Chatter Prediction for Variable Pitch and Variable Helix Milling

Figure 6

Stability charts for 2-DOF down-milling model with pitch angle 80-100-80-100°.

(a) Helix angle 30-35-30-35°

(b) Helix angle 30-40-30-40°

(c) Helix angle 35-40-35-30°

(d) Helix angle 35-45-35-45°