Cut Time per Pass
Cut time per pass and total time from cut length and feed rate.
Example
You enter
- Feed entry rpm-ipr
- Cut length (in, incl. approach/overtravel) 6
- Spindle speed (RPM) 500
- Feed per revolution (IPR) 0.01
- Number of passes 4
You get
- Feed rate 5 IPM
- Time per pass 1.2
- Time (s) 72
- Total time 4.8
Checked against published worked examples from: CNC Concepts, Inc. (Mike Lynch).
Details, formula, and sources
Scopefeed_IPM = RPM x IPR (or entered directly), t = length / feed_IPM, total = t x passes (first-principles distance over feed rate).
Formula or tablefeed_IPM = RPM x IPR (when not entered directly); cut time t = L / feed_IPM (min); total = t x passes.
Source and editionCutting time as cut distance / feed rate, with feed rate = RPM x IPR - first-principles arithmetic as in Machinery's Handbook (Industrial Press), by name; public domain.
Free accessPure arithmetic, public; the cut length should include tool approach and overtravel, which the user adds.
What governsEstimate. AHJ and licensed professional govern.
API field namesfeed_mode, cut_length_in, rpm, feed_ipr_in, passes, feed_ipm, time_min, time_s, total_min
- Cut length L is the full tool-path distance including approach and overtravel, supplied by the usercutting-time geometry