A screw jack having a 2 in double-thread Acme screw and a plain thrust collar having a 3.2 in mean diameter is being used to raise a load. Given the coefficient of static friction for the collar is 75% of the coefficient of static friction for the screw threads (μcs = 0.75 µs), determine the minimum allowable coefficient of static friction for the screw threads if the jack is to be "Self- Locking" (i.e. The handle of the jack should not "unwind" when it is released after raising the load.). Hint: Start with the "Load Lowering Screw Torque Equation" (i.e. The "TLL" equation which is essentially Eqtn. 10.5 Pg 380 (Textbook)), include collar friction (i.e. Collar Torque), use the "static" coefficients of friction, and solve the inequality TLL ≥0 for the screw thread coefficient of friction (Ms). Ans. = μsmin 0.03664
A screw jack having a 2 in double-thread Acme screw and a plain thrust collar having a 3.2 in mean diameter is being used to raise a load. Given the coefficient of static friction for the collar is 75% of the coefficient of static friction for the screw threads (μcs = 0.75 µs), determine the minimum allowable coefficient of static friction for the screw threads if the jack is to be "Self- Locking" (i.e. The handle of the jack should not "unwind" when it is released after raising the load.). Hint: Start with the "Load Lowering Screw Torque Equation" (i.e. The "TLL" equation which is essentially Eqtn. 10.5 Pg 380 (Textbook)), include collar friction (i.e. Collar Torque), use the "static" coefficients of friction, and solve the inequality TLL ≥0 for the screw thread coefficient of friction (Ms). Ans. = μsmin 0.03664
International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter7: Dry Friction
Section: Chapter Questions
Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...
Related questions
Question
solve show solution for answer given
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 1 steps with 3 images
Recommended textbooks for you
International Edition---engineering Mechanics: St…
Mechanical Engineering
ISBN:
9781305501607
Author:
Andrew Pytel And Jaan Kiusalaas
Publisher:
CENGAGE L
International Edition---engineering Mechanics: St…
Mechanical Engineering
ISBN:
9781305501607
Author:
Andrew Pytel And Jaan Kiusalaas
Publisher:
CENGAGE L