Siemens SINUMERIK 828D

V1: Feedrates
17.2 Path feedrate F
Basic Functions
1382 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Retraction path
The retraction path can be configured in machine data:
MD21200 LIFTFAST_DIST.
If required, this path in the part program can be changed by writing DILF at any point.
Following an NC reset, the value entered in machine data:
MD21200 LIFTFAST_DIST
(default value) is always active.
Retraction direction
The method for defining the retraction direction is controlled in conjunction with the variable ALF using the
following keywords:
• LFTXT
The plane of the retraction movement is determined by the path tangent and the tool direction. This G code
(default setting) is used to program the response on a fast lift.
For information about ALF programming, refer to:
References:
/PGA/ Programming Guide, Operations Planning
/FB1/ Function Manual, Basic Function; Mode Group, Channel, Program Operation (K1);
Chapter: Asynchronous Subroutines (ASUBs), Interrupt Routines
• LFWP
The plane of the retraction movement is the active working plane selected with G codes G17, G18 or G19. The
direction of the retraction plane is independent of the path tangent. This allows a fast lift to be programmed
parallel to the axis.
These G functions can always be programmed.
The default setting for NC Reset and/or NC Start is specified in machine data::
MD20150 GCODE_RESET_VALUES.
In the plane of the retraction movement, ALF is used, as before, to program the direction in discrete steps of 45
degrees. With LFTXT, retraction in the tool direction was defined for ALF=1.
With LFWP the direction in the working plane is derived from the following assignment:
G17:
X/Y plane
ALF=1
Retraction in X direction
ALF=3
Retraction in Y direction
G18:
Z/X plane
ALF=1
Retraction in Z direction
ALF=3
Retraction in X direction
G19:
Y/Z plane
ALF=1
Retraction in Y direction
ALF=3
Retraction in Z direction