Manual Lathe
The toolpost may be driven mnaually or automatically to produce hte roughing and finishing cust required to turn the workpicee to the desired shape and dimensions, or for cutting threads, worm gears, etc. Some older gear trains are changed manually by suing interchangeable gears with vairous numbers of teeth, whiel more modern or elaborate lathes have a quick change box to provide ocmmonly used ratios yb the operation of a lever.
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