Author Topic: Eames Train Brakes - Official Work Thread  (Read 95721 times)

Alan Downey

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Re: Eames Train Brakes - Official Work Thread
« Reply #180 on: June 27, 2019, 11:41:58 PM »
Thanks for the heads up. It's fixed now.
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Dave Crow

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Re: Eames Train Brakes - Official Work Thread
« Reply #181 on: June 28, 2019, 08:42:25 AM »
Excellent work, as always, by you and your dad!

Jeff Schumaker

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Re: Eames Train Brakes - Official Work Thread
« Reply #182 on: June 28, 2019, 09:13:03 AM »
It's amazing what can be done with 3D printing.

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Rick Knight

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Re: Eames Train Brakes - Official Work Thread
« Reply #183 on: June 28, 2019, 02:57:37 PM »
Truly amazing work.

Bernie Perch

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Re: Eames Train Brakes - Official Work Thread
« Reply #184 on: June 28, 2019, 05:31:46 PM »
You guys are taking this to a mind bogglingly higher level.  I am in awe.

Bernie
« Last Edit: June 29, 2019, 06:24:09 AM by Bernie Perch »

Steve Smith

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Re: Eames Train Brakes - Official Work Thread
« Reply #185 on: June 28, 2019, 11:23:59 PM »
All photos fine now. Marvelous work! Thank you, Alan

ALAIN DELASSUS

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Re: Eames Train Brakes - Official Work Thread
« Reply #186 on: June 29, 2019, 08:13:44 AM »
I'm wowed . You and your father are as much excellent to work wood as metal You are both artists and I'have learned quite a lot about casting through those pics and comments. I think it's a real chance for the WW&F to have guys like you.

Joe Fox

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Re: Eames Train Brakes - Official Work Thread
« Reply #187 on: June 30, 2019, 06:09:46 AM »
Very impressive. For those who may not know how air brakes or in this case vacuum brakes work, these controllers can be extremely tedious work. Job well done to everyone involved and I look forward to seeing the finished product.

Paul Uhland

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Re: Eames Train Brakes - Official Work Thread
« Reply #188 on: August 16, 2019, 06:24:04 PM »
Astonishingly impressive!!
Cannot wait for more pics!
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Keith Taylor

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Re: Eames Train Brakes - Official Work Thread
« Reply #189 on: January 13, 2020, 03:25:35 PM »
Some photos showing brake controller patterns followed by some images showing what is involved with set up and machining.
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Keith Taylor

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Re: Eames Train Brakes - Official Work Thread
« Reply #190 on: January 13, 2020, 03:26:32 PM »
Second photo

Keith Taylor

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Re: Eames Train Brakes - Official Work Thread
« Reply #191 on: January 13, 2020, 03:27:11 PM »
3rd photo

Keith Taylor

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Re: Eames Train Brakes - Official Work Thread
« Reply #192 on: January 13, 2020, 03:41:36 PM »
Center drilling the radial holes.

Ed Lecuyer

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Re: Eames Train Brakes - Official Work Thread
« Reply #193 on: January 01, 2021, 10:28:49 AM »
2020 SUCKED!
(But in this case, in a GOOD way)

Here are two videos of the 12-30-2020 vacuum test of the finished controller. I'll let Jonathan and/or Jason comment on the results.

https://youtu.be/VWXj-X0cHpY

https://youtu.be/57rnfUaJS3E
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Jason M Lamontagne

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Re: Eames Train Brakes - Official Work Thread
« Reply #194 on: January 01, 2021, 10:59:38 AM »
We are absolutely ECSTATIC with this test.  This is the 5th month of controller testing- with this round we have solved its biggest problem and inadvertently improved another feature many times over.  First- we’ve achieved the full range of vacuum: 0-21 in Hg.  We’d previously only achieved 16 in Hg.

 In doing so, we also reduced the automatic vacuum maintenance hysteresis to a remarkably fabulous less-than 0.5 in Hg swing.  (Our calculations predicted this, however when we were only achieving a hysteresis of 2 in Hg we figured it was unexplained mechanical loss and accepted it.  Turns out the cause was the same as our loss of total range.)

The controller has only a few minor touch up items remaining- the fast-application valve needs to be resprung, and the steam valve seal needs to be reworked.  The quadrant needs travel limit stops and detents, and the valve will then get one final set of internal adjustments.

Please note this controller is based on US Patent 241,334, issued to Fred Eames in 1881.  We used his basic design: a diaphragm which compares vacuum level to a compression spring- however we did make several improvements to improve functionality, sensitive component protection, and compactness.

We are now proceeding fully on construction of two prototype “bellows cylinders,” based directly on US patent 228741.

Tickled pink with this controller, we are!!

Happy New Year,
Jason
« Last Edit: January 01, 2021, 11:01:50 AM by Jason M Lamontagne »