180
G CODES
96-8000
June 1999
MORE M ISCELLANEOUS G CODES (G60, G61, G64)
G60 Uni-Directional Positioning Group 00
This G code is used to provide positioning always from the plus direction. In older systems it was used to
reduce backlash and is not recommended for use with this control. It is provided only for compatibility. It is non-
modal so does not affect the following blocks. Setting 35 controls the distance an axis is positioned past the
point prior to reversing for an approach in the plus direction.
G61 Exact Stop Modal Group 13
The G61 code is used to specify exact stop. It is modal and thus affects the following blocks. Rapid and
interpolated moves will decelerate to an exact stop before another block is processed. In exact stop, moves will
take a longer time and continuous cutter motion will not occur.
This may cause deeper cutting where the tool stops.
G64 G61 Cancel (Select Normal Cutting Mode) Group 13
The G64 code is used to cancel exact stop. It is modal and thus affects the following blocks. Rapid and
interpolated moves will not decelerate to an exact stop before another block is processed. Rapid blocks will
decelerate to within the distance specified in Parameters 101-104 before another block is processed and
interpolated motion will not decelerate at all before the next block is processed.
BOLT H OLE P ATTERNS (G70, G71, G72)
There are three G codes that provide patterns usually used for bolt holes. These are G70, G71, and G72. They
are normally used with one of the Group 09 canned cycles.
G70 Bolt Hole Circle Group 00
I Radius (Minus Reverses Direction)
J Starting angle (0 to 360.0 degrees CCW from horizontal)
L Number of holes evenly spaced around the circle
This G code must be used with one of the canned cycles G73, G74, G76, G77, Or G81-G89. The tool must be
positioned at the center of the circle either in a previous block or in the G70 block. G70 belongs to Group zero
and thus is non-modal. For a G70 to work correctly, a canned cycle should be active so that at each of the
positions, some type of drill or tap cycle is performed.
G71 Bolt Hole Arc Group 00
I Radius
J Starting angle (Degrees CCW from horizontal)
K Angular spacing of holes (+ or -)
L Number of holes
This G code is similar to G70 except that it is not limited at one complete circle. G71 belongs to Group zero
and thus is non-modal. For a G71 to work correctly, a canned cycle should be active so that at each of the
positions, some type of drill or tap cycle is performed.
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