Siemens SINUMERIK 840D Operator's Manual page 286

6
"Program" Operating Area
6.5 Free contour programming
Input switchover:
Cartesian/polar
Absolute/incremental
input
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Close contour, input key, enter radius/chamfer, accept element. The
result then corresponds exactly to what would occur if the linked
element were to be entered with the radius/chamfer.
Close contour can only be used for entering contour elements in polar
coordinates if the starting point of the contour was set to polar and
the same pole is still valid at the closing point.
Once a pole has been set, whether inserted in the starting point or
later, the contour elements can be entered as:
- Circular arcs
- Straight lines/(inclined)
or as polar. For the Cartesian/polar switchover, additional toggle fields
are displayed for "Straight line, any" and "Circular arc" in both the
basic contour input view and the view with "All parameters".
A toggle field is not displayed if a pole does not exist. Input fields and
display fields are then only available for Cartesian values.
In the case of "polar", absolute and incremental polar coordinates
can be entered. The input fields and display fields are labeled inc and
abs.
Absolute polar coordinates are defined by an absolute distance to the
pole that is always positive and an angle in the range of 0° ... +/- 360°.
When absolute dimensions are specified, the angular reference is
based on a horizontal axis of the working plane, e.g. X axis with G17.
The positive direction of rotation is counter-clockwise.
If there are several input poles, the definitive pole is the last pole
before the input or edited element.
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
6
03.04
Ó Siemens AG, 2004. All rights reserved