This lathe drilling time calculator finds how long it takes to drill a hole from the depth, feed rate, and spindle speed. Enter the values above to get the drilling time.
Formula
Time T = L ÷ (f × N)
- L — hole depth (plus drill point allowance), f — feed per rev, N — rpm
Example
L = 50 mm, f = 0.1 mm/rev, N = 800 rpm: T = 50 ÷ (0.1 × 800) = 0.625 min.
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Frequently Asked Questions
How do I calculate drilling time on a lathe?
Divide the hole depth by the feed per revolution times the spindle speed: T = L / (f x N).
Should I add the drill point length?
Yes. Add about 0.3 times the drill diameter to the depth to account for the conical point breaking through.
What feed rate should I use?
Feed depends on drill size and material; small drills use lighter feeds to avoid breakage.