-larly useful in the tool room has been brought outby the Precision and Thread Grinder Mfg. Co. It isknown as a multi-graduated precision grinder andclamps upon the top of the lathe tool rest. It is made intwo models, one for lathes equipped with back tool restand the other for ordinary lathes. The… … The same concern also manufactures a i)recisionthread lead variator which is claimed to make it possibleto obtain a precision lead from the ordinary lathe leadscrew, and to elongate the lead on parts which are sub-sequently to be hardened, to compensate for shrinkage.This eliminates correction…
Automobiles · Aeronautics
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