TOMATECH AUTOMATION
chapter is based on theTAC-1002T standard PLC program!
Chapter 9 Zero Return Operation
265
Ⅱ Operation
Note 1: The tool offset is not changed for the program zero return operation, if there is offset, the
return
position is the point set by G50.
Note 2: Whether the key is held on at program zero return is defined by the bit parameter No.011
BIT2 (zero
return is locked automatically).
9.2 Machine Zero Return
9.2.1 Machine Zero
The machine coordinate system is a reference coordinate system for CNC coordinate
operation. It is an inherent coordinate system of the machine. The origin of the machine
coordinate
system is called machine zero (or machine reference point). It is defined by the zero or
zero return
switch fixed on the machine. Usually this switch is fixed at the positive stroke point of each
axis.
9.2.2 Machine Zero return steps
1. Press key, it enters the Machine zero mode, the bottom line of the window displays
“REF”:
2. Press , , , or key to return to the machine zero of X, Z, Y, 4th or C
axis;
3. The machine axis returns to the machine zero via the deceleration signal, zero signal
detection. At the machine zero, the axis stops, and the corresponding machine zero return
completion
indicator lights up.
Note 1: If there is no machine zero on the machine, the machine zero operation is forbidden;
Note 2: The machine zero finish indicator is gone out on condition that: 1)The axis is moved out
from
machine zero; 2) CNC is powered off.
Note 3: After the machine zero operation, the tool length compensation is cancelled by CNC;
Note 4: Parameters related to machine zero return are referred to INSTALLATION and
CONNECTION.
Note 5: After the machine zero return is executed, the original workpiece coordinate system is set
again with
G50.
266
Ⅱ Operation
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