Transfer functions in X and Y directions at the tool tip have been measured on twodifferent similar machines (Figure 1, a and b). Please compare these two machines interms of dynamic stiffness and stability in the cutting.

4 Magnitude (Displacement/Force) [m/N] 7 Magnitude (Displacement/Force) [m/N] * 107 5 Mitsui Seiki HJ100A, TR Func. X Direction 4.5 Machine A Machine B 3.5 3 2.5 2 1.5 1 0.5 4 0 200 300 400 500 Frequency [Hz] 600 700 800 900 1000 x 10-7 8 a) Transfer function measurements in X direction Mitsui Seiki HJ100A, TR Func. Y Direction Machine A Machine B 0 200 300 400 500 600 700 800 900 1000 Frequency [Hz] b) Transfer function measurements in Y direction Figure 1. Transfer function comparison at the tool tip.