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Recommendations for Machining Methods

Face Milling
Including Milling Next to Square Shoulder

• It is recommended that a width of cut be no more than
diameter DC in order to prevent tooth overloading, because
of excess machining allowance in cusps produced on the
additonal passes after stepdown
• Down (climb) milling is preferable

Cutting into material
In milling, an approach cut by arc (“rolling in”) is preferable.
When a milling cutter enters a machined material by arc, the
chip thickness (and therefore, loading the cutting edge) grows
to a maximum value progressively and then gradually diminishes
to zero. It significantly contributes to machining stability,
improves tool life, and reduces vibrations.

Milling Hole of Diameter D
by Helical Interpolation
Maximum and minimum hole diameters
Dmax and Dmin correspondingly:
Dmax = 2 x DCX – 1, Dmin = DCX + DC APMX
• Down (climb) milling is recommended, however if chip
evacuation is problematic, up (conventional) milling
may provide better results DC
• Helical pitch should not exceed the maximum depth of cut APMX
• Helix angle should not exceed the maximum ramping angle RMPX DCX
• It is recommended to reduce feed per tooth fz by 30-40%

Milling by Ramping Down

• Depth of ramping per pass should
not exceed maximum depth of cut APMX
• Ramping angle sould not exceed
maximum ramping angle RMPX
• Down (climb) milling is preferable APMX
• It is recommended to reduce feed RMPX
per tooth fz by 30-40%

52 FAST FEED MILLING