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Siemens SINUMERIK 840D Operator's Manual Page 211

Computerized numerical control system for machine tools.
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6
03.04
Alter-
native
Accept
element
Abort
Cartesian start point
Accept
element
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
6.5 Free contour programming
When entering a contour, begin at a position which you know and
enter it as the starting point. You can enter Cartesian or polar
coordinates.
To define the geometry axes, choose from the planes G17, G18 and
G19 with the Select Key in the field behind "Plane selection". The
coordinate system changes accordingly.
The default tool axis (defined in the machine data) can be changed for
machines with more than two axes. The associated start point axes
are automatically adjusted.
Position the cursor on the "Facing axis dimension" field and click on
the field using softkey "Alternative" (or with the "Selection" key)
repeatedly until the dimension you require is displayed.
The approach motion to the starting point can now be changed from
G0 (rapid traverse) to G1 (linear interpolation) via the new field
"Approach starting point".
You can define a specific feed rate for G1 via the "Free text input"
field,
e.g. G95 F0,3.
Select softkey "Accept element" to store the starting point.
With the "Abort" softkey, your settings are discarded and you arrive at
the previous screen form.
Select the machining plane.
Enter the starting point for the contour.
Enter any additional commands in G code format, as required.
Press the "Accept element" softkey.
Enter the individual contour elements (see Section "Create contour
elements").
Program Operating Area
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