Question:

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 rpm, then speed of the lead screw is:

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To calculate lead screw speed, use the formula: Lead screw speed = (Spindle speed × Pitch of lead screw) / Pitch of thread.
Updated On: May 22, 2025
  • 200 rpm
  • 20 rpm
  • 120 rpm
  • 180 rpm
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The Correct Option is B

Solution and Explanation

1. Relation Between Spindle Speed and Lead Screw Speed:
The speed of the lead screw (or the feed rate) is determined by the spindle speed and the pitch of the lead screw. The relationship is: \[ \text{Lead screw speed} = \frac{\text{Spindle speed} \times \text{Pitch of lead screw}}{\text{Pitch of thread to be cut}} \] 2. Substituting Values: \[ \text{Lead screw speed} = \frac{60 \, \text{rpm} \times 6 \, \text{mm}}{2 \, \text{mm}} = 20 \, \text{rpm} \] 3. Conclusion:
The speed of the lead screw is 20 rpm to cut the screw threads with a 2 mm pitch.
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