上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
- 34 - Specialized, Concentrated, Focused
3.3
Returning to Machine Origin
Origin of Machine Coordinate System (inherent coordinate system of machine tool), also called
mechanical origin or mechanical zero, is fixed after design, manufacturing and debugging before
machine tool leaving factory. After startup of control system, it is necessary to execute the operation of
returning to machine origin automatically or manually.
The necessity of returning to machine origin:
These below functions will be available ONLY after returning to machine origin: software limit enabled, setting the
fixed point, and tool change.
The Process of Returning to Machine Origin
The processes of returning to machine origin of X, Y, and Z axes are included and identical, shown
in Fig. 3-4 (taking X-axis as an example).
Is switch distance between fine
positioning and coarse positioning
normal?
Select
“
REF POT
”
mode,
click
“
X Return
”
Beginning of returning to
machine origin of X-axis
X-axis moves towards coarse
positioning direction until detecting
REF. point signal
Has coarse positioning
finished?
X-axis moves towards fine
positioning direction until detecting
encoder zero signal
Has fine positioning
finished?
Check the switch distance
between fine positioning and
coarse positioning
End of returning to
machine origin of X-axis
X-axis moves retracting distance
True
False
False
Adjust the switch distance
between fine positioning
and coarse positioning
Refer to
Chapter 3.3.3
If out of normal range, the system
will display the the alarm prompt.
True
True
Fig. 3-4 The process of returning to machine origin (X-axis)
3.3.1
Principle of Motion of Returning to Machine Origin
The sketch map of returning to machine origin with servo motor is as below:
