Siemens SINUMERIK 840D Programming Manual page 168
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Milling Cycles
3
3.12 Path milling - CYCLE72
_VARI (machining mode)
You can define the type of machining with parameter
_VARI. For possible values, see "Parameter
CYCLE72".
If another value has been programmed for
parameter _VARI, the cycle is aborted after alarm
61002 "Machining type incorrectly defined" is
output.
_RL (travel around the contour)
Parameter _RL is set to define how the tool must
travel around the contour, i.e. along the center path
or on the left or right-hand side with G40, G41 or
G42. See "Parameter CYCLE72" for possible
settings.
_AS1, _AS2 (direction of approach/approach travel,
direction of retraction/retraction travel)
With the parameter _AS1 you can specify the approach
travel and with _AS2 the retraction travel. For possible
values, see "Parameter CYCLE72". If _AS2 is not
programmed, then the behavior programmed for the
approach path will apply to the return path.
The flexible approach of the contour along a 3-D path
(helix or straight line) should be programmed only if the
tool is suitable and not yet engaged.
With center path travel (G40), tool must approach and
return along a straight line.
_LP1, _LP2 (length, radius)
Parameter _LP1 is set to program the approach path or
approach radius (distance between tool outer edge and
contour starting point) and _LP2 to program the return
path or return radius (distance between tool outer edge
and end point of contour).
Parameters _LP1, _LP2 must be set to >0. A setting
of zero generates error message 61116 "Approach
or retract path=0".
When G40 is programmed, the approach or retract path
corresponds to the distance between the tool center
point and the starting or end point of the contour.
3-168
Contouring on the right or left
_AS1/_AS2
_
_AS1/_AS2
_AS1/_AS2
Contouring in the center
_AS1/_AS2
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
12.98
3
Approach/retraction to/from
the contour with straight line
Approach/retraction from
the contour in quadrant
Approach/retraction to/from
the contour in semi-circle
Approach/retraction to/from
the contour with straight line
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