Q1 A single-square thread power screw is to raise a load of 100kN. The screw has a major diameter of 42 mm and a pitch of 6 mm. The nut for the screw transfers the load as shown in the F/2 F/2 figure right. The power screw is made of carbon steel having Sy=350MPA and Sut= 500MPA. The nut is to be made of ASTM 25 h. gray cast iron having S,=220MPA and Suc=670MPA. The friction on the screw threads is 0.15 and the friction on the nut is ignored. Calculate; i) ii) ii) iv) Raising and lowering torques Efficiency for raising the load Check for the self-locking condition Nut height (h) when considering the failures due to direct shear at the root of the thread and bearing stress failure on nut. Take the factor of safety as 3. Critical load when the power screw is at maximum height of 850mm. v)

Q1 A single-square thread power screw is to raise a load of 100kN. The screw has a major diameter of 42 mm and a pitch of 6 mm. The nut for the screw transfers the load as shown in the F/2 F/2 figure right. The power screw is made of carbon steel having Sy=350MPA and Sut= 500MPA. The nut is to be made of ASTM 25 h. gray cast iron having S,=220MPA and Suc=670MPA. The friction on the screw threads is 0.15 and the friction on the nut is ignored. Calculate; i) ii) ii) iv) Raising and lowering torques Efficiency for raising the load Check for the self-locking condition Nut height (h) when considering the failures due to direct shear at the root of the thread and bearing stress failure on nut. Take the factor of safety as 3. Critical load when the power screw is at maximum height of 850mm. v)

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

See similar textbooks

Similar questions

A bolt with a square threaded screw has mean diameter of 25 mm and a pitch of 3 mm. It carries an axial thrust of 10 kN on the bolt head of 25 mm mean radius. If u = 0.12, find the force required at the end of a spanner 450 mm long, in tightening up the bolt. 3. [Ans. 110.8 N] A turn buckle with right and left hand threads is used to counle twvo railway coaches The threads
None
The eye screw, shown in the figure below is subjected to a force of 35 kN. The material of the screw is steel with ??=355 ???. The safety factor is 1,5. Calculate the minimum diameter of the thread.
A collar is fitted as a tight fit on a solid shaft. made before assembly in measuring, the outer diameter of the ring is dga=159.97 mm, the inner diameter is dgi= 100.03 mm, the outer diameter of the shaft is dma= 100.048 mm. After assembly; a. What is the surface pressure between the shaft and the ring? b. What is the maximum shear stress? Given: Material pair steel/steel E=2.1x105 N/mm2 , Tmax = P (1/QG^2)
The static load P= 5000 lbf is applied at I= 10 inch. The value for r=5 inch. The material for bolt is SAE grade 8. Find the size of the bolts. Assume the factor of safety for shear is 2.