Preparatory Functions for Machining
3.7 C axis mode
C axis mode
The spindle must be operated as a C axis if the spindle is to be used
for positioning and machining (e.g. for drilling and hexagonal milling).
In C axis mode, the spindle is operated as a position-controlled rotary
axis. It can then be operated in interpolation with other axes.
• The traversing range in C axis mode ranges from 0° to 359.999°
(absolute), or ± 99 999 999 (incr.).
• You select the display of the C axis position with the "Preset" menu
in the extended soft key menu and the "Display C always" soft key.
The position of the C axis appears in the position display. The C
axis is also offered in the appropriate operating modes (e.g.
STRAIGHT, CONICAL, CIRCLE) as a further input parameter
Programming C-axis mode
To program C-axis mode under EasyStep programming, please
proceed as follows:
PROGRAM mode is selected.
Press the "Special function" and "Auxiliary commands" soft keys.
Set oriented spindle stop
Validate the setting by pressing the soft key "Accept".
Program the end position (100°) of the C axis by means of the "C" soft
key in STRAIGHT mode,
e.g. C = 100
Exit the input screen by pressing the "Accept" soft key.
and the STOP position, e.g. 0°.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/810D Operator's Guide ManualTurn (BAM) – 08.02 Edition