Solve this one please A vehicle jack has single start square thread, a 20 mm major diameter and a pitch of 3 mm. A plain thrust collar of30 mm diameter is used. Coefficients of running friction are 0.15 and 0.1 for the screw and collar respectively.What is the thread root diameter d, ?(Answer in mm)Answer:What is the mean diameter, dm, of the screw ?(Answer in mm)Answer:What is the load, W, on the power screw, if the power screw jack supports a mass of P = 1172 kg? Assume that the armsof the jack are at an angle of 0 = 33°, as shown in the diagram.O a. 10555.0NO b. 8852.2 NO. 6854.5 NO d. 17704.3 NWhat is the running torque required to raise the mass of P = 1172 kg, when 0 = 33° ?(Answer in N.m)

thread root diameter = diameter - pitch = 20-3 = 17mm

Answered: A vehicle jack has single start square…

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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A square thread power screw has pitch of 4-mm with double threads. Applicable data are threadand collar coefficient of friction equal to 0.08, collar diameter of 40-mm, and a load of 6.4-kNper screw and mean diameter of 30mmDetermine:a. Torques required to rotate the screw with” and “against” the load.b. Overall efficiency.
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34 in 3. The following data apply to the C-clamp: a. The screw is ACME with ¾" Diameter b. Coefficient of thread friction = 0.12 c. Coefficient of collar friction = 0.23 d. Mean collar radius = 0.55 in. e. Max. clamping force = 1000 lb Determine: The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p))
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Q1) The V thread of a screw jack has a single start with out side diameter 40 mm and 6 mm pitch. The angle of V is 55° and the load is carried on a swivel head of mean diameter 60 mm. the coefficient of friction between the nut and screw is 0.16 and that between the swivel head and the spindle is 0.1. Calculate the load required to be applied at the end of two levers each of effective length of 500 mm to raise an axial load of 1 KN and the efficiency of the lifting.
A square thread power screw has pitch diameter of 1.8 and lead of 1-in. Neglecting collar friction, compute the coefficient of friction for threads If the screw efficiency is 65%.
A trapezoidal-threaded power screw with a crest diam- eter of 30 mm and single thread is used to raise a load of 50 kN. The collar mean diameter is 40 mm. The coeffi- cient of friction is 0.12 for both the thread and the collar. Determine the following: (a) Pitch diameter of the screw. Ans. dp = = 27.0 mm.
Answer TWO QUESTIONS only. Only tables and charts are allowed Q1. A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 4000 N. A plain thrust collar of 50-mm mean diameter is used. Coefficients of running friction are estimated as 0.12 and 0.09 for f and fc, respectively. (a) Determine the screw pitch, lead, thread depth, mean pitch diameter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. (c) Estimate the efficiency of the jack when raising the load.
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(5) A 2½-in square thread steel screw is used in a common jack screw. There are 2¼TPI. The body of the jack is made of cast iron. The coefficient of friction on the threads is 0.15. The thrust collar at the top has an inside diameter of 1½-in & the outside diameter of 3.0in. The coefficient for the collar is 0.25. The load to be lifted by the jack screw is 2 tons. Determine: (a) the efficiency of the screw only; (b) the efficiency of the screw & the thrust collar; (c) the pull necessary @ the end of a 2.0ft lever to operate this screw jack.
A double square thread power screw has a mean radius of 90 mm and pitch of 12 mm is used to lift a load of 90 kN. If the friction of screw Is 0.14 and collar torque Is 25% of input torque, find the input torque required.
Plz answer (a) , (f) , & (g)

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