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 127
), with a bevelprotractor, or what is better, a piece of thin sheet steel for atemplate, as shown at B C D of 75° placed at one of thesepoints; we find in the table (that follows) for 40 teeth, J^/7pitch, the number 4 ; this means 4/20 of an inch, and is forthe face of the teeth; then with the… … ■<- \JE/ 75 For the flank, or inside of the same tooth, we move theinstrument one pitch, whatever it may be; in this case it isy% to the left, as shown, and in the table for the flanks ofteeth we find the number 7 for 40 teeth y%f pitch, and we nowmeasure off 7/20 to the left of the corner, and…
Machinery
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