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Problem No. 3: Two, 24-in standard square threaded power screw with pitch of 0.5 in are used to raise and lower a hydrau
Posted: Mon May 16, 2022 6:11 am
by answerhappygod
- Problem No 3 Two 24 In Standard Square Threaded Power Screw With Pitch Of 0 5 In Are Used To Raise And Lower A Hydrau 1 (41.78 KiB) Viewed 63 times
Problem No. 3: Two, 24-in standard square threaded power screw with pitch of 0.5 in are used to raise and lower a hydraulic gate weighing 60 tons. An electric motor operates the two screws. The coefficients of collar and thread frictions are 0.03 and 0.14 respectively. Mean diameter of the collar is 4 inches. If the gate rises at the rate of 2 ft/min, determine: a. The rpm of the screws; b. Motor size in HP required to lift the gate if the mechanical efficiency is 85%.