Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 201
mandril are transmittedto the lead screw in any ratio by means of interchangeabletoothed wheels called change-wheels. A complete set ofthese wheels, as supplied with a screw-cuttmg lathe, consistsof 23, rangmg from 20 to 120 teeth per wheel, increasing byfives, with duplicates of the 20 and 40… … Fig. 169. usual to suppty a wheel with 127 teeth which can be usedin adapting the speed to the cuttmg of metric threads. Most screw-cutting lathes are now fitted with a gap-bed LATHES AND LATHE^WORK 185
Metal-work
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