Author Topic: Roy Ozouf's Coventry  (Read 19446 times)

Offline Admiral_dk

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Re: Roy Ozouf's Coventry
« Reply #75 on: December 13, 2016, 07:35:16 PM »
Well the most important thing is that you have discovered the reason why + we can't be talking about much in wasted material either  ;)

Will be looking forward to a nice video of it running as it should  :popcorn:

Offline kvom

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Re: Roy Ozouf's Coventry
« Reply #76 on: December 13, 2016, 08:21:22 PM »
CNC carving valve from some .780" round bronze bar.



Test fit with the valve nut:



Bottom cavity after trimming to thickness on the manual mill:



Then the magic happens.


This was running on 50+ pounds of air with leaks, and it hesitates at TDC, so the timing is still off.

Offline 10KPete

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Re: Roy Ozouf's Coventry
« Reply #77 on: December 13, 2016, 08:26:51 PM »
Well, it runs! Still stiff and a big leak somewhere but it runs!! :whoohoo: :cartwheel:

Congratulations!!

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline vcutajar

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Re: Roy Ozouf's Coventry
« Reply #78 on: December 13, 2016, 09:46:34 PM »
Congratulations.  In my book that's a runner.  Now the fine tuning begins.

Vince

Online Tennessee Whiskey

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Re: Roy Ozouf's Coventry
« Reply #79 on: December 14, 2016, 01:19:58 AM »
Well, it runs! Still stiff and a big leak somewhere but it runs!! :whoohoo: :cartwheel:

Congratulations!!

Pete
Hell Pete,  that sounds like me.  Great job Kirk.  You'll get it loosened up.

Cletus

Offline 10KPete

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Re: Roy Ozouf's Coventry
« Reply #80 on: December 13, 2016, 11:24:47 PM »
Well, it runs! Still stiff and a big leak somewhere but it runs!! :whoohoo: :cartwheel:

Congratulations!!

Pete
Hell Pete,  that sounds like me.  Great job Kirk.  You'll get it loosened up.

Cletus

 :lolb: :lolb:

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline Dave Otto

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Re: Roy Ozouf's Coventry
« Reply #81 on: December 14, 2016, 12:01:37 AM »
Congrats on a runner Kirk!


Dave

Offline crueby

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Re: Roy Ozouf's Coventry
« Reply #82 on: December 14, 2016, 12:14:10 AM »
That is a very mesmerizing motion - love it!

Online b.lindsey

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Re: Roy Ozouf's Coventry
« Reply #83 on: December 14, 2016, 03:51:44 AM »
Fantastic Kirk...just down to some fine tuning now. Love it!!!

Bill

Offline sshire

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Re: Roy Ozouf's Coventry
« Reply #84 on: December 14, 2016, 03:27:17 PM »
Excellent!
I loosened mine up by running it on the lathe for about 20 minutes. I did find that setting the timing was much easier with an acrylic steam chest cover. It was to be temporary and then the brass cover would replace it. However, seeing yet another moving part was too interesting so the clear cover remains in place.
Best,
Stan

Offline fumopuc

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Re: Roy Ozouf's Coventry
« Reply #85 on: December 14, 2016, 09:38:37 PM »
Hi Kirk, congratulations, a nice runner.
Kind Regards
Achim

Offline Kim

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Re: Roy Ozouf's Coventry
« Reply #86 on: December 15, 2016, 03:43:42 AM »
Congratulations on a beautiful runner!  I love all that moving stuff!   :)
Kim

Offline Flyboy Jim

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Re: Roy Ozouf's Coventry
« Reply #87 on: December 15, 2016, 03:47:37 PM »
I'm with others............I love the motion. Nice work.

Jim
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Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline kvom

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Re: Roy Ozouf's Coventry
« Reply #88 on: December 16, 2016, 09:33:10 PM »
Went to refine the timing and discovered that there was slack in the valve linkage.  I took the engine apart to discover that the hole in the eccentric strap used for connecting the sliding link had wallowed out into an oval shape.  This essentially meant that there was lost motion in both directions of the eccentric.

Since I had made the eccentric to fit the strap, I thought it worthwhile to try to save the strap itself rather than remake another.  What I came up is to cut off the arm of the strap, drill and tap a hole in the head, and mount a new arm. 

The cross section of the arm is 1/4" square.  Having only a 1/2" square collet and some matching steel bar, I elected to start with these planning to mill the arm to final dimension.  Here's the intermediate steps, using 8-32 threads:



Screwed together with red thread locker:



Once the thread locker cures a bit I'll start machining it down to size.

Offline philjoe5

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Re: Roy Ozouf's Coventry
« Reply #89 on: December 16, 2016, 10:26:02 PM »
Good runner and nice to watch.  Congratulations :ThumbsUp:

Cheers,
Phil
If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.  - Mark Twain