16874. 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

10 r.p.m.
20 r.p.m.
120 r.p.m.
180 r.p.m.
✅ The correct answer is option B.

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