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Metric thread of 0.8 mm pitch is to be cut on a lathe. Pitch of the lead screw is 1.5 mm. If the spindle rotates at 1500 rpm, the speed of rotation of the lead screw (rpm) will be________.
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- 900
- 700
- 800
- 400
Correct Option: C
Pitch = 0.8 mm
Nt = 1500 rpm
Ps = 1.5 mm
Ns × P3 × Zz = Nt × Pt × Zt
[Zs = Zt = 1]
| Ns = | 1.5 × 1 |
Ns = 800 rpm
