# Lathe operation cutting time

Learn how to calculate cutting time on a lathe. Quickly and accurately figure out the time needed for your next machining project with our easy-to-use lathe cutting time calculator.

Calculate the time needed for threading and cutting lathe operations from a given length, diameter of the tap, and revolutions of the job per minute using the Lathe Cutting Time Calculator.

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Time for Tapping = \frac{L + \frac{D}{2}}{P \times r.p.m}

Time for Cutting = \frac{\frac{3}{2} \times (L + \frac{D}{2})}{P \times r.p.m}

**where**:

- P is the pitch of the thread in millimeters
- L is the length of the threaded portion in millimeters
- D is the diameter of the tap used in millimeters
- r.p.m is the revolutions per minute of the job.