Author Topic: Rocker V Stirling Engine  (Read 2386 times)

Offline Ian S C

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Re: Rocker V Stirling Engine
« Reply #30 on: October 11, 2017, 03:48:08 AM »
You could drop an e-mail to Andy Ross in the states, he's been there and done that as far as coatings and anodizing of cylinders and pistons.
I just keep away from aluminium on these parts, and try to stick to cast iron for both bore and piston, although if the size is right I use the tube from inside a shock absorber, because this is round, parallel, and highly polished.
Ian S C

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #31 on: October 11, 2017, 08:13:29 PM »
Thank you for the input Pete. I'm aware or this fact, actually I had to specify the thickness of the oxide layer (in micrometers :o) to the company who is doing this. So I think this will be done quite accurately. And also for this reason I will fit the piston to the cylinder, so it doesn't really matter if the bore is a little bit smaller.

Ian, I was in touch with  Andy Ross. He provided the articles he wrote about these engines.

Plani

Offline 10KPete

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Re: Rocker V Stirling Engine
« Reply #32 on: October 11, 2017, 10:48:36 PM »
 :ThumbsUp: :ThumbsUp:

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

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #33 on: October 24, 2017, 02:23:00 PM »
This time I made the ring to which the hot cap will be soldered later.

Some mild steel was faced and drilled:


The hole was then opened up, including the step for the hot cap:


Then the other side was faced and the diameter turned as well as a groove for the O-ring:


Finally the part was taken to the mill to drill the holes for the bolts:


Done:


Plani

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #34 on: November 04, 2017, 04:24:09 PM »

Just a very brief update. That's what the cylinder looks like hard coat anodized. I actually think, it looks ok.


Plani

Online b.lindsey

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Re: Rocker V Stirling Engine
« Reply #35 on: November 04, 2017, 05:01:49 PM »
Looks cert good to me plani. Did you have it done commercially?

Bill

Online crueby

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Re: Rocker V Stirling Engine
« Reply #36 on: November 04, 2017, 05:27:44 PM »
That looks fantastic. Does the anodizing hold up on the interior of the cylinder okay? (is that the 'hard coat' part of the name? )

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #37 on: November 05, 2017, 08:43:58 AM »
Bill, as far as I know there are some nasty chemicals involved in this process as well as very high electrical currents. Therefore I had the anodizing done by a specalized company.

crueby, time will tell....although I'm optimistic since half of the aluminum oxide layer grows into the surface and the other half is added on top of the surface. So this should hold up quite well. But we will see once the engine is running...

Plani

Offline yogi

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Re: Rocker V Stirling Engine
« Reply #38 on: November 05, 2017, 09:10:23 PM »
Beautiful looking part Plani!!!  :ThumbsUp: :ThumbsUp: :ThumbsUp: