Answer Happy

Problem 2 We have derived the formula for estimating the torque needed to raise a load using a square threaded power screw. The same raising torque for an ACME threaded power screw can be calculated using, TR Fdm (1 + afdm sec a 2 Adm - fl seca where the thread geometry of the ACME thread is given by Figure 1 and a =14.5°. -p р 2 29° р 2 - d d, Figure 1. ACME thread geometry Compare the torque requirement of a single start ACME threaded power screw 25-mm power screw is 25 mm in diameter with a pitch of 5 mm with the raising torque of a square threaded power screw of same diameter and pitch. Note: You have already determined the torque for the square threaded screw in Problem 1.