Question

Shown in the figure is a gear driven squeeze roll which mates with an idler roll (not shown). The roll is designed to exert a normal force of 30 lb/in of roll length and a pull of 24 lb/in on the material being processed. The roll speed is 300 rev/min and an L10 life of 30 kh is desired. Use an application factor for poor bearing seals and commercial gearing. Select a pair of radial contact 6300-series medium, deep groove ball bearings to be mounted at O and A using the same 4" Dia size bearings. Gear 4 3" Dia 1.75" 8" 1.75" 2.75 Note, choose one or more than one of the following MC answers and then type the letter (s) corresponding to the question number in the essay section of this problem with supporting calculations contained on the scratch sheet. If the answer requires the correct answer is _"type that in the essay section as well. 8a) For this system: a) A load factor of 1.2 is applicable. b) An L10 = (6) life of 450 million cycles is required c) The resolved radial load at Ois 246 lb and at A is 613 lb. d) In the basic load rating relation, a=10/3 for ball bearings e) All of the above f) None of the above, the correct answer is: 8b) 6300 series bearing that works is: a) 30 mm bore b) 10 mm bore c) 20 mm bore d) 80 mm bore e) All of the above f) None of the above, the correct answer is:

Answer 1

7)a) A) for this system, 1) Load jactor of 12 is applicable 1) An 20 (2) fe of 450 mi llion is required c) The resolved radial load at o is 246 th and at is 613 d) a = 73 for ball bearing 813 Aniver is (e) all the above 2)6) 6300 series that works is G 20 mm bore