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Adjustable tool for lathes

A lathe turning tool in a drill rod is adjusted by a differential screw. When turning the red nut, it is advanced and the tool is retracted simultaneously. The resultant displacement of the tool is very small, (t2 – t1) mm in 1 rev. of the nut.

t2: pitch of the nut external thread. t1: pitch of the nut internal thread. The threads are right hand.

The tool is clamped by a setscrew after adjusting.

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