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
' Z% k4 Z6 M+ j" NN0020 G91 G28 Z0.0
, @6 f! h8 p4 L; ?+ o:0030 T00 M06
N0040 G0 G90 X1.6114 Y-.1268 A35.538 B0.0 S0 M03
3 O0 H5 H' L# T) F0 KN0050 G43 Z1.0582 H00
N0060 G81 X1.6114 Y-.5858 Z-.0962 R.4156 F9.8
N0070 X.9815
0 D2 @" Q6 o! ]7 b2 X; L! O- M- ^! kN0080 X.0366
N0090 X-.2784
6 |# c9 y  }3 X" n, B2 B/ O. d, yN0100 X.3516
3 z% S4 W4 n6 ?% b9 k, b" _' O6 fN0110 X.6665
6 W. J; ?- i0 d' @6 o3 u1 k/ }9 WN0120 X1.2965
N0130 X1.9264
N0140 X2.1579 Y-1.0945 Z-.802 A30.223 B340.346 R-.2902
N0150 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
5 t' @: G( r2 d  rN0180 G80
N0190 G0 Z-.871
' u2 |/ F  t( }) MN0200 X2.574
' a- p1 k! E7 cN0210 Z-.6019
6 I( ]4 b  }$ Z4 n' M% XN0220 X2.1974 Y-1.1811
2 ?% o" u, ]+ g  [$ p& i9 HN0230 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。