Thursday, November 1, 2018

Simple Calculation for Hole and Boss Milling

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During hole and boss milling there are center distance of cutter axis and hole/boss center is very important.

This CD is defined the pitch circle diameter of cutter rotation. One condition is affect on hole milling that the cutter diameter is greater than half of hole diameter and stating point of program must be at center of hole/boss.

Formula of hole milling from the fig.


CD= (Hole Diameter - Cutter Diameter)/2


For Boss milling

CD= ( Boss Diameter + Cutter Diameter)/2

For example

The hole is 12mm of Dia. and cutter Dia. is 8mm than...

  • CD = (12-8)/2
  • CD = 2

Program:

N01 G01 X2 F200
N02 G03 X-2 R2
N03 X2 R2

And if Boss dia. is 15mm and cutter dia. 10mm than
  • CD =(15+10)/2
  • CD = 12.5

Program:

N01 G01 X-12.5 F200
N02 G02 X12.5 R12.5
N03 X-12.5 R12.5