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 43
ure 29 the distanceAB is, of course, 1% inches, and is the radius of the angleA B C of 30°; then B C is the secant, and in the table ofsecants we find that the secant of 30° is 1.154+, which, multi-plied by the radius and doubled, or by the diameter, thus,1.154 X 3.5 = 4.039 inches, the diameter… … THE MACHINIST AND TOOL MAKERS INSTRUCTOR. 39 other words, to find the diameter across the corners of anysize of hexagon (six sides), multiply the secant of 30° by thediameter across the short side (or flat). Or, if you have a round piece of steel and want to knowhow large a hexagon you can mill on…
Machinery
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