Undercut Forms - Cycle940 - Siemens Sinumerik 840D sl Programming Manual

Programming cycles externally
16.1 Technology cycles
16.1.32

Undercut forms - CYCLE940

Various undercuts can be programmed using the CYCLE940 cycle. In some cases, these
differ significantly regarding the parameterization.
The additional columns in the table indicate which parameters are required for which undercut
type. The correspond to the vertical selection softkeys in the cycle screen form:
• E: Undercut form E
• F: Undercut form F
• A-D: DIN thread undercut (forms A-D)
• T: Thread undercut (free definition of form)
Programming
CYCLE940(REAL _SPD, REAL _SPL, CHAR _FORM, INT _LAGE, REAL _SDIS,
REAL _FFP,INT _VARI, REAL _EPD, REAL _EPL, REAL _R1, REAL _R2, REAL
_STA, REAL _VRT, REAL _MID, REAL _FAL, REAL _FALX, REAL _FALZ, INT
_PITI, STRING[5] _PTAB, STRING[20] _PTABA, INT _DMODE, INT _AMODE)
Parameters
Param Param
No.
Mask intern
1
X0 _SPD
2
Z0 _SPL
3
FORM _FORM
4
POSIT _LAGE
ION
5
SC _SDIS
6
F _FFP
804
Explanation
Prog. for form
E F A-D T
x x x x Reference point in the plane axis (always diameter)
x x x x Reference point on longitudinal axis (abs)
x x x x Form of undercut (capital letters, e.g. "T")
Selection, table from which the undercut values should be taken
A = External, reference DIN76, A = normal
B = External, reference DIN76, B = short
C = Internal, reference DIN76, C = normal
D = Internal, reference DIN76, D = short
E = Reference DIN509
F = Reference DIN509
T = Free form
x x x x Position of undercut (parallel Z)
0 = External +Z: \____|
1 = External -Z: |____/
2 = Internal +Z: /-----|
3 = Internal -Z: |-----\
x x x x Safety clearance (inc)
x x x x Machining feedrate (mm/rev)
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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