上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
- 62 - Specialized, Concentrated, Focused
5 Appendix
5.1 Back to Machine Zero (Back to Reference Point)
Machine Zero (also called machine origin, home) is the datum mark of MCS (machine coordinate
system). The process of returning to machine zero, varying with different machine structures & control
software versions, is achieved via the execution of a block of G codes.
―Back to Reference Point‖ is a process to synchronize local coordinate system with actual external
coordinate system via control system. In other words, since the system does not know the concrete
position of each axis after start-up, it will control the motion of each axis and detect the switch signals
pre-installed on each axis during the motion (the control system has already known the installation
position of these switches). Thus, once these switch signals are found, the system will learn that the
machine tool has reached the predetermined position and then set the coordinates of this position as
current coordinates, namely, the local coordinate system is synchronous with the actual one.
Generally, these switches are installed at the position of machine zero, i.e. ―Back to Machine Zero‖
equals to the term ―Back to Reference Point‖ in our system. Home switches are also allowed to be
installed at other locations.
The principle of returning to REF. point can be divided into two types—with encoder feedback and
without encoder feedback.
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