Siemens SINUMERIK 840D Programming Manual page 192

3
Milling Cycles
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3.13 Milling rectangular spigots – CYCLE76 (SW 5.3 and higher)
_STA (angle)
_STA specifies the angle between the 1st axis of the
plane (abscissa) and the longitudinal axis of the spigot.
_CDIR (milling direction)
The machining direction of the spigot is defined in this
parameter.
Under parameter _CDIR the mill direction
• direct "2 for G2" and "3 for G3" or
• alternatively "up-cut milling" or "down-cut milling"
can be programmed. Up-cut milling or down-cut
milling is determined within the cycle via the spindle
direction activated prior to the cycle call.
Up-cut
M3 → G3
M4 → G2
_VARI (machining mode)
You can define the type of machining with parameter
_VARI.
Possible values are:
• 1=Roughing
• 2=Finishing.
_AP1, _AP2 (blank dimensions)
Blank dimensions (e.g. in the case of precast
workpieces) can be taken into account in machining
of the spigot.
The basic size for the length and width (_AP1 and
_AP2) are programmed without sign and their
symmetrical positions around the spigot center
computed in the cycle. The internally calculated
radius of the approach semicircle is dependent on
this dimension.
3-192
Down-cut
M3 → G2
M4 → G3
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Y
_AP1
© Siemens AG, 2002. All rights reserved
3
12.97
04.00
_AP2
X