The watchmakers' lathe, its use and abuse; a story of the lathe in its various forms, past and present, its construction and proper uses (1903)
Goodrich, Ward L. [from old catalog] · Chicago, Hazlitt & Walker · leaf 151
cutting qualities of thetool. The rake of the tool shown in Fig. 119 is positive,the angle of the cutting edge being acute, while that of thetool in Fig. 121 is negative, this angle being obtuse. A toolin which the top face is straight, that is, level with the centerof the lathe, is spoken of as… … Fig. 119. the top face of the tool is not that alone due to the actualsevering of the metal, but also that of bending the metalafter it has been severed. This strain, of course, varies withthe depth of cut and the amount of rake given to the tool.The greater the rake the less this strain is. The…
Clocks and watches · Lathes
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