HEIDENHAIN TNC 620 User Manual page 114

3
Fundamentals, file management
3.1 Fundamentals
Machine coordinate system M-CS
The machine coordinate system corresponds to the description of
kinematics and therefore to the actual mechanical design of the
machine tool.
Because the mechanics of a machine tool never precisely
correspond to a Cartesian coordinate system, the machine
coordinate system consists of several one-dimensional coordinate
systems. These one-dimensional coordinate systems correspond to
the physical machine axes that are not obligatorily perpendicular to
each other.
The position and orientation of the one-dimensional coordinate
systems are defined with the aid of translations and rotations
based on the spindle tip in the description of kinematics.
The position of the coordinate origin, the so-called machine
datum, is defined by the machine manufacturer during machine
configuration. The values in the machine configuration define the
zero positions of the encoders and the corresponding machine
axes. The machine zero point is not obligatorily located in the
theoretical intersection of the physical axes. It can therefore also be
located outside of the traverse range.
Because the machine configuration values cannot be modified by
the user, the machine coordinate system is used for determining
constant positions, e.g. the tool change point.
114
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
MZP
Machine zero point MZP:
Machine Zero Point