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 76
a full set now consists of tenchucks having steps ranging two-tenths of a millimeterapart from 50 to 228. In order to get sufficient bearing onthe back of each step to properly chuck the wheel, the stepson each chuck are ten sizes apart. Thus the first step onchuck No. 1 is 50; the second is 70,… … Fig. 48. until we reach 68, on No. 10. Returning, we repeat thesteps on the next round, and so on until we reach 228 on thelast step of the last chuck. In this way we secure 90 stepson ten chucks, while giving a proper bearing to each. In step chucks the important points are that the stepsshall be…
Clocks and watches · Lathes
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