Siemens SINUMERIK 840D sl Function Manual page 906

Detailed description
2.4 Frames
Setting data
SD42980 $SC_TOFRAME_MODE
is, therefore, introduced, which can be used to control the response of TOFRAME and
TOROT.
It can accept values of 0 (inactive) to 3. If the value of the setting data is not zero, the effect
of machine data
MD21110 $MC_X_AXIS_IN_OLD_X_Z_PLANE is overwritten.
The values 1 to 3 have the following meanings:
1:
2:
3:
Characteristics and expansions:
Settings 1 and 2 are reached by rotating the coordinate system around the Z axis, starting
from any position on the X and Y axis, until the desired setting is reached. Setting 3 is
achieved by executing a rotation whose value is the exact mean of these two angles.
However, this only applies for the case that the old and new Z direction enclose an angle of
less than 90 degrees. With variant 1, both the old and new X axes form an angle of under 90
degrees, with variant 2 the same is true of the Y axis (the relevant axes point in
"approximately" the same direction). If the two Z directions form an angle of more than 90
degrees, however, the conditions of an angle < 90 degrees between the old and new axes
can no longer be met simultaneously for both X and Y. In this case, priority is given to the X
direction, i.e., a mean value is taken from the direction for 1 and the negative direction for 2.
If one of the G codes TOFRAMEX,TOFRAMEY,TOROTX,TOROTY is programmed in place of
TOFRAME(Z) or TOROT(Z), the descriptions for adapting the axis directions perpendicular to
the main direction are also valid for the cyclically exchanged axes. The assignments in the
table below are then valid:
Tool direction
(vertical axis)
Secondary axis
(horizontal axis)
Secondary axis
(ordinate)
122
The new X direction is chosen to lie in the XZ plane of the old coordinate system.
In this setting the angle difference between the old and new Y axis will be minimal.
The new Y direction is chosen to lie in the YZ plane of the old coordinate system.
In this setting the angle difference between the old and new Y axis will be minimal.
The value chosen is the mean value of the two settings, which would have been
chosen with 1 and 2.
TOFRAME, TOFRAMEZ
TOROT, TOROTZ
Z
X
Y
TOFRAMEY
TOROTY
Y
Z
X
Basic logic functions: Axes, coordinate systems, frames (K2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
TOFRAMEX
TOROTX
X
Y
Z