Fasteners A triple square thread power screw with a major diameter of 28-mm and a pitch of 8-mm is used to shift aneffective load of 15KN quickly between two points. The hard steel screw (AISI 1050, cold drawn) runs in alubricated nut with an effective friction of 0.15. The 38 mm diameter collar forms an integral part with thescrew, supported in a bronze bush. Allowing for a factor of safety of 3, determine the:a. Thread depth, thread width, mean or pitch diameter, minor diameter, and lead.b. Torque required to rotate the screw "against" the load.c. Torque required to rotate the screw “with" the load.

Answered: Image /qna-images/answer/974eb9bc-1785-4895-a77f-411a5993d551.jpg

Answered: A triple square thread power screw with…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Problem: A double-threaded power screw with ISO metric trapezoidal threads is used to raise a load of 300 kN, The nominal diamter is 100 mm & the pitch is 12mm. The coefficient of friction at screw threads is 0.15. Neglect the collor friction. Q.45 Torque required to raise the load is
A link in a mechanism is to be subjected to a tensile force that varies from 3500 to 500 N in acyclical fashion as the mechanism runs. It has been decided to use AISI 1040 cold-drawn steel.Complete the design of the link, specifying a suitable cross-sectional shape and dimensions.5. Specify the required length of no. 60 chain to mount on sprockets having 15 and 50 teeth with acenter distance of no more than 36 in.
RB&W11 recommends turn-of-nut from snug fit to preload as follows: 1/3 turn for bolt grips of 1-4 diameters, 1/2 turn for bolt grips 4-8 diameters, and 2/3 turn for grips of 8-12 diameters. These recommendations are for structural steel fabrication (permanent joints), producing preloads of 100 percent of proof strength and beyond. Machinery fabricators with fatigue loadings and possible joint disassembly have much smaller turns-of-nut. The RB&W recommendation enters the nonlinear plastic deformation zone. The figure shows a cross section of a grade 25 cast-iron pressure vessel, with a torque factor K of 0.09. Use Eq. (8-27) to estimate the torque necessary to establish the desired preload given that preload F;= 14.4 kip, bolt stiffness kb = 5.21 x 106 lbf/in, number of threads N=11, and material stiffness km = 8.95 × 106 lbf/in. in-11 UNCX 2 in grade 5 finished hex head bolt in in 162 No. 25 CI Determine the torque necessary to establish the desired preload and the turn of the nut in…
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Question 3 A single square thread power screw is to raise a load of 50 KN. A screw thread of major diameter of 34 mm and a pitch of 6 mm is used. The coefficient of friction at the thread and collar are 0.15 and 0.1 respectively. If the collar frictional diameter is 100 mm and the screw turns at a speed of 1 rev/s. (Given dm = 31mm, 1 = 6mm, dc = 100mm). Find: (a) the power input to the screw. (b) the combined efficiency of the screw and collar.
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Ex 3: A double threaded power screw with ACME threads is used to raise a load of 300kN. The nominal diameter is 100mm and the pitch is 12mm. The coefficient of friction at the screw threads is 0.15. Neglecting collar friction, calculate 1- Torque required to raise the load. 2- Torque required to lower the load. 3- Efficiency of the screw.

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