Siemens SINUMERIK 840D Programming Manual page 162

3
Milling Cycles
3.9 Milling rectangular pockets – POCKET3
Description of parameters
See Subsection 2.1.2. (Drilling, Centering –
CYCLE81) for a description of parameters _RTP,
_RFP, _SDIS
See Section 3.7 for a description of parameter _DP.
See Section 3.2 for cycle setting data _ZSD[1],
_ZSD[2].
_LENG, _WID and _CRAD (pocket length, pocket
width and corner radius)
The shape of a pocket in the plane is determined
with parameters _LENG, _WID and _CRAD.
The pocket can be dimensioned from the center or
from one corner point. When dimensioning from a
corner point, use _LENG and _WID with sign.
If it is not possible to traverse to the programmed
corner radius with the active tool because its radius
is larger, the corner radius of the completed pocket
corresponds to the tool radius.
If the milling cutter radius is greater than half the
length or width of the pocket, the cycle is aborted
and alarm
61105 "Cutter radius too large" is output.
_PA, _PO (reference point)
The center point of the pocket in the abscissa and
ordinate is defined with parameters _PA and _PO.
This is either the pocket center point or a corner
point. The value of this parameter depends on cycle
setting data bit _ZSD[2]:
• 0 means pocket center point
• 1 means corner point
When dimensioning the pocket from a corner, the
length and width parameters must be entered with
sign (_LENG, _WID), thus completely defining the
position of the pocket.
_STA (angle)
_STA indicates the angle between the 1st axis of the
plane (abscissa) and the longitudinal axis of the pocket.
3-162
Pocket dimensioned from the center
Y
_PA
G2
Pocket dimensioned from one corner point
Y
G2
_PA
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3
12.97
_STA
_CRAD
G3
X
G3
X
© Siemens AG, 2002. All rights reserved