CNC Keyway Calculator

The CNC Keyway broach cut time calculator performs the following:

  • Roughly calculates cycle time when keyway broaching in a CNC machine
  • App calculates cut time based on keyway depth, length, & depth of cut
  • This feature was added by the request of
  • These calculations may vary depending on the speed of your machine

Calculate your Clearance Undercut Diameter Below

When broaching a keyway in a CNC machine, you must always program the broach to cut completely through the material and into an open feature such as a cross hole or an internal groove. The most common programming technique is to cut an internal groove (or undercut) behind the keyway. When doing this you must remember that the corners of the broaching insert are farther from center than the flat at the top of the insert. For instance, a tool that is cutting a .375" wide keyway will need an undercut that is .038" larger in diameter than a .250" wide keyway. The calculator below quickly finds the diameter and allows for an additional .025" for chip clearance.

CrossHole Example2
Keyway Undercut Image

CNC Machinist Calculator Pro is a machining calculator designed to make your life easier. Our app is perfect for CNC programmers or operators who need to make quick calculations on the fly. It includes the following features:

1. Turning Calculators 2. Milling Calculators 3. Drilling Calculators 4. Gun drilling Calculator 5. Thread Calculators 6. True Position Calculator 7. Bolt Pattern Calculator 8. Surface Finish Calculators 9. Drill & Tap charts 10. Thread Pitch charts 11. Center drill data 12. Unit converters 13. Hardness conversions 14. G-codes 15. M-codes 16. Blue Print GD&T 17. Machinability & cutting speed data for over 180 materials 18. Tap Drill Calculator for roll form & cut taps 19. Geometric calculators 20. Triangle Solver 21. Angle conversions 22. Circular segment calculator 23. Fraction Converter 24. Custom Macro info. 25. CNC Keyway cut time calculator 26. Thread Pitch over 3 wires calculator 27. Export lathe G-code for chamfers, tapers, & radii with tool nose compensation 28. Material Property Search 29. Material Weight Calculator 30. Tool Wear information with images 31. Machinist Test 32 Socket Head Cap Screw hole Dimensions . Download it today on iTunes or Google Play. See our Privacy Policy.