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

It is required to cut screw threads of 2 mm pitch on a lathe. The lead

1.	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» C. 120 r.p.m.