# A Treatise on Belts & Pulleys; Embracing Full Explanations of Fundamental Principles Proper Disposition of Pulleys Rules, Formulas & Tables for Determining Widths of Leather & Vulcanized-Rubber Belts & Belts Running Over Covered Pulleys

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## Description

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. 1906 edition. Excerpt: ...can evidently be calculated from one formula only appioximately, since the arms, nave, etc., vary considerably in A better and stronger form of split pulley is represented in Fig. 56. In this case all the arms are entire, and the pulley presents a better appearance, as well as a simpler form. According to Unwin (see "Elements of Machine Design," 168), the net section of the bolt at the rim should be one quarter the section of the rim plus square inch, and that of the bolt at the nave one quarter the section of the nave plus J square inch. different pulleys. We may. however, calculate the weights of pulleys with sufficient accuracy for ordinary purposes from the formula G = (0.163 j + 0.01 \$(f) + 0.00309(J) ) 3, . (608) in which G is the weight of the pulley in pounds, R and b respectively the radius of the pulley and width of the belt. Q The following table gives values of for different values of-7-: Example.--The radius of a pulley is 16 inches, and the width of the belt which runs upon the pulley 4 inches; required the approximate weight of the pulley. R 16 Here, ------4. From formula (608), G = (0.163 X 4 + 0.015 X 16 + 0.00309 X 64)64, G = (0.652 + 0.240 + 0.19776)64 = 1.08976 X 64; or, G--69.74 pounds. Example.--Required the approximate weight of a pulley for the data R = 36," b = 4%." In this case 14. Arms of Pulleys. Ordinarily the arms of pulleys have oval cross-sections, the diameter in the plane of the pulley being twice the smaller diameter. The profile of such a crosssection may be drawn by circlearcs as shown in Fig. 57. The dotted circle is drawn on the greater diameter Al of the pul1 ley-arm, and the arcs ab and a'b' have their centres respec WBjBir / tively in the points c and c'. sJc. v.oSi-''...show more

## Product details

• Paperback | 50 pages
• 189 x 246 x 3mm | 109g
• Miami Fl, United States
• English
• black & white illustrations
• 1236579038
• 9781236579034