Corbin Dunn
Redwood Monkey

Coffee Cup Stirling Engine

Machining

Over winter break I started on a project I’ve been wanting to do for a long time. A coffee cup stirling engine, made from scratch based on plans from Jan Ridders.

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It “almost works”. The bearings seem to be too big, and the shaft has a lot of slop. I had machined the shaft to the side I thought the bearings were going to be (3mm), but they are larger! I need to remake that part and see if it works.

Some work in progress shots. Power piston (graphite), cylinder (brass), crank shaft (steel), flywheel (alum), stand (alum in brass).

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Several tries to get these right:

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Flycutting stuff and testing the displacer fit in the groove.

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Making the flywheel:

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