Manual for Solid Truck Tire Service Plants (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...rotating drives may therefore be directly applied in this instance. It should be observed that in a straight belt drive the directions of rotation of the two pulleys is the same rather than opposite as in the friction wheel and the gear drive. Where it is desired to run the pulleys in opposite directions, the belt is usually crossed to accomplish this purpose. RULES FOR COMPUTING PULLEY SPEEDS AND SIZES IN SINGLE BELT DRIVES The following explanations with concrete examples will furnish a basis for determining pulley sizes and speeds in installing service station equipment. To find the diameter of the driving pulley when the diameter and speed of the driven pulley, and the speed of the driving pulley are known. Rule: --Multiply the diameter of the driven pulley by its speed in revolutions per minute (R. P. M.) and divide the product by the speed of the driving pulley. Example: --If the diameter of the driven pulley is 32 inches (as it many times is on a hydraulic press) and its required speed 150 R. P. M. and the speed of the driving pulley is 800 R. P. M., then the diameter of the driving pulley is 32x150.., 800 == mcnes To find the speed of the driven pulley when the diameters of the driving and driven pulleys, and the speed of the driving pulley are known. Rule: --Multiply the diameter of the driving pulley by its speed, and divide the product by the diameter of the driven pulley. Example: --If the diameter of the driving pulley is 8 inches, its speed is 600 R. P. M. and the diameter of the driven pulley is 32 inches, then the speed of the driven pulley is Qo-8T600-"-WO R. P.M. As this speed of 150 R. P. M. falls within the prescribed limits of most effective speeds the arrangement is satisfactory. If the result is a speed outside of these limits, howev...