Rigid Tapping Cycle (G84) - Siemens SINUMERIK 802D sl Programming Manual

Enhanced Level Commands
4.1 Program support functions (1)
4.1.11

Rigid tapping cycle (G84)

When the spindle motor is controlled in rigid mode as if it were a servo motor,
a tapping cycle can be sped up.
Format
G84 X... Y... Z... R... P... F... K... ;
X,Y: Hole position
Z: Distance from point R to bottom of the hole
R: Distance from the initial level to R level
P: Dwell time at bottom of the hole and at point R when a return is made
F: Cutting feedrate
K: Number of repeats (if required)
Spindle CW
Spindle stop
Fig. 4-17
Explanations
Rapid traverse is carried out to point R after positioning along the X and Y axes.
Tapping is carried out from point R to point Z. The spindle is stopped, and a dwell is
performed once tapping has been completed. Then the spindle is rotated in reverse
direction. The tool is retracted to point R, and the spindle is stopped. Subsequently,
rapid traverse to the initial level is carried out. The feedrate override and the
spindle override are supposed to be 100% while tapping is being carried out.
Yet the rotation speed during retraction can be controlled through GUD _ZSFI[2].
Example: _ZSFI[2]=120, the retraction is performed at 120% of the tapping speed.
4-118
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
G84 (G98)
Spindle stop
Initial level
Spindle
P
stop
Point R
Point Z
P
Spindle CCW
Rigid tapping (G84)
G84 (G99)
Spindle stop
Spindle CW
P
Point R level
Point R
Point Z
P
Spindle stop
© Siemens AG 2007 All rights reserved
04.07
Spindle stop
Spindle CCW