12-Apr-2005
Starting the Cyclinder machining. The first step was to establish a reference surface. We decided that this would be the inner mating surface. The surface was cleaned up and brought to dimension. It was detrimined later that this dimension was too large and we re-machined after the cyclinders were bored.
Of the 10 holes, 6 were drilled to the through size for a 10-32 screw, and the 4 marked holes were drilled and reamed for 3/16. A fixture plate was made to hold 4 matching 3/16 pins and bolted to an angle plate. This fixture was used throughout the cyclinder machining process, and also for holding the Valve Guides and Rear Cyclinder Covers (the bosses for the Crosshead Guides) square.
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