已知毛坯为Φ30mm的棒料，3号刀为外圆刀，试车削成图示的正锥。

  解 确定分三次走刀，前两次背吃刀量2mm，最后一次背吃刀量1mm。按第一种车锥路线进行加工，终刀距S =8mm;S =16mm。具体程序如下

%0001

N01 G92 X200.0 Z100.0

N02 M03 S800

T0303

N03 G00 X32.0 Z0

N04 G01 X0

G95 F0.3 (转进给)

N05 Z2.0

N06 G00 X26.0

N07 G01 Z0

G95 F0.4

N08 X30.0 Z-8.0

N09 G00 Z0

N10 G01 X22.0

G95 F0.4

N11 X30.0 Z-16.0

N12 G00 Z0

N13 G01 X20.0

G95 F0.4

N14 X30.0 Z-20.0

G94 F1000

N15 G01 X200.0 Z100.0

T0300

M05

N16 M30