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When to update noms?/

Somethingidc

I have been through training and I am still confused on how to use this. After I alter an alignment for example it will ask me if I want to update noms. I always click no because from experience I found it overrides previously programmed nominals. On the other hand I updated an existing program to a new datum scheme, the part had an all over profile that checked bad in the new alignment until I literally re-created the entire profile in the program and now I am wondering if clicking "yes" to update nominals of related dimensions after I changed the alignment would have resolved this. 

So when do I click yes or no to "Do you want to update nominals of related...?"

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    Tagging off of what Hightech said, I often program parts offline and then come on-site to run them or someone else does. Occasionally we will have a part production supplied that has some sort of roadblock that prevents the feature I chose from being in the alignment.

    Recently we had a tank part come in before it was turned +R which means reuse, and it had damage on a feature that the CAD did not show. I setup my basic manual alignment off the top of the turret and it was not level, so I had to choose another plane to call that level back to. In this case I selected a new plane, it was lower than the original choice, and created level off that. It prompted the same above Alignment prompt and I hit yes. After that, you want to ensure your move points/clearance planes are where you want as they will change.

    As for the 2nd prompt about nominal changing, as stated in here it will only be when you want to change the origin of something, otherwise it will not alter the location.

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    Tagging off of what Hightech said, I often program parts offline and then come on-site to run them or someone else does. Occasionally we will have a part production supplied that has some sort of roadblock that prevents the feature I chose from being in the alignment.

    Recently we had a tank part come in before it was turned +R which means reuse, and it had damage on a feature that the CAD did not show. I setup my basic manual alignment off the top of the turret and it was not level, so I had to choose another plane to call that level back to. In this case I selected a new plane, it was lower than the original choice, and created level off that. It prompted the same above Alignment prompt and I hit yes. After that, you want to ensure your move points/clearance planes are where you want as they will change.

    As for the 2nd prompt about nominal changing, as stated in here it will only be when you want to change the origin of something, otherwise it will not alter the location.

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