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01/2008 "Program" operating area
6.7 Free contour programming
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© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition 6-303
Additional information
If the straight line that was generated with close contour is linked to
the start element of the contour with a radius or chamfer, the radius or
chamfer must be specified explicitly as follows:
• Close contour, input key, enter radius/chamfer, accept element.
The result then corresponds exactly to what would occur if the
closing element were to be entered with the radius or 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.
Input switchover:
Cartesian/polar
Once a pole has been set – whether inserted at the starting point or
subsequently – the contour elements can be entered as:
- Circular arcs
- Straight lines/(inclined)
or as polar coordinates. To switch between
Cartesian and polar coordinates 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 no poles exist. Input fields and display
fields are then only available for Cartesian values.
Absolute/incremental input
Absolute and incremental polar coordinates can be input for "polar".
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.
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