Some photos of progress on the Trevithick Dredger engine. I am still making components for the engine, which is a single cylinder, double acting steam engine. The valves and throttle are cylindrical, which is the method used by Trevithick over 200 years ago.
After preliminary drilling and reaming, the block was sawn to produce the truncated cylindrical hole. (any better suggestions to describe the shape?)
The steam chest will contain the cylindrical valves for throttle and steam opening-closing and direction. A complex item. Quite a few hours of nutting out and machining. Not quite finished.