HEIDENHAIN TNC 640 User Manual page 146

4
Basic coordinate system B-CS
The basic coordinate system is a 3-D Cartesian coordinate system.
Its coordinate origin is the end of the kinematics model.
The orientation of the basic coordinate system in most cases
corresponds to that of the machine coordinate system. There may
be exceptions to this if a machine manufacturer uses additional
kinematic transformations.
The kinematic model and thus the position of the coordinate
origin for the basic coordinate system is defined by the machine
manufacturer in the machine configuration. The user cannot modify
the machine configuration values.
The basic coordinate system serves to determine the position and
orientation of the workpiece coordinate system.
Soft key Application
The user determines the position and orientation
of the workpiece coordinate system by using a 3-
D touch probe for example. The control saves the
values determined with respect to the basic coordi-
nate system as BASE TRANSFORM. values in the
preset management.
The machine tool builder configures the
BASE TRANSFORM. columns of the preset management
in accordance with the machine.
Further information:
Danger of collision!
Your control may feature an additional pallet preset table,
depending on the machine. In this table the machine tool builder
can define BASE TRANSFORM. values that take effect before
the BASE TRANSFORM. values you specify in the preset table
become effective. The PAL tab of the expanded status display
indicates whether a pallet preset is active, and which one. Since
the BASE TRANSFORM. values of the pallet preset table are
neither visible nor editable, there is danger of collision during all
movements!
Refer to the machine tool builder's documentation
Use pallet presets only in conjunction with pallets
Check the display of the PAL tab before you start machining
146
"Managing presets", page 689
NOTICE
Fundamentals, File Management | Fundamentals
W-CS
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
B-CS