Work on this engine started some time ago (more than 15 years) and I had only had made the piston as a trial when I had no other projects underway.
After a 15 year rest and being inspired by this forum, I once again commenced work on the project.
All work is now being carried out on the following equipment
Hercus ATM 260 lathe ( ex school lathe) ( No milling attachment)
Waldown Drill press probably post war era with large 4" machine vise
Drive plate for lathe with many 6mm holes for mounting (I dont yet own a faceplate)
Home made vernier height gauge
Home made Tailstick dieholder
Home made centre finder
Vice, hand tools and files
This engine is based on drawings in an old book, "The Steam Engine" by Robert Scott Burn published in London in 1854, and published in live steam magazine in October 1977, by Robert S Hedin.
The engine is unusual in that it has one piston rotating and oscillating in a rectangular cylinder. The engine comprises 4 conrods, several links
and a sliding rod valve inside a housing. Most parts are brass with the baseplate made from 1/4" aluminium. Piston is steel and Special screws are made from Stainless steel.
Here is shown the baseplate simply cut with a hacksaw from a flat Aluminium plate.
The base was then squared in the lathe, mounting holes were marked then holes drilled in the drill press.
In the background is the piston with exhaust openings and also a number of brass spacers.