MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 2
FIGURE 8.
together; the power comes from one of the pulleys or gears.
Neglecting
slippage of the belting in a pulley train, the same method of determining
relative sizes applies to both systems.
EXAMPLE
Find the rpm of the 6 inch pulley shown in figure 9 on the following page.
Therefore
b.
Screw Gearing.
(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
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