Fine Boring Cycle (G76) - Siemens SINUMERIK 802D sl Programming Manual

04.07
Explanations
When using cycle G73 retraction movement is performed in rapid traverse after
each drilling operation. GUD _ZSFR[0] can be used to enter a safety clearance.
The retraction amount for chipbreaking (d) is determined through GUD _ZSFR[1]
as described below:
_ZSFR[1] > 0 Retraction amount as entered
_ZSFR[1] = 0 Retraction amount is always 1 mm or 1 inch with chipbreaking
Infeed is performed by using depth of cut for each cutting Q, which is incremented
by the retraction amount d as of the 2nd infeed.
By means of this drilling cycle a rapid drilling infeed is accomplished. Removal of
the drilling chips is facilitated through the retraction movement.
Note
If is need to specify 0 mm or 0 inch, set a smaller value than the movable resolu-
tion.
Example
M3 S1500;
G90 G0 Z100
G90 G99 G73 X200. Y--150. Z--100. R50. Q10. F150.;
Y--500.;
Y--700.;
X950.;
Y--500.;
G98 Y--700.;
G80;
G28 G91 X0 Y0 Z0; Return to the reference position return
M5;
4.1.3

Fine boring cycle (G76)

Precise boring of a hole is accomplished through the fine boring cycle.
Format
G76 X... Y... R... Q... P... F... K... ;
X,Y: Hole position
Z_: Distance from point R to the bottom of the hole
© Siemens AG 2007 All rights reserved
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
Rotate spindle
Position, drill hole 1, and return to point R.
Position, drill hole 2, and return to point R.
Position, drill hole 3, and return to point R.
Position, drill hole 4, and return to point R.
Position, drill hole 5, and return to point R.
Position, drill hole 6, and return to the initial level.
Cancel canned cycle
Spindle stop
Enhanced Level Commands
4.1 Program support functions (1)
4-99