The machinist and tool maker's instructor, containing an easy method of calculating and laying out difficult work in the machine shop .. (1896)
Genung, Edward. [from old catalog] · New York [Press of J. B. Savage, Cleveland] · leaf 185
rcumference and length, as in figure 44, should always beat right angles to each other. A spiral mill 2>4 diameter is large enough for ordinarywork and should have from 22 to 24 teeth, and should havea spiral of about one turn in 36. A cutter of this size andnumber of teeth will have about Yz… … THE MACHINIST AND TOOL MAKERS INSTRUCTOR. 181 cause there will be more stock around the hole. If you wanta good spiral mill for roughing purposes (that is, one that willcut fast), after the size has been finished in the lathe, takean ordinary cutting off tool, about one-eighth of an inch wide,with…
Machinery
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