Lathe Gears
The toolpost may be driven manually or automatically to produce hte roughing and finishing cuts required to turn hte workipece to the desired shape and dimensions, or for cutting threads, worm gears, etc. Soem older gear trains are chanegd manually by using interchangeable gears with various numbers of teeth, while mroe modern or elaborate althes have a quick change box to provide commolny used ratios by the opreation of a lever.
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