A screw cutting lathe is a machine specifically a lathe capable of cutting very accurate screw threads via single point screw cutting which is the process of guiding the linear motion of the tool bit in a precisely known ratio to the rotating motion of the workpiece. Its first use for screwcutting was nothing short of a revolutionary step for by using a train of gears to connect the lathe spindle to a long screw running along the length of the bed and the screw to the lathe carriage the latter together with its cutting tool could be forced to move a set distance for every revolution of the spindle . Gearing of lathes for screwcutting is aimed specifically at the engineer for use in the workshop it is intended to take away as much as possible of the mathematics and mystique from calculating gear ratios so that the more enjoyable work of using your lathe to make things becomes as easy as possible. Gearing of lathes for screwcutting hardback book by brian wood a very comprehensive hardback book packed with illustrations how to guides dedicated to the practice of gearing on lathes for screw cutting
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