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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.

 

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