In Prob 8 67, determine the couple that must be applied to shaft AB to rotate the gear clockwise Problem 8 67 The square threaded worm gear shown has a mean radius of 1 5 in and a lead of 0 375 in The larger gear is subjected to a constant clockwise couple of 7 2 kip sdot in Knowing that the coefficient of static friction between the two gears is 0 12, determine the couple that must be applied to shaft AB to rotate the large gear counterclockwise Neglect friction in the bearings at A, B, and C 7 2 kip in 12 in

Question: In Prob. 8.67, determine the couple that must be applied to shaft AB to rotate the gear clockwise. Problem 8.67: The square-threaded worm gear shown

In Prob. 8.67, determine the couple that must be applied to shaft AB to rotate the gear clockwise. Problem 8.67: The square-threaded worm gear shown has a mean radius of 1.5 in. and a lead of 0.375 in. The larger gear is subjected to a constant clockwise couple of 7.2 kip ⋅in. Knowing that the coefficient of static friction between the two gears is 0.12, determine the couple that must be applied to shaft AB to rotate the large gear counterclockwise. Neglect friction in the bearings at A, B, and C

7.2 kip in. 12 in.

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