Siemens SINUMERIK 840Di sl - Page 300

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"Program" operating area 01/2008
6.7 Free contour programming
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6-300 SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
The relevant (non-symmetrical) part of the contour is described as
standard:
The finished contour is created through mirroring and repetition:
The lines of symmetry are displayed using a dashed line. The mid
point of the created contour is marked with a cross. The symmetry is
only visible on the end point.