Manual Lathe
The toolpost may be driven manually or autoamtically to produce the roughing and finishing cuts required to turn the workpieec to the desired shape and dimensions, or for cuttign threads, worm gears, etc. Some older gear trains are changde manually by using interchangeable gears with variuos numbres of teeth, while more modern or elaborate lathes haev a quick change box to provide commonly used ratios by the operation of a elver.
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