Author Topic: Ultra Tiny (1/4 scale Tiny)  (Read 18040 times)

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #45 on: February 05, 2017, 01:07:57 AM »
We're good Bill.  It's assembled.  I retrieved my compressor. 

The hard line from the pump to the distribution tee ruptured due to ice.  That's fixed.  The compressor still works.  Tomorrow I plan to try to run it.  If it runs you'll hear the "hooray" down in NC.  Heck, Jo will hear it across the pond.

What drives me nuts is that it did run.  I never changed anything.

-Bob
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Offline zeeprogrammer

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #46 on: February 05, 2017, 02:04:57 AM »
What drives me nuts is that it did run.  I never changed anything.

That happens so often to me at work. What? It works now? But I didn't do anything.

Usually it means you did. Might be the same steps. But a different order.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Zee-Another Thread Trasher.

Offline PStechPaul

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #47 on: February 05, 2017, 10:47:59 AM »
I had never heard of the term "Dutchman" for a round shaft key. I found this:
http://www.practicalmachinist.com/vb/general-archive/round-keys-keyways-will-work-89082/index2.html

I guess I just don't have a good sense of how small this thing is. The close-up images make it look bigger than it is. So the only other things I can think of are (1) shrink the hole in the flywheel by peening it so the shaft is a press fit, (2) expand the diameter of the shaft by mechanical means or plating, (3) making the shaft and the flywheel from an easily soldered material like copper or brass.

Good luck. It's an amazing piece of micro-machining!

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #48 on: February 05, 2017, 01:28:22 PM »
No joy.

"This time I used the Loctite on the flywheel.  I hope I got it right because that will be a real PIA to undo. " 

That was my prophetic statement of the day.  The crank is locked up.  It's soaking in acetone right now.  So far, a one hour soak has had no effect on the Loctite.  If that doesn't work I'll try the soldering iron next.


Paul- I've considered a press fit but am afraid of bending the crank.  I do have a mechanical idea that should solve the whole flywheel problem.  The only problem would be that it strays from Elmer's original design.  When I set out to do this thing the idea was to make it as close to possible to Elmer's drawing.

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

Offline b.lindsey

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #49 on: February 05, 2017, 02:00:42 PM »
Well darn Bob. Heat should loosen the Loctite but the issue then is holding such small parts to pull them apart. It can still take some force to do so and trying not to scar up the parts in the process of getting them apart is the issue I have had when doing so. Hang in there though, you will beat it yet!!

Bill

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #50 on: February 05, 2017, 03:59:52 PM »
Success in getting it apart! 

The flywheel is now blue, but it is off.  The crank was a pain.  Too much of a heat sink present with the column, but I stayed at it.  There's a nice burn on my finger but it is well worth it if I don't have to remake any parts.  I still have to check the crank and make sure it didn't get "tweaked".

I'm going to take a little break from it for now.  I need to machine something and have some type of success.

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

Offline mklotz

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #51 on: February 05, 2017, 05:11:35 PM »
And, for your next act, you're going to build a 1/4 scale model of this...


We'll be waiting anxiously.
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Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #52 on: February 05, 2017, 06:07:37 PM »
Touche' Marv.

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

Offline ShopShoe

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #53 on: February 06, 2017, 02:19:40 PM »
Chuckle, Chuckle,

But Marv, I wanted to see him build the little tiny wheel puller.

ShopShoe

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #54 on: February 06, 2017, 04:24:42 PM »
That would have been "a walk in the park" ShopShoe.

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

Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #55 on: February 07, 2017, 05:47:02 PM »
And the journey ends....

It runs once again.  Hopefully it stays running this time.  I shot some video, but I don't know how it turned out.  Now I have to find the correct cable to upload to YouTube, so it might be a day or two.

Picture one is it sitting still.
Picture two shows the blur of the crank while it is running.
Picture three is it next to a standard USB cable connector.  I hope that it might be a universal size indicator.
Picture four is for Marv.  I made sure to have the engine in the same plane as the stone.  The earlier M&M picture never really gave an accurate size indication because the engine was forward of the M&M due to to the parent stock (3/8 bar).  This caused the engine to look bigger then it actually is.

I would like to thank the members of MEM for their support.

-Bob
Proud Member of MEM

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

Offline b.lindsey

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #56 on: February 07, 2017, 05:51:22 PM »
Awesome Bob. Glad you got the problems sorted out and fixed, hopefully for good as you say :)  Now to find a place to keep it where it won't get "lost"  :pinkelephant:

Bill

Offline mklotz

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #57 on: February 07, 2017, 05:59:38 PM »
"Picture four is for Marv"

What, did you think I doubted how small it is?  I didn't but the picture is still a good one.  Next picture of a miniature I take I'll have to use my Brass Rat as a size reference.  I normally use a penny because they're exactly 0.75" diameter.

Villanova, huh?  I always heard good things about it up in the intellectual tundra of Allentown but never visited the campus.  In what did you major there? 
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Offline 90LX_Notch

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #58 on: February 07, 2017, 06:22:11 PM »
Bill- Thanks.

Marv-I never doubted that you understood the size.  When you mentioned that you had seen a ring size engine it gave me the idea to pull out my ring.  Even I was shocked when I realized that it could fit under the stone.  I just thought it would make a neat picture.

I majored in Geography with a concentration in Urban.  At that time, I was interested in becoming either a Phd or an urban planner.  I wound up working in Quality for a 2nd tier defense contractor when I left grad school.  The rest is history.  The higher education opened the door into management; but, it was the two years of metal shop and two of auto shop in high school that set my career on it's way.

-Bob
Proud Member of MEM

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

Offline 10KPete

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Re: Ultra Tiny (1/4 scale Tiny)
« Reply #59 on: February 07, 2017, 06:35:07 PM »
That is a most amazing little engine. Well done!!   :ThumbsUp: :ThumbsUp:

Pete
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SB 10K lathe, Benchmaster mill. And stuff.