Chatter Prediction for Variable Pitch and Variable Helix Milling

Table 1

System parameters.

Parameter items	Parameter values
Number of teeth
Tool diameter [mm]
Radial immersion ratio
Helix angle [degree]
Uniform pitch [degree]
Variable pitch [degree]
Modal masses [kg]	,
Damping ratio	,
Natural frequencies [Hz]	,
Normal cutting coefficients [Mpa]
Tangential cutting coefficients [Mpa]
Milling mode	Down-milling