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Part 5 – Cylinder video is available

February 12, 2016

In this video I machine the Cylinder, and there were a number of challenges. The bore needs to be accurate so that the piston isn’t too tight or too loose. Both end faces need to be parallel as well as perpendicular to the bore. The valve face needs to be flat, smooth, and perpendicular to the bore for the engine to run smoothly.

The most interesting part was the steam passages from the valve face to the ends of the cylinder. The drawings that came with the castings simply show that the holes need to be drilled. In the book they specify the angle as 25° but don’t explain how they arrived at that number. In the video I explain in detail how I determined the correct angle for these passages.

The angle blocks that I used when setting up to drill the steam passages are available from

From → Steam Engines

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