Siemens Sinumerik 840D sl Programming Manual page 95

Explanations
The spindle stops at a fixed rotary position after positioning along the X and Y axis. The tool
travels in the direction opposite to that of the tool tip. It is positioned on the bottom of a hole
(Point R) at rapid traverse.
Finally, the tool is shifted in the direction of the tool tip and the spindle is moved with
clockwise rotation. Drilling takes place along the Z axis in the positive direction up to point Z.
The spindles stops at a fixed spindle position after the bottom of a hole is reached. The tool
is returned opposite the tool tip.
The safety clearance can be specified with GUD _ZSFR[0].
The lift-off path can be specified with _ZSFI[5].
_ZSFR[5] = 1
_ZSFI[5] = 0 or 2
_ZSFI[5] = 3
_ZSFI[5] = 4
The angle must therefore be specified in GUD7 _ZSFR[2] in such a way that the tool tip
points at the opposite direction after the spindle stop for the lift-off path.
Example:
If plane G17 is activated, the tool tip must point in direction +X.
Restrictions
Changeover of the axes
Before changing over the drilling axis, one must first deselect the fixed cycle.
Drilling
The drilling cycle is executed only if an axis motion, e.g. is programmed with X, Y, Z or R.
Q/R
Always program Q and R in one block with an axis motion, otherwise the programmed
values will not be stored modally.
Only one positive value is to be specified in each case for the value of Address Q. If a
negative value is specified for "Q", the sign is ignored. "Q" is set as equal to "0" if no lift-off
path is programmed. In this case, the cycle is executed without lifting.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
G17 G18
+X +Z
-X -Z
+Y +X
-Y -X
Additional functions
4.1 Program supporting functions
G19
+Y
-Y
+Z
-Z
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