解:选用T1=ф20铣刀、T2=中心钻、T3=ф6.8铣刀、T4=M8*1.25丝锥。
O001
G17 G40 G80
N001 G00 G91 G30 X0 Y0 Z0 T1;
M06;
G00 G90 G54 X175.Y-80.;
G43 H01 Z10 M03 S1800;
Z-52.;
GO1 G41 D01X150. Y-160.F400;
X50. F150;
Y-140.;
G03 X-50. Y-140. R50. F150;
G01 Y-160.;
X-100.;
Y150.;
G02 X-90. Y160.;
G01 X50.;
X150. Y0.;
Y-180.;
G40 G00 Z100.;
G00 X-120. Y-20.;
Z-20.;
G01 G41 X-50. F300;
Y0.;
G02 I50.;
G01 Y20.;
G00 G40 Z100.;
G17 G40 G80
N002 G00 G91 G30 X0 Y0 Z0 T2;
M06;
G00 G90 G54 X-75.;
G43 H02 Z20.M03 S1800;
G98 G81 Z-23. R-17. F200;
X0. Y75.;
X75.Y0.;
Y-75. X0;
G00 G80 Z100.;
G17 G40 G80
N003 G00 G91 G30 X0 Y0 Z0 T3;
M06;
G00 G90 G54 X-75. Y0.;
G43 H03 Z10.M03 S1000;
G98 G83 Z-55. R-15 Q20. F150;
X0. Y75.;
X75.Y0.;
Y-75. X0;
G00 G80 Z100.;
G17 G40 G80
N004 G00 G91 G30 X0 Y0 Z0 T4;
M06;