上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
4 Specialized, Concentrated, Focused
Machine Origin (MO) and Machine Reference Point (REFER) of
Machine Coordinate System (MCS)
MCS is the intrinsic coordinate system of machine tool. Known as machine origin or machine
zero point, or home position, the origin of MCS is confirmed and fixed after designing, manufacturing
and tuning of machine. The CNC device doesn’t know where machine origin is when power on, and
the mechanical stroke of each coordinate axis is limited by maximum and minimum limit switch. To
correctly set MCS at machining, we normally set a machine REFER point (the initial point of
measurement) within the stroke range of each coordinate axis. After starting the machine, it is
necessary to back to REFER point manually or automatically so as to create the MCS. The REFER
point can coincide with MO or not. If not, the distance from machine REFER point to MO can be set by
parameter setting. After the machine returns to the REFER point, the machine origin, which is the
reference point of all coordinate axes, is confirmed, so the MCS is established. The stroke of MCS is
defined by the machine tool manufacturer, while the valid stroke of MCS is defined by software limit.
The relationship between machine origin (OM), machine REFER point (Om), the mechanical stroke
and valid stroke of MCS is as shown in Fig. 2-3.
Mechanical Stroke along X-axis (Limit)
Valid Stroke along X-axis
Valid Stroke along Y-axis
Mechanical Stroke along Y-axis
Fig. 2-3 Machine Origin OM and Machine REFER Om
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