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1.2.4 Definition of Shifts
To write a part programme, the programmer chooses a programme origin.
The programme origin is generally a starting point for dimensional measurements on the part drawing.
OP :
The operator sets the programme origin (OP) as shown below:
Op :
He sets (for each axis) a known, accessible point on the part, called the part origin (Op). This may be the
same point as the programme origin.
Part datum shift (Op/OM) = DAT1
It is possible to set the DAT1 and DAT2 values from the part programme.
Programme datum shift (OP/Op) = DAT2
Shifts on the Z axis
Z
X
Op
OP
Z
OM
Z DAT1
Z DAT2
Spindle reference
Setting
equipment
Part
Spindle axis
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