Please select your country! -English -EN Settings


Please select your country!


{{"ifind_go-back" | translate}}


Widening a hole by milling

Widening an existing hole can be performed either by circular ramping or circular milling.

Widening a hole by circular ramping
Circular ramping
Widening a hole by circular milling
Circular milling
Circular ramping – 3 axes
  • Constant ramping
  • No entry or exits
  • Cutter constantly engaged
  • Ramping action – bottom cutting

First choice:

  • Depth of hole is greater than the maximum ap for tool
  • Best hole concentricity and roundness
  • In vibration sensitive applications
Circular milling – 2 axes

Circular milling is an alternate method to the traditional use of boring tools. Circular milling can be performed by moving most 90 degree cutters in a circular tool path.

  • Constant Z
  • Entering and exiting for each level
  • Rolling entrance into cut should be programmed
  • Hole tolerance with boring is not as good as with circular milling
  • Step marks at each pass

First choice:

  • Program tool path more than 360 degrees to avoid step marks
  • Only one pass is required
    • Cutter with high ap capability
    • Shallow hole
  • Ramping capability poor or nonexistent – long edge without axial support

Calculating feed

Feed needs to be reduced due to:

  • Increased ae relative to straight cutting, which reduces the chip thinning effect
  • Peripheral feed is greater than the tool centre feed
  • Calculate feed based upon Dvf.

Entrance into cut

Rolling into cut ensures thin chips on exit. Low engagement angle reduces vibrations and ensures high productivity.



We use cookies to enhance the experience on our website. More about cookies.