182
G CODES
96-8000
June 1999
CANNED CYCLES (G73, G74, G76, G81, G82, G83, G84, G85, G86, G87, G88, G89)
A canned cycle is used to simplify programming of a part. Canned cycles are defined for most common Z-axis
repetitive operation such as drilling, tapping, and boring. Once selected a canned cycle is active until canceled
with G80. When active, the canned cycle is executed every time an X or Y-axis motion is programmed. Those
X-Y motions are executed as rapid commands (G00) and the canned cycle operation is performed after the X-Y
motion. There are six operations involved in every canned cycle:
1) positioning of X and Y axes (and optional A),
2) rapid traverse to R plane,
3) drilling,
4) operation at bottom of hole,
5) retraction to R plane,
6) rapid traverse up to initial point.
A canned cycle is presently limited to operations in the Z-axis. That is, only the G17 plane is allowed. This
means that the canned cycle will be executed in the Z-axis whenever a new position is selected in the X or Y
axes.
The following is a summary of the canned cycles defined for the VF Series Mill:
G98 and G99 are modal commands that change the way the canned cycles operate. When G98 is active, the
Z-axis will be returned to the same position as at the start of the canned cycle when it completes. When G99
is active, the Z-axis will be returned to the R point when the canned cycle completes.
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