Modeler's Corner

Vintage Stirling,Caterpillar

| August 2006

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    Ken Hollenbeck’s Stirling vintage model.
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  • 08-06-039-Mayo-1.jpg
    The Caterpillar model doing what it does best: pushing dirt.
  • 08-06-039-Hollenbeck-1.jpg
    Ken Hollenbeck’s Stirling vintage model.
  • 08-06-039-Mayo-2.jpg
    The Cat after its first painting.
  • 08-06-039-Mayo-3.jpg
    The Vintage Machinery Club’s youngest member, Dallas, with the Cat.

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  • 08-06-039-Model-Corner.jpg
  • 08-06-039-Mayo-1.jpg
  • 08-06-039-Hollenbeck-1.jpg
  • 08-06-039-Mayo-2.jpg
  • 08-06-039-Mayo-3.jpg

Stirling

This is my tank-cooled version of a vintage Stirling cycle engine from drawings by Jerry Howell.

Some modifications from the original drawings include threading the connecting rods and their mating ends 0-80 UNF to make assembly and adjustment easier. I also threaded the crankshaft pin for the same reason.

To facilitate machining the hot cap from stainless steel, I opted to bore clear through vice, making a blind bore. I then fabricated a head for the hot cap and secured it with six 0-80 UNF Allen head screws. (Tapping 0-80 in stainless is an exercise in patience!)

The heat-retaining shield over the hot cap is my own design. It helps the engine run smoothly with a minimum size flame from the oil can alcohol burner.



This was a fun project built entirely on my old Atlas 10F lathe; no rotary table, no collets and no milling machine, only a milling attachment on the lathe. I machined the main body hexagon shape from round stock using a hex machine nut for indexing to obtain the desired 60-degree angles.

Just goes to prove that you don't necessarily need all the latest and greatest equipment to complete an interesting project.

MGraves
7/24/2014 11:22:06 AM

It is quite fascinating to see that the Bulldozer was powered by 2 mobility scooter motors! Great post, very interesting.