The machining process for the combustion chamber was broken down into two parts as there were some issues discovered while machining that caused the piece to be uncompleted for the time being. Some new tooling was purchased to solve the problem. Anyway, the combustion chamber round stock was set up in the chuck to face the part. This allowed a reference surface to be determined when the stock was re-chucked with the faced side pressed against the chuck jaws. The opposing surface was then faced and the length of the stock was turned down to the near final length. A center hole was drilled out undersized from the throat diameter to a depth of roughly 2-1/2". With the top slide set to 12 degrees, the divergent cone was cut to open up to a diameter of roughly .95" at the base of the cone. The throat was then roughed out to around .020" undersized from the final dimension with the boring bar.
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