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 44
hat Figure31 was to be 3 ins.across the flat side,then 1.082 X 3= 3.246 inchesacross cornersetc.; or, sup-pose that wehave a roundpiece of stockand we want tomill it to theshape of an octa-gon. Then mul-tiply the cosine of22^° = .9239,bythediameter of the stock,and the result is the diam-eter… … 40 THE MACHINIST AND TOOL MAKERS INSTRUCTOR.
Machinery
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