The engine parts were in forgings and needed only to be machined.
It is ductile, is not affected by immersion in sea-water, and can be machined.
Three hundred of these malleable castings are machined in nine hours.
The difficulty apparently was the result of the sprockets being cast and not machined.
The part to be turned is a hub casting for an automobile and it is machined in two series of operations.
The part to be machined is held to the table B either by clamps or in chuck jaws attached to the table.
Work that is to be turned or bored should first be set so that the part to be machined is about central with the table.
It can then be machined with comparative ease and be subsequently hardened or tempered.
Valve stem guides and valve stems must be machined very accurately to insure correct action.
The cam-shafts shown at Figs. 133 and 134, B, are of the latter type, as the cams are machined integrally.