Engines > Your Own Design
Bellcrank Beta Stirling Engine Project
tvoght:
Next on my list of things to make is the gudgeon insert for the piston.
I'll attach a drawing and rendering to show what I'm up to.
--Tim
tvoght:
I clamped a piece of 1" brass stock in the Bridgeport vise and side-milled the end.
In a series of steps I cut away to leave a raised portion that will become the
gudgeon pin pivot flanges. Between cuts I aligned with previous cuts using
an adjustable parallel and square.
I attempted to round over the top of the flange section using the DRO's arc function. The results were not the best, but can be cleaned well with a file.
The slots for the two arms of the connecting rod were sawed with a slitting saw.It is a 1/16" slot and the saw is .032 thick, so each slot took 2 passes.
I simply cut the part off of the stock with my bandsaw leaving just enough for cleanup on the flat face. Virtually no waste of brass here. The stock goes back in the brass box.
Here I've clamped it on the width of the flange block and milled the bottom plate to thickness and also drilled for the relief of the displacer rod gland.
I drilled the holes to pass the 4-40 screws that will attach the gudgeon piece to the piston proper.
I need to mill away the center portion now for which I have made witness marks with the saw.
With no good place left to clamp, I whipped up a fixture so that the piece can be attached via its mounting screws, then clamped and milled away.
I test fit the piece in the piston. The steel countersunk screws are temporary. These are planned to be brass.
Thanks for looking in,
--Tim
Admiral_dk:
Great description on how you approach each Part :ThumbsUp:
+ a fine result :ThumbsUp: :ThumbsUp:
Per :cheers:
tvoght:
--- Quote from: Admiral_dk on May 24, 2025, 05:59:10 pm ---Great description on how you approach each Part :ThumbsUp:
+ a fine result :ThumbsUp: :ThumbsUp:
Per :cheers:
--- End quote ---
Thank you Per. I probably spent more time laying awake thinking about possible operation sequences than I did in the machining. --Tim
tvoght:
Next up is the displacer shell. Drawing and rendering attached.
--Tim
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version