五轴钻孔问题恳求各位高手回答

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有谁做过五轴钻孔的请教一个问题，下面程序N0140 X2.1579 Y-1.0945 Z-.802 A30.223 B340.346 R-.2902中R的含义是什么
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N0010 G40 G17 G94 G90 G70
/ l6 S2 U9 b$ G5 T/ o8 kN0020 G91 G28 Z0.0
+ q- v: W: g' Q) w/ |+ d:0030 T00 M06
0 A) |$ V1 {5 z8 X3 [0 }% oN0040 G0 G90 X1.6114 Y-.1268 A35.538 B0.0 S0 M03
N0050 G43 Z1.0582 H00
1 A% T; G) ^' TN0060 G81 X1.6114 Y-.5858 Z-.0962 R.4156 F9.8
  m1 w, ^5 w/ j+ M7 F; n6 Q% jN0070 X.9815
/ n* U$ P  H9 iN0080 X.0366
N0090 X-.2784
: O$ ?/ w& H1 L5 W! ~' QN0100 X.3516
N0110 X.6665
# x& w" z5 P7 D; f+ O; hN0120 X1.2965
N0130 X1.9264
) M$ T/ R& X6 z0 V/ a* D3 ?N0140 X2.1579 Y-1.0945 Z-.802 A30.223 B340.346 R-.2902
0 P  J% i1 N! ?9 ~% N- \3 U/ h: k8 jN0150 X2.1759 Y-1.4292 Z-1.4947 A16.895 B328.259 R-.9829
N0160 X2.115 Y-1.7648 Z-2.0254 A0.0 B324.462 R-1.5136
N0170 Y-1.4499
& r8 i+ F7 E- r$ vN0180 G80
N0190 G0 Z-.871
N0200 X2.574
N0210 Z-.6019
' `8 s0 g; F1 ?7 v2 J; iN0220 X2.1974 Y-1.1811
N0230 M02
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五两三

R表示钻孔起始位置。
R-.2902表示从Z-.2902的高度开始钻孔。