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 216
n 60X3.1416=188.5, and 188.5X45, the force at the end of the lever, =8482.5, and this dividedby the pitch will give the answer. As the pitch in this caseis one inch, then 8482.5 pounds is the answer. Now, if thisscrew was two inches pitch then we would have a pressureof one-half as much, or 4241.25… … In this example, Fig. 8,we have two pulleys ordrums on the same shaft.A is 24 diameter and B is7 diameter; a weight of 40pounds is suspended fromthe largest pulley, shownat C; what weight will berequired at D to balance theweight at C? A being 24and B 7, then 24-^7=3 3-7,and 40 times 3 3-7=about137…
Machinery
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