book: vector mechanics for engineers: statics 9th ed. Question: 8.72 In the mach
ID: 2992052 • Letter: B
Question
book: vector mechanics for engineers: statics 9th ed.
Question: 8.72
In the machinists's vise shown, the movable jaw D is rigidly attached to the tongue AB that fits loosely into the fixed body of the vise. The screw is single-threaded into the fixed base and has a mean diameter of 0.75 and a pitch of 0.25. The coefficient of static friction is 0.25 between the threads and also between the tongue and the body. Neglecting bearing friction between the screw and the movable head, determine the couple that must be applied tothe andle in order to produce a clamping force of 1 kip.
Explanation / Answer
Br=540N, Qr(H comp)=,L=2p=4 mm,pi x d=12 x pi mm,
=tan-1 (4/12pi)=6 deg , s= tan-1 s=19.29 deg.
s+= 25.3466 deg
Qr=540xtan 25.3466 deg= 255.80 N
Couple= rx Q =6mm X 255.80 =1535 N mm.
M=1.535 Nm.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.