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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 screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be Correct Answer 20 r.p.m.

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Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is larger than pitch of lead screw.
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Pitch of work piece threads=2, pitch of the lead screw threads=4. Then, (driver gear/driven gear) =?
For cutting multi-start threads, the speed ratio is expressed in terms of the lead of the job thread and lead of the lead screw threads.
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