System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
Program to Drill a 5 Hole 1" Radius Bolt Circle
N1 G20 G90 (Inch/Absolute)
N2 S1000 M3 G43 H1 (spindle CW 1000 RPM, activates tool #1's length
offsets)
N3 G81 G99 Z-1 R.1 F10
G81 Drill
G99 Return to R point
Z-1 Drill depth
R.1 R plane
X0 Y0 Center at X0, Y0
Q5 5 holes in 360°
F10 Z feedrate
N4 G72 X0 Y0 R1 Q5 P5 K0
G72 Bolt hole routine
R1 Radius of 1 inch
P5 Drill 5 holes
K0 Start angle 0°
Notes on Bolt Hole Routines
Note 1: If P is less than Q a partial bolt circle will be drilled.
Note 2 To go counterclockwise use a negative radius.
Note 3: If a move to the center of the bolt hole pattern is not desired the following
scheme may be used.
G81 G99 Z-1 R.1 F10
G65 X0 Y0
G72 R1 Q5 P5 K0
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