Okuma G74 Reverse Tapping Cycle: Expert Programming Guide

Okuma G74 Reverse Tapping Cycle

G74 Reverse Tapping Cycle

Programming

G74 X__Y__Z__R__P__Q__F__

Parameters

Machining Sequence

(1) Positioning along the X- and Y-axis at a rapid feedrate
(2) Positioning to the point R level at a rapid feedrate
(3) Tapping to the point Z level at the specified cutting feedrate with the spindle rotating in the CCW direction.
(4) Dwelling at the point Z level for P seconds, then reversal of the spindle rotating direction to the CW direction.
(5) Returning to the point R level at a cutting feedrate
(6) Dwelling at the point R level for Q seconds, then reversal of the spindle rotating direction back to the CCW direction.
(7) Returning to the return-point level at a rapid feedrate.

Details

• Dwell is not executed if a P and/or Q value is not specified. The units of P and Q values are the same as used for the G04 mode dwell command.
• A feed override is disregarded during reverse tapping operation.
• If the SLIDE HOLD button is pressed during the return from the point Z level to the point R level, the cycle stops after the point R level is reached.
• If positioning to the next tapping point is executed at the point R level after the start of the spindle counterclockwise rotation but before the tapping tool is completely disengaged from the workpiece, enter a dwell at this level by specifying Q.
• Both the cutting feedrate override and the spindle speed override value are fixed at 100%. A rapid feed override can be set.