to be a close fit.

When you get ready to drill your holes in the port face, mount the jig to the face using the pivot screw for
the cylinder, or another screw of the same size.  In the pic above, I've used a hex head screw through the jig
and through the pivot hole on the engine port block.

The slot is placed over the crank pin as shown above.  I had to make a small bushing for this one, as the jig is
used for two different drilling operations.  The bushing is needed to remove any slop between the pin and the slot.

Finally, the crankshaft is rotated, watching the jig travel through its arc.  At the extreme points of the arc
on each side of the crank pin rotation, the top tiny hole is used as a guide for drilling the ports.

Hope that made some sense.  Easier to do than to say/type.








This pic shows how well the jig works.  Holes perfectly spaced.
I use this kind of jig for most all of my wobbler engine builds.  Just makes things easier, and gets it done
in one go.







The same jig is used to put the single hole in the cylinder, but this time with an additional pin jig that
holds the cylinder bore perfectly in line with the crankshaft bore.

Two more holes are drilled in the port block, one for the inlet and one for the exhaust, then all the parts
can be assembled. 







You can see how small the engine really is in this shot.







That's it, done.

Thank you all for your interest and nice comments.  Video coming in a few hours.

DW
Dean
In beautiful N. Idaho, U.S.A.

Shop Projects:
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Offline lazylathe

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Re: Bijou. Something for the small guys.
« Reply #16 on: July 23, 2012, 07:55:21 PM »
Hi Dean,

Great update!
I had to cheat a bit to see what the final result was...
When you said it was by Senft i thought it may be a small Stirling engine, but i was wrong... :hammerbash:

It is a small beauty though!!!


Andrew
A new place to hide my swarf!

Offline dsquire

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Re: Bijou. Something for the small guys.
« Reply #17 on: July 23, 2012, 07:57:46 PM »
Dean

I still want to buy the mold that makes those super sized M&M's. Haha.

Cheers  :cheers:

Don
Good, better, best.
Never let it rest,
'til your good is better,
and your better best

Offline ksouers

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Re: Bijou. Something for the small guys.
« Reply #18 on: July 23, 2012, 10:21:55 PM »
Congratulations Dean.

Can't wait to see the video! Hurry up   :thewhip:     ;)


I didn't realize just how tiny that thing is!  WOW! 


Kevin

Offline zeeprogrammer

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Re: Bijou. Something for the small guys.
« Reply #19 on: July 24, 2012, 01:24:45 AM »
Very cool. I do like seeing jigs too.

Hey! It's been hours! Get with it!

BTW - thans for the pic of mini-Z. It was good to see him.
BTW - did you get my email?
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Dean W

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Re: Bijou. Something for the small guys.
« Reply #20 on: July 24, 2012, 01:44:29 AM »
'

Zee, yes, I got your email from Saturday.  Just haven't made a reply for you yet.  I will, buddy!

Okay fellers, here's the vid of Bijou on air.  I have one of it on steam, too.  Will get that one up another time.

Thank you all again for your nice remarks!


<a href="http://www.youtube.com/watch?v=0IiQDesJb3s" target="_blank">http://www.youtube.com/watch?v=0IiQDesJb3s</a>
Dean
In beautiful N. Idaho, U.S.A.

Shop Projects:
http://www.deansphotographica.com/machining/projects/projects.html

Offline zeeprogrammer

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Re: Bijou. Something for the small guys.
« Reply #21 on: July 24, 2012, 01:53:23 AM »
 :whoohoo:

Man that is small. And you say you have it running on steam?! Looking very much forward to seeing that!
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline swilliams

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Re: Bijou. Something for the small guys.
« Reply #22 on: July 24, 2012, 03:02:46 AM »
very nice Dean. Sure must add to the challenge being so small

Steve

Offline ksouers

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Re: Bijou. Something for the small guys.
« Reply #23 on: July 24, 2012, 03:14:24 AM »
Very cool, Dean!

Runs real good, too. Sounds like a bunch of hornets :)

What'd you use for air line? Wire insulation?

 :cheers:


Kevin

Offline arnoldb

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Re: Bijou. Something for the small guys.
« Reply #24 on: July 24, 2012, 04:08:17 PM »
Well done indeed Dean  :NotWorthy:

I've had my eye on this engine as well - but have been too chicken to try it so far!

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

Offline Dean W

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Re: Bijou. Something for the small guys.
« Reply #25 on: July 24, 2012, 11:26:38 PM »
'

Thanks for the comments, folks. 
I hadn't put this build on the other engine forum, so thought it would be a good "introductory" build from me
on MEM.  It will fit on any lathe, and I know some of the guys use small machines like Sherline and Taig.  I have
a Taig, and I do like small projects that will fit on it, although I do have a larger metal lathe, too.
It is a fun build, and it encourages a guy to hold the line on tolerances a bit, so it's good practice.  Also, even
if you screw up every part in it, you're only out about $2 in materials..   :Lol:


What'd you use for air line? Wire insulation?
Kevin
Kevin, I used the small air tube that comes with Dust Off canned air. 

Arnold, build one!  Strap on your magnifying visor, and go to it.  :)
Very simple engine, just not very big.


Okay, here is the video of it running on steam.  Please note, I did this vid for a toy live steam forum
that I visit, which is why I reference the little Mamod Minor 1 in the vid.
The boiler I'm using is from an old toy steamer.  They pop off at about 15 psi.  I don't know how much
pressure the Bijou is running on here, but less than 15 psi.
I had put too much steam oil in the little engine, so you see a lot of white muck on the engine base.
The white stuff is steam oil and water mixed after it came out of the engine exhaust.  The engine has
a case of the hiccups at the start of the vid as it tries to get rid of the excess steam oil.
Part of the "buzzing" sound is the engine itself, and part of it is the vibration on the wood plank.


<a href="http://www.youtube.com/watch?v=a0wqAqWQ0Hc" target="_blank">http://www.youtube.com/watch?v=a0wqAqWQ0Hc</a>
Dean
In beautiful N. Idaho, U.S.A.

Shop Projects:
http://www.deansphotographica.com/machining/projects/projects.html

Offline NickG

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Re: Bijou. Something for the small guys.
« Reply #26 on: July 25, 2012, 07:13:35 PM »
That's brilliant Dean! Can't believe how small it is! Like the jig, that's what most people struggle with on wobblers.
Nick

Offline 90LX_Notch

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Re: Bijou. Something for the small guys.
« Reply #27 on: July 25, 2012, 07:26:07 PM »
Dean,

That is sweet.   :ThumbsUp:  I love the real little ones.

Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline zeeprogrammer

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Re: Bijou. Something for the small guys.
« Reply #28 on: July 26, 2012, 12:33:38 AM »
Very cool Dean.
I wouldn't have believed it...should have known better.

Looking forward to your next project!
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline doubletop

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Re: Bijou. Something for the small guys.
« Reply #29 on: July 26, 2012, 11:11:58 AM »
Dean

That's wonderful and encourages me to do something I've had in mind for a while. The LBSC style mechanical lubricator is very similar in size and design to your Bijou. I've the innards of one in my junk box and have been meaning to make a small flywheel for it and see if it would run as wobbler. Clearly it could.

Something for one of those slow days.

Thanks for showing us

Pete
?To achieve anything in this game, you must be prepared to dabble on the boundary of disaster.? - Stirling Moss