It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be
A. 10 r.p.m.
B. 20 r.p.m.
C. 120 r.p.m.
D. 180 r.p.m.
Answer: Option B
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N2/P2 = N1/P1
60/6 = N1/2
60 x 2 / 6 = 20 rpm
Speed of lead screw=Spindle speed*Pitch/P of lead screw.
= 60*2/6 = 20.
v=s/t
Here time t is constant
V1/S1=V2/S2
V2=60*2/6=20 rpm