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 223
h less. When very accurate index plates are needed these notchesare made with one side radial and the other slanting about20 degrees, as shown in the index plate on the testing ma-chine (Fig. 202). This style of slot assures the greatest THE AMERICAN EATIIE. possible accuracy, because when the… … Fig. 201, Rivett lathe arranged for wheel cutting. against the index finger. Should a chip get between theangular side and the index finger it would not impair theaccuracy of the divisions. This form of slot has anothergreat advantage in that the wear is confined to the slantingside of the notch…
Clocks and watches · Lathes
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