Engines > Your Own Design

Bellcrank Beta Stirling Engine Project

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crueby:
Seems like there must be some sort of goop that would be good at heat transfer that could be used to fill any small gaps?

tvoght:
Yes the goop is used for heatsinks in electronics, often with a mica sheet in between when electrical isolation is needed. Fortunately I wouldn't need a micah insulator here. --Tim

Dave Otto:

--- Quote from: crueby on March 23, 2025, 06:32:52 PM ---Seems like there must be some sort of goop that would be good at heat transfer that could be used to fill any small gaps?

--- End quote ---

That is what I was thinking, heat transfer compound used for electronics. When I assemble my Essex engine for the final time, that is what I'm planning to use on the interface of the water jacket and cold end, this is a flat to flat interface. The other option might be to do a shrink fit which would give better contact with the CI Liner.

Dave

Jasonb:
will the 3D print go down small enough for the diameter of the pins? most have a minimum thickness though they usually flag that up as soon as you upload the file. To hold the print just make up two half round nesting jaws, wood would do.

I've just had a part done in 316L stainless and that bored out to final size OK.

Also on your laser cut standards I would allow a bit of extra metal to square up the bottom foot and bore to take your bearings.

tvoght:
HI Jason. Pcbway specs a minimum wall thickness of 1mm, so I made the pins .04 inches diameter. Close, but still over 1mm. I did submit a file to see what the cost would be and it was accepted by the automated system. It still could be rejected by a human if I placed an order...
Thanks much for the advice on the feet of the standards.


My devious plan to submit a near-finished design for review is working! <rubbing hands gleefully>.
--Tim

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