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5.2 Preparation for Machining
5.2.1 Part setting with Respect to the Machine
During machining, the CNC takes into account the position of the part with respect to the machine.
To provide the CNC with this set up information, generally requires shifts to be entered (See 1.2.4) between the
measurement origin and:
- the part origin ( ) and the programme origin ( ),
- the center of rotation of the index table and the programme origin (off-centering) for milling machines fitted with
index table.
Setting the part with respect to the machine allows the part programme to be used:
- on different machines,
- irrespective of the way the part is mounted on the index table.
The part origin shift can be acquired semi-automatically or entered via the keyboard.
A scaling factor may also be included in these setting if the part has to be machined using dimensions other than those
which have been programmed.
The shifts entered are stored in memory when the CNC is switched off. Therefore, it is unnecessary to re- enter them
each time the machine is switched on.
REMARK The part settings with respect to the machine can be modified by a part or PLC
programme. The user must bear this possibility in mind and re-execute a
measurement origin setting if required.
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