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
# \7 J7 T$ B% z3 x9 }%
N0010 G40 G17 G94 G90 G70
N0020 G91 G28 Z0.0
:0030 T00 M06
+ {+ g% p5 U+ b8 W! F* FN0040 G0 G90 X1.6114 Y-.1268 A35.538 B0.0 S0 M03
$ Q7 E) O1 h  H9 [1 sN0050 G43 Z1.0582 H00
: O0 K. D% B, }, N" pN0060 G81 X1.6114 Y-.5858 Z-.0962 R.4156 F9.8
' Q8 P# L0 h+ g2 R8 Y2 y) k" WN0070 X.9815
N0080 X.0366
. h  g0 [* M& J* S$ \1 PN0090 X-.2784
; [- s3 Z/ i7 e8 g4 ?/ dN0100 X.3516
N0110 X.6665
5 c+ K8 C( j9 _9 k4 Z; EN0120 X1.2965
N0130 X1.9264
& |  N! R. n" J) }" I2 L9 ^+ u0 bN0140 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
; `6 ^4 y, d1 j. O4 L; AN0160 X2.115 Y-1.7648 Z-2.0254 A0.0 B324.462 R-1.5136
/ W3 S% S+ ?# V# j. i5 H$ eN0170 Y-1.4499
N0180 G80
N0190 G0 Z-.871
N0200 X2.574
N0210 Z-.6019
2 X  y; m6 A& `5 {* n9 TN0220 X2.1974 Y-1.1811
5 i6 d! g: D1 t; _2 B  @N0230 M02
4 H$ ~- Y& L# M6 R; h2 n%

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。