毛坯的直径为Φ95mm，要求粗加工循环为精车循环留出加工余量：直径方向0.4mm，轴向0.2mm。工件坐标系如图中所示。

%0012

G92 X100 Z40

N100 G00 X96.Z20.

N110 G95 F0.3

N120 G71 U3. R1.P130 Q220 X0.4 Z0.2 F0.3

N130 G00 X42.

N140 G01 Z0

N150 G03 X52. Z-5. R5.

N160 G01 Z-30.1

N170 X65.

N180 X68. Z-31.5

N190 Z-63.

N200 X73.

N210 X95. Z-70.

N220 Z-85.

N230 M30