Siemens SINUMERIK 840D Programming Manual page 163

3
12.97
_MID (infeed depth)
With this parameter you determine the maximum infeed
depth when roughing.
The depth infeed is performed by the cycle in equally
sized infeed steps.
The cycle automatically calculates this infeed using _MID
and the total depth. The minimum possible number of
infeed steps is used as the basis.
_MID=0 means that the cut to pocket depth is made with
one infeed.
_FAL (final machining allowance at the edge)
The final machining allowance only affects machining
of the pocket in the plane at the edge.
When the final machining allowance ≥ tool diameter,
the pocket will not necessarily be machined
completely. The message
"Caution: Final machining allowance ≥ tool diameter"
is output but the cycle is continued.
_FALD (final machining allowance on the base)
For roughing, a separate final machining allowance is
considered on the base (POCKET1 does not normally
consider any final machining allowance).
_FFD and _FFP1 (infeed depth and plane)
Feedrate _FFD is used for insertion into the material.
Feedrate FFP1 is used for all movements in the plane
traversed at feedrate when machining.
_CDIR (milling direction)
The value for the machining direction of the pocket 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 milling
M3 → G3
M4 → G2
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3.9 Milling rectangular pockets – POCKET3
Down-cut milling
M3 → G2
M4 → G3
3
Milling Cycles
3-163