3 Directions of Movement, Dimensioning 05.91
3.11 Scale modification G50, G51
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• Scale factor (channel-specific) and reference point are displayed on
the screen under ”SETTING DATA”
• The scale modification is enabled for the appropriate axis by setting
data 560*, bit 2.
• The distance “B” or “U” in the approach/retraction block of the “Soft
approach and retraction from the contour” function is not subjected
to the scale factor.
• Both axes for the plane must be programmed in the first traversing
block after G51.
3.12 Reference point approach with synchronization by program G74
The function “Reference point approach with synchronization by program” can be used to
approach with a real axis the reference point of the programmed axis from a part program.
An axis name must be programmed after G74 (e.g. G74 X L
F
).
Programming in part program:
• NC Stop is not executed if G74 is active
• G74 reference point approach by program
• G74 is active block-by-block
• G74 is linked to an “empty buffer” (@ 714) . This function is triggered internally by block
preparation.
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Only one axis must be programmed in a block containing G74.
Note:
After programming of G 74 the axis must once be programmed with G90 if compensating
values have previously been allowed for (zero offset, tool offset ...).
3–28
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02
SINUMERIK 880, (PG)