Author Topic: Ultra Tiny (1/4 scale Tiny)  (Read 18054 times)

Offline 90LX_Notch

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Ultra Tiny (1/4 scale Tiny)
« on: April 12, 2015, 09:02:50 PM »
This is Elmer's Tiny done at 1/4 scale.  I'm calling it "Ultra Tiny".

Bore:  .046  (1.16)
Stroke:  .046  (1.16)
Column height: .312  (7.94)
Ports: .013  (.33)
Center Distance of ports .023  (.58)
Crank Pin .016  (.41)
Fly Wheel Dia. .156  (3.96)

This thing has driven me crazy for years.  I would walk away from it some times for over a year. It finally runs.  I should make a new cylinder for it because the one on it has some blemishes; but, I'm going to leave it for now.



-Bob

Edit 1/21/17- Added family picture of parts due to failure analysis from CF 2017.
6/3/18 added YouTube video from the repair.
« Last Edit: June 04, 2018, 12:17:29 AM by 90LX_Notch »
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Offline b.lindsey

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #1 on: April 12, 2015, 09:21:50 PM »
Having seen it in person this weekend Bob, I know how amazing (and tiny) it is. Looking forward to the video. The pictures are great but don't do it justice!!

Bill

Offline Don1966

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #2 on: April 12, 2015, 09:53:53 PM »
Awesome Bob and I wish you would of had it running at the show. That is truly amazing little engine and did I say tiny....................... :praise2: I will be waiting for the video.

Don

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #3 on: April 13, 2015, 12:08:11 AM »
Thanks Bill and Don.  I just can't get the video to load up to YouTube.  I've been trying off and on for hours.  It just won't go.  Our ISP always runs slow on Sundays.  I think I'll call quits for now and try tomorrow.

-Bob
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Offline crueby

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #4 on: April 13, 2015, 12:10:48 AM »
Holy gnats knees, that thing is small! How did you tell what was swarf and what was the part you were making? Wow. Cant wait for the video - must sound like a hummingbird.

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #5 on: April 13, 2015, 03:07:46 AM »
Chris-

There were a lot of Boo-Boos with this one as well as a lot of lost pieces.  You are right with the hummingbird analogy; that or a pesky bug, which is more like it for me.  I have a love hate relationship with this one.

-Bob
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Offline PStechPaul

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #6 on: April 13, 2015, 04:41:21 AM »
That is an amazingly tiny engine! Sorry I missed it in my video of Cabin Fever. There was a lot going on there. It was good to meet you!

Offline sshire

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #7 on: April 13, 2015, 11:20:12 AM »
Bob
Amazing! Fantastic machining. You should get endorsement money from Bausch and Lomb. "Bob uses a Magnavisor...."
Best,
Stan

Offline sshire

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #8 on: April 13, 2015, 11:20:22 AM »
Bob
Amazing! Fantastic machining. You should get endorsement money from Bausch and Lomb. "Bob uses a Magnavisor...."
Best,
Stan

Offline cwelkie

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #9 on: April 13, 2015, 02:32:44 PM »
I can certainly understand the "love/hate" relationship you'd have with this project!  At least the hard part is over and you can now bask in the success of your accomplishments.  Well Done!

Online mike mott

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #10 on: April 13, 2015, 06:21:39 PM »
Bob I thought I was a bit crazy tackling my small engine,! You sir are amazing, are you intending to provide the world with some detailed pictures of the parts and or a drawing.
When I read .046 bore  and .046 stroke my jaw fell so far that I bumped the keyboard with my chin.

I love it when the bar gets raised, you put it pretty high up there.

Mike 
If you can imagine it you can build it

Offline Roger B

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #11 on: April 13, 2015, 07:27:42 PM »
Magnificent work   :praise2:   :praise2:

In the last edition of Maschinen im Modellbau there was a modeller who made a series of 12 twin cylinder oscillating engines (1.1mm bore 1.2mm stroke) all of which fitted in a thimble. One was assembled with a boiler, the baseplate is about 30mm square (one matchstick by one matchstick).

http://www.vth.de/maschinen-im-modellbau/21016-bau-einer-mini-dampfanlage/

The link is in German but I hope the picture comes through.
Best regards

Roger

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #12 on: April 14, 2015, 02:09:12 AM »
Paul- No problem.  I think you came over when there were a few people asking about it.  I'm sorry I didn't get to talk to you about your tach.

Stan- Thanks.  I did use a Bausch and Lomb handheld magnifing glass that I bought at Rite Aid.

cwelkie- Thanks.

Mike- Thank you.  Your's is amazing; it's i.c. this is only compressed air.  The plans are Elmer's Tiny.  The John-Tom site has them.  I just multiplied everything by .25 to scale it down.  It's a pretty faithful scaled down model from his original.  I didn't use a coil spring because I couldn't find wire that small.  I also didn't cross drill the .016 pivot for a retaining pin.  I have just a few pictures that I'll post.  I usually don't take many build pictures because I don't get a lot of shop time with three young kids, so when I do, I try make parts.  I didn't raise the bar.  There are other real small engines out there.  That's why I didn't title the video "Worlds Smallest...."  I think I can say it's one of the smallest, but not the smallest.

Roger- Thanks.  Wow, you just have to love micro engines.  That guy is real good.
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Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #13 on: April 14, 2015, 02:11:51 AM »
Some more pictures.
« Last Edit: April 14, 2015, 02:16:34 AM by 90LX_Notch »
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Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #14 on: April 14, 2015, 02:15:26 AM »
Some early pictures. None of these parts made it the final engine.  These were done on a Chinese Mini Lathe and Mill. 
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