210
G CODES
96-8000
June 1999
RIGID T APPING
G174/ G184 General-Purpose Rigid Tapping (This G-code is optional and requires a probe) Group 00
F Feed rate in inches per minute
X* Optional X position at bottom of hole
Y* Optional Y position at bottom of hole
Z* Optional Z position at bottom of hole
This G code is used to perform rigid tapping for non-vertical holes. It may be used with a right-angle head to
perform rigid tapping in the X or Y axis on a three axis mill, or to perform rigid tapping along an arbitrary vector
with a five-axis mill. When performing a five-axis rigid tap, the machinist must ensure that the head is posi-
tioned correctly before the G184 command is given. If the head is not aligned with the direction of motion, the
tool will break. The ratio between the feed rate and spindle speed must be precisely the thread pitch being cut.
Because only the end point of the tap is specified with this canned cycle, it is not modal. A motion to the next
starting position will normally occur between G174/G184 canned cycles. G184 commands clockwise motion of
the spindle during entry, and G174 command counter-clockwise motion. You do not have to start the spindle
before this canned cycle.
IN P OSITION A CCURACY (G 187)
G187 Accuracy Control Group 00
Programming G187 is as follows:
G187 E0.01 (to set value)
G187 (to revert to setting 85 value)
The G 187 code is used to select the accuracy with which corners are machined. The form for using G 187 is
G 187 Ennnn, where nnnn is the desired accuracy. Refer to "Contouring Accuracy" for more information.
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