Siemens Sinumerik 840D Operating Turning page 529

Various
5.3.4 Changing the program settings
1. In the operating area "Program", within the operating
mode "JOG, "MDA, or "AUTO", press the HSK 1.6
"Various".
2. Press the VSK 1 "Settings".
The window for the "Settings" opens.
3. If desired, change the graphic view in the parameter
window by pressing the VSK 2 "Graphic view".
4. Enter the parameters for retract, tool change point,
safety distance, speed limits or machining sense.
(see parameterlist in section 5.3.2).
5. Confirm your inputs by pressing the VSK 8 "Accept"
or abort by pressing the VSK 7 "Cancel".
A new program block "Settings" is inserted into the
work plan (similar to the picture below).
5.4 Counterspindle
If your turning machine has a counterspindle, you can machine workpieces
using turning, drilling and milling functions on the front and rear faces with-
out reclamping the workpiece manually.
Before machining begins on the rear face, the counterspindle must grip the
workpiece, remove it from the main spindle and move it to the new machin-
ing position.
You can program these operations with the "Counterspindle" function.
The following functions are available for the counterspindle programming:
Gripping: Gripping the workpiece with the counterspindle (with limit
stop if necessary, see section 5.4.3). ShopTurn first synchronizes the
main spindle and counterspindle. The counterspindle then moves to-
wards the workpiece at rapid traverse to the programmed position ZR
and then continues at reduced feedrate FR to transfer position Z1.
Whether it is the front edge or stop edge of the counterspindle that
moves up to the position is defined in the "Spindles" screen form
(see counterspindle settings).
Pulling: Pulling the workpiece out of the main spindle with the counter-
spindle (see section 5.4.4). The counterspindle pulls the workpiece out
of the main spindle by amount Z1. ShopTurn shifts the coordinate sys-
tem accordingly and saves the offset in the selected work offset.
Rear side: Moving the workpiece with the counterspindle to the new
machining position (see section 5.4.5). The counterspindle moves with
the workpiece at rapid traverse to the new machining position ZW. The
workpiece zero moves too and shifts by ZV (with sign) from the front
face to the rear face of the workpiece. The coordinate system is then
transposed into a mirror image for machining on the rear face and
saved in the selected work offset. Synchronous operation of both spin-
dles is disabled. The counterspindle is now the master
840D/828D SINUMERIK Operate
Section 5
Notes