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
5 I# p; ~/ Z$ S5 I%
( Y! w7 D' m) ^& I, yN0010 G40 G17 G94 G90 G70
' _) Q4 y) r( x) L' r* mN0020 G91 G28 Z0.0
6 s& |+ F- f8 N! I  {& z:0030 T00 M06
N0040 G0 G90 X1.6114 Y-.1268 A35.538 B0.0 S0 M03
N0050 G43 Z1.0582 H00
5 g' [0 O% ]+ U0 S% y; r" yN0060 G81 X1.6114 Y-.5858 Z-.0962 R.4156 F9.8
* w$ o8 m! v6 nN0070 X.9815
0 s1 ]/ b4 }- ?$ I  h1 cN0080 X.0366
& @3 d3 D  y7 LN0090 X-.2784
N0100 X.3516
N0110 X.6665
N0120 X1.2965
N0130 X1.9264
N0140 X2.1579 Y-1.0945 Z-.802 A30.223 B340.346 R-.2902
1 H2 g( M0 H, ]: ?! }N0150 X2.1759 Y-1.4292 Z-1.4947 A16.895 B328.259 R-.9829
- g' @) |. K5 Y8 G# o' n4 O2 P: kN0160 X2.115 Y-1.7648 Z-2.0254 A0.0 B324.462 R-1.5136
+ H3 m* f+ P' O; `7 aN0170 Y-1.4499
" e) q  {- L; O& ?- ]N0180 G80
N0190 G0 Z-.871
N0200 X2.574
N0210 Z-.6019
% y* e9 R! T5 j; R( IN0220 X2.1974 Y-1.1811
N0230 M02
%

五两三

R表示钻孔起始位置。
& V% [/ X1 o/ d( N' b9 {6 _- CR-.2902表示从Z-.2902的高度开始钻孔。