System information

SECTION FOUR - PREPARATORY FUNCTIONS (G CODES)
Example: 1/4-20 tap, spindle rpm 400
1/20 = .05 (lead)
400 x .05 = 20 (feedrate)
Feedrate may need adjustment for proper operation of tap holder. If tap is pulled too far in the
holder, feedrate should be increased. If tap is pushed into the holder, feedrate should be
decreased.
Counter Bore (G75)
The counter bore is identical to the circular finish inside cycle (G25). It always does a climb cut
(counter clockwise). It always does a plunge to the center (not a ramp). It can be used in bolt
hole patterns or any other drilling patterns.
F__ (XY Feed Rate)
P150=__ Counter Bore Radius
P503=__ O is cutter comp off, 1 is cutter comp on
G75 G98/G99 Z__ R__ V__ Q__ F__
The G75 command specifies the counter bore cycle. The cycle will do the following.
1. Rapids to point R.
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