Datum Shift

I received a report from a vendor where they are showing everything on a part 100% in tolerance. I have checked the part myself and show quite a few things out of tolerance. On their report I noticed a term "DATUM SHIFT" and some variables "X,Y,Z", etc. just before each dimension is reported. My question is this, What exactly is "DATUM SHIFT" and what is it doing? Is there some kind of data manipulation going on here?

Parents

dwade over 14 years ago

I have seen folks use "datum shift" as bonus tolerance and just increase the TP tolerance.
That is not correct. It could be that your vendor is doing that. It is not uncommon.
You need to educate yourself about this completely and then re-evaluate those reports.

+1 Have seen many, many ppl here at work doing the same because they didn't know different. Educating yourself and others in this area will benefit your position tremendously.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Reply

dwade over 14 years ago

I have seen folks use "datum shift" as bonus tolerance and just increase the TP tolerance.
That is not correct. It could be that your vendor is doing that. It is not uncommon.
You need to educate yourself about this completely and then re-evaluate those reports.

+1 Have seen many, many ppl here at work doing the same because they didn't know different. Educating yourself and others in this area will benefit your position tremendously.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel

Children

No Data