Adtech CNC9640, Programming Manual

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ADTECH9 Series CNC Programming Manual
Workpiece coordinate system
Workpiece coordinate system:
When start programming, the programmer doesn’t know the position of the workpiece on the machine tool,
and usually uses a point on the workpiece as the reference point to write processing program. The coordinate
system created with this reference point is the workpiece coordinate system. When the workpiece is fixed on
the worktable of the machine tool, move the tool to specified workpiece reference point and set the coordinate
value of this point as the origin of workpiece coordinate system, and the tool will use this workpiece
coordinate system as the reference system and process according to program instruction when the system
executes the machining program. Therefore, the origin offset function of coordinate system is very important
to CNC machine tool.
2.1.8. Programmable workpiece coordinate system (G92)
Function:
This instruction creates a new workpiece coordinate system, so that the coordinate value of the point where
current tool locate is the value of IP_ instruction in this workpiece coordinate system. (As shown in Fig. 8.1)
Format:
(G90) G92 X_Y_Z_;
X

Y_Z_; The coordinate absolute value of every axis
Details:
G92 instruction is a non-modal instruction, but the workpiece coordinate system created with this instruction is
modal.
Actually, this instruction also specifies an offset, which is specified indirectly. It is the coordinate value of new
workpiece coordinate system origin in original workpiece coordinate system; seen from G92 function, this
offset is the difference between the coordinate value of the tool in original workpiece coordinate system and
IP_ instruction value. (As shown in Fig. 8.1)
If G92 instruction is used for several times, the offset specified by G92 instruction will superpose. For every
preset workpiece coordinate system (G54-G59), the superposed offset is valid.
New coordinate system of the part is set in above instruction, e.g. the coordinate value of tool tip is IP_. Once
the coordinates are confirmed, the position of the absolute value instruction is the coordinates in this
coordinate system.

Example:
The coordinates of the tool in original coordinate system are (200, 100), after
executing (G92 X100 Y50):