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Milling inside corners

Milling inside corners

Milling inside corners requires careful considerations of the suitable arc of cutter engagement, as well as the appropriate feed rate.



  • When feeding the cutter into internal corners, the radial arc of engagement will increase and place extra demands on the cutting edge
  • Often, the process becomes unstable, creating vibrations and an insecure process
  • Wobbling cutting forces often create undercutting of the corner
  • There is a risk for frittering the tool edges, or a total tool breakdown

Traditional corner milling
Corner radius = 50% x DC

Solution – limit the arc of engagement

Use a programmed radius (circular milling) to reduce the arc of engagement and a radial cut to reduce the vibration tendencies, which will allow higher depths of cut and feed rates when milling inside corners.

  • Mill a bigger corner radius than stated in the drawing. This can sometimes be favourable, as it allows the use of a bigger cutter diameter in roughing, which maintains high productivity
  • Alternately use a smaller DC cutter to mill the desired corner radius
Mill a bigger component radius,
Corner radius = 75% x DC
Use a smaller cutter,
Corner radius = 100% x DC


A programmed radius of 50% DC is optimal.


For finishing, it is not always possible to have such a large radius; however, the cutter diameter should be no larger than 1.5 x component radius, e.g. corner radius 10 mm (0.394 inch) = max 15 mm (0.591 inch).



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