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 }! ~& V1 s4 y%
N0010 G40 G17 G94 G90 G70
+ R4 h6 {" B) s. @* _N0020 G91 G28 Z0.0
:0030 T00 M06
4 G( Q( I" h% D/ rN0040 G0 G90 X1.6114 Y-.1268 A35.538 B0.0 S0 M03
N0050 G43 Z1.0582 H00
$ b7 E! K; l, `' {1 YN0060 G81 X1.6114 Y-.5858 Z-.0962 R.4156 F9.8
N0070 X.9815
N0080 X.0366
( Y' m, k6 F. r/ l* x6 JN0090 X-.2784
N0100 X.3516
" R4 z" b. h3 \  M+ |N0110 X.6665
! M  W* i% e& {; }9 @" z3 eN0120 X1.2965
N0130 X1.9264
N0140 X2.1579 Y-1.0945 Z-.802 A30.223 B340.346 R-.2902
6 T/ Y3 l4 G# SN0150 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
% Z) [  x# L( C, {1 iN0180 G80
# R- `* B& X* hN0190 G0 Z-.871
N0200 X2.574
N0210 Z-.6019
N0220 X2.1974 Y-1.1811
* P5 ]# g! ?4 S$ M8 M1 \N0230 M02
( H& }# K( v/ G- N% s) I%

五两三

R表示钻孔起始位置。
) l. @: G0 h' g! G" AR-.2902表示从Z-.2902的高度开始钻孔。