Siemens SINUMERIK 840Di Function Manual page 799

The workpiece geometry is described by a coordinate system that is formed by the geometry
axes. A channel axis is assigned to each geometry axis and a machine axis is assigned to
each channel axis. An axial frame exists for each machine axis and for each frame (system
frame, basic frame, settable frame, programmable frame). When a new machine axis is
assigned to a geometry axis, the axial frame components of the machine axis, such as
translations (coarse and fine), scales and mirrors of the appropriate frame, are also applied.
The new geometry in the channel is then generated by the new contour frames resulting
from the new geometry axes (up to three in number).
The current valid frames are calculated again on the geometry axis switchover and a
resulting complete frame is generated. The data management frames are not included
unless they are activated.
Example:
The channel axis is to become a geometry axis x through geo axis substitution. The
substitution is to give the programmable frame a translation component of 10 in the x axis.
The current settable frame is to be retained.
MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 1
$P_UIFR[1] = CROT(x,10,y,20,z,30)
G54
TRANS a10
GEOAX(1, a)
Several channel axes can become geometry axes on a transformation change.
Example:
Channel axes 4, 5 and 6 become the geometry axes of a 5axis transformation. The
geometry axes are thus all substituted before the transformation. The current frames are
changed when the transformation is activated. The axial frame components of the channel
axes, which become geometry axes, are taken into account when calculating the new WCS.
Rotations programmed before the transformation are retained. The old WCS is restored
when the transformation is deactivated. The most common application will be that the
geometry axes do not change before and after the transformation and that the frames are to
stay as they were before the transformation.
Machine data:
$MN_FRAME_GEOAX_CHANGE_MODE = 1
$MC_AXCONF_CHANAX_NAME_TAB[0] = "CAX"
$MC_AXCONF_CHANAX_NAME_TAB[1] = "CAY"
$MC_AXCONF_CHANAX_NAME_TAB[2] = "CAZ"
$MC_AXCONF_CHANAX_NAME_TAB[3] = "A"
$MC_AXCONF_CHANAX_NAME_TAB[4] = "B"
$MC_AXCONF_CHANAX_NAME_TAB[5] = "C"
Axis Types, Coordinate Systems, Frames (K2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
; Frame is retained after geo axis
substitution.
; Settable frame becomes active.
; Axial offset of a is also substituted.
; A becomes x axis;
$P_ACTFRAME=CROT(x,10,
y,20,z,30):CTRANS(x10).
Detailed Description
2.4 Frames
2-69