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Quite often in order to start cutting in x-y direction you need to first plunge into the material.

Here is a compliled list of recommendations for different kinds of plunging that works in most if not all cases.

Plunge with center cutting endmill:

  • Regular Chipload/Number of flutes , half the cutting speed. (for 3 flute endmill divide normal chipload by 3)

Ramp:

  • Ramp Radius (For Helical ramping): .90-.95 of cutter radius
  • Ramp Angle: Indexed/non center cutting endmills: 1-2.5 degree; Center cutting endmills- Up to 45 deg

Ramp chipload ajustment for 4 flute Center cutting endmills:

  • 0-2.5deg=100% of normal feedrate
  • 2.5-5deg=75% of normal feedrate
  • 5-15deg=50% of normal feedrate
  • 15-30deg=25% of normal feedrate
  • 30-45deg=5% of normal feedrate

Dont forget to reduce cutting speed for ramping above 5deg by half!

--Eldar Gerfanov

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