System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
Bolt hole routine (G72)
The bolt circle autoroutine can be used with any of the drilling cycles. Drilling cycles, when used
with this autoroutine, differ in that hole positions are not specified. The G72 line indirectly
specifies all the hole positions based on specific input: number of holes in 360°, number of holes
to be drilled, the radius of the bolt circle, the starting angle of the first hole, and the center of the
bolt circle. The control will then calculate the position of each hole and rapid to each hole in
straight line moves. The angle of the first hole is the angle from the 3 o'clock position. A positive
starting angle is counterclockwise from 3 o'clock. A negative starting angle is clockwise from 3
o'clock.
Note: Holes will be drilled clockwise from the first position if the bolt hole radius is positive.
Holes will be drilled counterclockwise if the bolt hole radius is negative.
Definition of Starting Angle
The following is a format of the G72 command.
bolt hole center bolt circle in 360° to be drilled first hole
G72 X___ Y___ R___ Q___ P___ K___
position of radius of # of holes # of holes angle of
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