Siemens sinumerik 840d Programming Manual page 143

08.97
4
840D 840D
NCU 571 NCU 572
NCU 573
If a full circle describes the protection zone, it must
be divided into two half circles. The order G2, G3 or
G3, G2 is not permitted. A short G1 block must be
inserted, if necessary.
The last point in the contour description must
coincide with the first.
External protection zones (only possible for
workpiece-oriented protection zones) should be
defined in the clockwise direction.
For dynamically balanced protection zones
(e.g. spindle chucks) you must describe the
complete contour (and not only up to the center of
rotation!).
Tool-oriented protection zones must always be
convex. If a concave protected zone is desired, this
should be subdivided into several convex protection
zones.
The following must not be active while the protection
zones are defined:
• Cutter radius or tool nose radius compensation,
• Transformation,
• Frame.
Nor must reference point approach (G74), fixed
point approach (G75), block search stop or program
end be programmed.
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition
4.1 Defining the protection zones CPROTDEF, NPROTDEF
FM-NC 810D 840Di
Protection Zones
Convex protection zones
F
Concave protection zones (not permitted)
4
4-143