MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 2
together; the power comes from one of the pulleys or gears.
slippage of the belting in a pulley train, the same method of determining
relative sizes applies to both systems.
Find the rpm of the 6 inch pulley shown in figure 9 on the following page.
(1) Spiral. Gears are often used to reduce speed. The teeth on the gears
are arranged in the same manner as the threads of a screw. A spiral gear
may have any number of teeth. A one-toothed gear corresponds to a single-
threaded screw. A