Siemens SINUMERIK 808D Programming And Operating Manual page 138

Note
Address Q (gear change at the base of a drilled hole) is a modal value that is stored in fixed cycles. Please ensure that this
address is also used as interface for the cycles G73 and G83!
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 USER DATA, _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
None.
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.
138
G17
+X
-X
+Y
-Y
G18
+Z
-Z
+X
-X
Programming and Operating Manual (ISO Turning/Milling)
G19
+Y
-Y
+Z
-Z
01/2017