Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . proportions .of a standard Brown (k Sharpegear tooth of U diametral pitch, making a rough sketch and put-ting the dimensions on it. 2. Suppose the above tooth to be loaded at the top with5,000 lbs. If the face be 6 inches, calculate the fiber stress at thepitch line, due to bending. 3. A tooth load of 1,200 lbs. is transmitted between twospur gears of 12-inch and 30-inch diameter
Cyclopedia of mechanical engineering; a general reference work Editor-in-chief Howard Monroe Raymond Assisted by a corps of mechanical engineers, technical experts, and designers of the highest professional standing . proportions .of a standard Brown (k Sharpegear tooth of U diametral pitch, making a rough sketch and put-ting the dimensions on it. 2. Suppose the above tooth to be loaded at the top with5,000 lbs. If the face be 6 inches, calculate the fiber stress at thepitch line, due to bending. 3. A tooth load of 1,200 lbs. is transmitted between twospur gears of 12-inch and 30-inch diameter, the latter gear making100 revolutions per minute. Calculate a suitable pitch and faceof tooth by the Lewis formula. 4. Assuming a i-incli web on the 12-inch gear, calculate theshearing fiber stress at the outside of a hub 4 inches in diameter 5. Design elliptical arms for the 30-inch gear, allowingS = 2,200. 0. Design cross-shaped arms for 30-inch gear. 7. Calculate the dimensions shown in formulse 70 to 82 in-clusive for a pair of bevel gears of 20 and 60 teeth respectively, 2diametral pitch, and 4-inch face. (The use of logarithmic tablesmakes the calculation ranch easier than with the natural functions.). MACHINE DESIGN 130 A worm wheel has 40 teeth, 3 diametral pitch, and doubleCalculate (a) its lead; (/*) its pitch diameter. thread. FRICTION CLUTCHES. i?0T.\TION—Tho (iillowing uotaiion is used throughout the chapter onFriction Clutches:. a = Angle between clutch faceand axlsot shaft (degrees) H =Horse newer (33jiXKi minute). li, =Coefllcient of friction (percent). N =Number of revolutions perminute. P =Force to hold clutch in gearto produce W (lbs.). R =Mean radius of friction sur-face (inches). T =Twisting moment aboutshaft axis (inch-lbs.). V =Force normal to clutch face(lbs.). W =Load at mean radius offriction surface (lbs.). ANALYSIS. The friction clutch is a de-vice for connecting atwill two separate piecesof shaft, transmitting anamount of power be-tw
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