Dt And Dam (Dwell Time And Path Length); _Vrt (Lift) - Siemens SINUMERIK 840D Programming Manual

03.96
12.98
4

DT and DAM (dwell time and path length)

With these two parameters you can program an
interruption in the individual roughing cuts after a
defined path for the purposes of chip breaking.
These parameters only apply to roughing. In
parameter DAM you define the maximum path after
which chip breaking is to be performed. In DT you
can also program a dwell time to be included at each
of the interruption points. If no path has been
specified for cut interruption (DAM = 0), then
uninterrupted roughing cuts without dwell times are
generated.

_VRT (lift)

With SW 4.4. and later, the amount by which the tool
is lifted off the contour in both axes during roughing
operations can be programmed in parameter _VRT.
When _VRT=0 (parameter is not programmed), the
tool is lifted off by an amount corresponding to tool
nose radius+1mm (as in earlier SW versions).
Further notes
Contour definition
The contour is programmed in a subroutine whose
name is defined as a parameter.
The contour subroutine must contain at least 3 blocks
with movements in both axes of the machining plane.
The machining plane (G17, G18, G19) is set in the main
program before the cycle is called or applied according
to the basic setting of this
G group on the machine. It cannot be altered in the
contour subroutine.
If the contour subroutine is shorter, alarms 10933 "The
contour subroutine contains too few contour blocks" and
61606 "Error in preprocessing contour"
are output and the cycle is aborted.
Relief cut elements can be programmed
consecutively.
Blocks without movement in the plane are not
subject to any limitations.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
4.5 Stock removal cycle – CYCLE95
Interrupted paraxial cut
X
Turning Cycles
DAM
Infeed
movement
G4 G4 G4 G4
4
G1
Z
4-233