True, but again, even if we end up changing supplier, the perpendicularity/run-out requirement is almost certainly going to be an inspection characteristic in the revised customer's drawing, so that does not save me from having to find and implement a reasonable way to check it at goods-in here...
Agreed, but you get what you pay for and cheap parts is the name of the game for our clients.
Nut sides are reasonably perpendicular to the faces.
According to the supplier's 8D the problem lies in a worn tool for threading that had some play, of course the supplier produced another out of...
Not an option, at least post quality incident, you are marked as automotive, so I have to wonder how do you think your proposal would ever pass an MSA.
We need at the very least a form of attribute gauging repeatable enough to pass MSA, but variable gauging would be preferred.
To clarify, the items in question are not locknuts, just standard nuts (general tolerances governed by ISO 4759-1), they are forged and then threaded, the faces are not machined but left as forged.
We had a batch in with extremely poor face perpendicularity (the nuts are visibly not flat when...
But that would compound any perpendicularity error on the bolt as well as form errors on the bolt's thread to the overall results, so would still need a special gage with both parameters guaranteed to very low tolerance.
Thread plug gages (which I have used for CMM measurment in previous jobs)...
What would you consider the best way (from a practical point of view - manufacturing environment) to inspect the perpendicularity or runout of the faces of a nut to the thread's axis?
Thank you all for the informative replies, the fact this callout is ISO codified while at the same time being out of GPS&V is interesting (and somewhat confusing).
In a customer drawing I encountered the following callout:
Now, I consider myself pretty knowledgeable in GD&T but I never encountered this type of callout before and (as far as I am aware) it is not a valid one by ISO or ASME drafting standards.
Before going back to the client asking for more...
