Find the load that can be lifted by applying a force of 200 N at the end of 450 mm long lever of screw jack using single start square thread. The pitch of the thread is 12 mm and mean diameter 65 mm. The load does not rotate with the screw spindle. The C.O.F. between threads is 0.15 and for collar is 0.12 with mean radius 40 mm. Find also the efficiency.

Find the load that can be lifted by applying a force of 200 N at the end of 450 mm long lever of screw jack using single start square thread. The pitch of the thread is 12 mm and mean diameter 65 mm. The load does not rotate with the screw spindle. The C.O.F. between threads is 0.15 and for collar is 0.12 with mean radius 40 mm. Find also the efficiency.

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 press with screw with ACME threads shown in Figure 2 has a rate load of 1500 N. The outside diameter of ACME screw is 30 mm, and its pitch is 3.5 mm. Coefficients of friction are u = 0.1 for the threads and le =0.15 for the collar. The collar diameter de = 23 mm. A force F= 30 N is applied at end the handle to operate the press, Design the length of the handle, L. 西意 P= 30 N | 500 N
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