e of thevalve to proper radii. The operation is located from thevalve stem diameter, which is held in an ordinary chuck.After the head is formed in this rough forming opera-tion, the heads are given center marks for locating thefinish grinding and machining work on the stems. Thecentering… … 1—Cutting off stock to length e In. longer than finished valve stem. Stock is .010 in. diameter larger than finishedstem. 2—Drilling the cast Iron valve heads on a special machine which drills six at a time. 3—Cleaning out counter-sinks In the valve head casting. 4—Welding valve stems to valve…
Automobiles · Aeronautics
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