GATE ME 2017 Set 1 — Question 24
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Manufacturing Processes → Machining & Machine Tools → Conventional Machine Tools
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Question
Metric thread of mm pitch is to be cut on a lathe. Pitch of the lead screw is mm. If the spindle rotates at rpm, the speed of rotation of the lead screw (rpm) will be
Correct answer
800 to 800
Solution
In a lathe operation for thread cutting, the relationship between the spindle speed, lead screw speed, thread pitch, and lead screw pitch is given by:Let:
rpmThus, the speed of rotation of the lead screw will be rpm.
- = Spindle speed = rpm
- = Lead screw speed (to be found)
- = Pitch of lead screw = mm
- = Pitch of thread to be cut = mm
rpmThus, the speed of rotation of the lead screw will be rpm.
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