Stability Analysis of Cutting Process with Internally Damped Rotating Tapered Composite Cutter Bar

Table 9

The effect of aspect ratio on critical rotating speed and instability threshold (ς = 0.01, σ = 0.75, and θ = 0°).

L/d	Critical speed (rad/s)	Instability threshold (rad/s)
12	1253	35148
14	919	25823
16	701	19768
18	553	15617