Siemens SINUMERIK 840D sl Function Manual page 776

K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
TOFRAME or TOROT defines frames whose Z direction points in the tool direction. This definition
is suitable for milling, where G17 is usually active. However, particularly with turning or, more
generally, when G18 or G19 is active, it is desirable that frames which will be aligned on the X
or Y axis, can be defined. For this purpose, the following commands are available in G group
53:
● TOFRAMEX, TOFRAMEY, TOFRAMEZ
● TOROTX, TOROTY, TOROTZ
The appropriate frames can be defined with these commands. The functions of TOFRAME and
TOFRAMEZ or of TOROT and TOROTZ are identical to one another.
The frames resulting from TOROT or TOFRAME can be written in a separate system frame
($P_TOOLFR). The programmable frame is then retained unchanged.
● Requirement: MD28082 $MC_MM_SYSTEM_FRAME_MASK, bit 3 = 1
When programming TOROT or TOFRAME, etc. response is identical, with or without a system
frame. Differences occur when the programmable frame is processed further elsewhere.
Note
In new systems, it is recommended that only the intended system frame is used for frames
produced by the commands of G group 53.
Example
TRANS is programmed after TOROT. TRANS without specified parameters deletes the
programmable frame. In the variant without a system frame, this also deletes the frame
component of the programmable frame produced by TOROT, but if the TOROT component is in
the system frame, it is retained.
TOROT or TOFRAME, etc. are disabled with language command TOROTOF. TOROTOF deletes
the entire system frame $P_TOOLFR. If the programmable frame (old variant) and not the
system frame is described by commands TOFRAME, etc. TOROT only deletes the rotation
component and leaves the remaining frame components unchanged.
If a rotating frame is already active before language command TOFRAME or TOROT is activated,
a request is often made that the newly defined frame should deviate as little as possible from
the old frame. This is the case, for example, if a frame definition needs to be modified slightly
because the tool orientation cannot be set freely on account of Hirth-toothed rotary axes. The
language commands uniquely define the Z direction of the new frame.
Frame definition for TOFRAME, TOROT and PAROT
The following machine data can be used to select one of two variants for the position of the X
axis and Y axis. However, in both cases there is no reference to the previously active frame.
MD21110 $MC_X_AXIS_IN_OLD_X_Z_PLANE (coordinate system for automatic frame
definition)
For this reason, it is recommended that the following setting data be used instead so that the
behavior of TOFRAME and TOROT can be specifically controlled.
776
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions