Siemens SINUMERIK 802D sl Programming Manual page 114

Enhanced Level Commands
4.1 Program support functions (1)
Warning
!
Address Q (shift at the bottom of a hole) is a modal value wich is retained within
canned cycles. Special care has to be taken because it is also used as the depth
of cut in cycles G73 and G83.
Explanations
The spindle is stopped at the fixed rotation position after positioning along the X
and Y axes. The tool is moved in the direction opposite the tip of the tool. Positio-
ning (rapid traverse) is carried out to the bottom of the hole (point R).
Then the tool is shifted into the direction of the tool tip, and the spindle is rotated
clockwise. Boring is carried out in the positive direction along the Z axis until point
Z.
The spindle is stopped at the fixed rotation position again at point Z. The tool is
then shifted into the direction opposite the tool tip, and the tool is shifted back to
the initial level. Subsequently, the tool is shifted into the direction of the tool tip, and
the spindle is rotated clockwise in order to proceed to the next block operation.
To enter a safety clearance, GUD _ZSFR[0] can be applied.
The lift--off path can be specified using _ZSFR[5].
_ZSFR[5] = 1
_ZSFR[5] = 0 or 2
_ZSFR[5] = 3
_ZSFR[5] = 4
G17, lift--off path in --X
G18, lift--off path in --Z
G19, lift--off path in --Y
Therefore, the angle has to be entered to GUD7 _ZSFR[2] in such a way that the
tool tip points in the reverse direction for lift--path after the spindle has stopped.
Example:
If plane G17 is activated, the tool tip has to point into the +X direction.
Axis switching
The canned cycle must be canceled before the drilling axis can be changed.
Boring
Boring is not performed within a block that does not contain X, Y, Z, R, or any addi-
tional axes.
4-114
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) -- 04.07 Edition
G17
+X +Z
--X --Z
+Y +X
--Y --X
G18 G19
+Y
--Y
+Z
--Z
© Siemens AG 2007 All rights reserved
04.07