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; how to use polar coordinates:
; use the format @radius^angle in place of specifying X,Y words
G20 G90
G0 X0 Y0 Z0
; drill three bolt holes on a 5" diameter
G0 X2.5 Y0
G81 R.1 Z-0.5 F60
^120
^240
G90 @1 ^33
; drill a row of holes 1" apart along a 33 degree feature
G91 G81 @1 R.1 Z-0.5 L5
G90 G0 X2 Y0
; drill 17 evenly-spaced bolt holes on a 4" diameter
G91 G81 ^[360/17] R.1 Z-0.5 L17
M2
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