I would like to create a mapping rule that NX just finds Diameters with a second decimal place.
For example: 16,03 when its a 16,2 Diameter NX should not find the feature.
Is there a function where i can define that?
Probably you will not be able to do it directly with a mapping rule.
You can create a TCL custom function to do that and afterwards use it in a mapping rule.
I would suggest to read through the entire MKE help to get an overview of what is possible.
Since the MKE help is more a tutorial you should go through the examples and try them, so you get a better feeling. Taking a MKE class is more or less mandatory if you like to get into it deeper.
You should create your own function library on the functions tab and place your Tcl functions there.
Reading the MKE help is a good start here too.Hope this helps as a start.
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NX Customization - Best Practice Guide
Muddi, follow the advice of Stefan Pendl.
Reading the MKE Training manual will give you an overview of the MKE capabilites. The document is merely introductory but it will help you to get in touch with the MKE.
A function is a TCL code that allows you to do anlysys, calculus, filter, whatever you want... of data that you cannot do directly in a Machining Rule, Mapping Rule or Add on.
You can find more information about this in the Chapter 6 "External Functions using TCL" of the MKE training manual.