CNC Twelve experiences in NC machining-11

4. How to determine the tool setting point is more reasonable? What is the relationship between workpiece coordinate system and programming coordinate system?1. The tool setting point can be set on the of the machined part, but note that the tool setting point must be the reference position or the part that has been finished. Sometimes the tool setting point is damaged after the first process, which will make it impossible to find the tool setting point in the second process and after, Therefore, during tool setting in the first process, pay attention to set a relative tool setting position where there is a relatively fixed dimensional relationship with the positioning datum, so that the original tool setting point can be retrieved according to the relative positional relationship between them. This relative tool setting position is usually set on the machine tool workbench or fixture. The selection principles are as follows:

1) Alignment is easy.

2) Programming is convenient.

3) Small tool setting error.

4) The inspection during processing is convenient and can be checked.

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