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assign8 - Assignment 8 The diagram below illustrates a...

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Assignment 8 The diagram below illustrates a drive arrangement commonly used on drill presses and other kinds of machine tools. The motor is connected to the ultimate load (in this case a drill bit) by two belts. One of these connects the motor shaft to an idler shaft, and the other connects the idler shaft to the load. The speed at the load may be changed by changing the positions of the two belts. In the case shown, each belt can be placed in four possible positions. It is obviously not possible, however, to have both belts in the same position. This means that there are 4 * (4 – 1) = 12 belt position combinations, and hence 12 possible speeds. Motor Drill Primary Belt Secondary Belt Idler Pulleys 1 2 3 4 Belt Positions See “ drillPress.jpg ” for a picture of an actual machine. As is normally the case, there is a label (visible on the underside of the cover) that gives the user the speed produced by each of the possible belt combinations
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