Siemens SINUMERIK 840D sl Function Manual page 902

Detailed description
2.4 Frames
Programming with MOVT is independent of the existence of a toolholder that can be oriented.
The direction of the motion is dependent on the active plane.
It runs in the directions of the vertical axes, i.e., with G17 in Z direction, with G18 in Y
direction and with G19 in X direction. This applies both where no orientational toolholder is
active and for the case of an orientational toolholder without rotary tool or with a rotary tool in
its basic setting.
MOVT acts similarly for active orientation transformation (345axis transformation).
If in a block with MOVT the tool orientation is changed simultaneously (e.g., active 5axis
transformation by means of simultaneous interpolation of the rotary axes), the orientation at
the start of the block is decisive for the direction of movement of MOVT.
With an active 5-axis transformation, the path of the tool center point (TCP) is not affected by
the change of orientation, i.e., the path remains a straight line and its direction is determined
by the tool orientation at the start of the block.
If MOVT is programmed, linear or spline interpolation must be active (G0,G1, ASPLINE,
BSPLINE, CSPLINE). Otherwise, an alarm is produced.
If a spline interpolation is active, the resultant path is generally not a straight line, since the
end point calculated by MOVT is treated as if it had been programmed explicitly with X, Y, Z.
A block with MOVT must not contain any programming of geometry axes (alarm 14157).
118
Basic logic functions: Axes, coordinate systems, frames (K2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0