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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 6-299
The position of the coordinate system is displayed in the graphics
window.
Contour allowance
Here, you enter the complete description of the allowance parallel to
the contour and the side of the contour on which the allowance
applies.
6.7.5 Symmetrical contours with milling technology
Function
Milling contours are often symmetrical. To exploit the symmetry of
contours only the relevant parts of the contour are input, the
remainder is created through replication.
Symmetries
Closed symmetrical contours can be created through a combination of
mirroring and turning repetitions:
• Mirroring:
The programmed contour can be mirrored in the starting or end
point on any given straight line. In addition, a radius or chamfer
can be entered in the mirroring point.
• Repetition for closed contour:
The mirrored contour can be closed to the left or to the right
through repetition. In addition, a radius or chamfer can be input at
the repetition corner points (similar to closing a contour from the
end point to the starting point).
Example
R20
R15
90
40
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