Variable Dimensions / Part of Production / PPAP Dimensional Report

TPMB4

Quite Involved in Discussions
#1
With PPAP dimension reports what do you do if, as part of the production process, you end up adjusting one dimension to get the others right? The adjustment is needed to make the more important dimensions/criteria right. A significant number will be just outside the tolerances. The product is functionally fit for purpose and would not be noticed by the customer. In fact the last measurement in the Dimension Report is not really needed.

What are the implications if one dimension gets reported as NOK in a Dimension Report? Is it better to leave of the measurement or put it in exactly as it is measured? Perhaps the tolerance is too small and the drawings need changing to reflect this? Perhaps its not worth causing the hassle and just leave it off? I'm sure some companies just make it up too.
 
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Kales Veggie

People: The Vital Few
#2
With PPAP dimension reports what do you do if, as part of the production process, you end up adjusting one dimension to get the others right? The adjustment is needed to make the more important dimensions/criteria right. A significant number will be just outside the tolerances. The product is functionally fit for purpose and would not be noticed by the customer. In fact the last measurement in the Dimension Report is not really needed.

What are the implications if one dimension gets reported as NOK in a Dimension Report? Is it better to leave of the measurement or put it in exactly as it is measured? Perhaps the tolerance is too small and the drawings need changing to reflect this? Perhaps its not worth causing the hassle and just leave it off? I'm sure some companies just make it up too.
Only one real solution:

Change request and update the drawing.

(I would question the reasons why those dimensions are out. CNC? Form tool? Tool design issue? PRogramming issue?. Are you sure there is no fit / form / function issue? How do you know? Do you want to take on that responsibility?
 

TPMB4

Quite Involved in Discussions
#3
Only way it could be guaranteed to be within tolerance is by making it a totally new way with equipment we don't have. Can be done but then becomes a different product with a more expensive production process. Would never get an order that way.

The product is established in other parts and accepted as is. I am sure it is not an issue, hasn't been for probably 15 years. The problem could be the mix of dimensions and weights are not perfectly matching. You could produce wider tolerances to get around it and I bet that would be accepted.

There really is no issue with the part as it is made it is just the reporting of the occasional NOK dimension in the dim report. There are no SC's, HIC's, etc. listed there is a drawing which is used to obtain the important dimensions for us to work to. What are the issues with putting NOK dimensions in the report in the PPAP? What happens and what should happen?
 

Jim Wynne

Staff member
Admin
#4
With PPAP dimension reports what do you do if, as part of the production process, you end up adjusting one dimension to get the others right? The adjustment is needed to make the more important dimensions/criteria right. A significant number will be just outside the tolerances. The product is functionally fit for purpose and would not be noticed by the customer. In fact the last measurement in the Dimension Report is not really needed.

What are the implications if one dimension gets reported as NOK in a Dimension Report? Is it better to leave of the measurement or put it in exactly as it is measured? Perhaps the tolerance is too small and the drawings need changing to reflect this? Perhaps its not worth causing the hassle and just leave it off? I'm sure some companies just make it up too.
You have to be very careful about characterizing dimensional requirements as insignificant and banking on them not being noticed. If the customer lays the thing out and finds a dimensional nonconformity, there's a always a good chance that fit and function will be disregarded and the NC will take on a life of its own. It's almost always best to reconcile these things prior to PPAP submission.
 
D

Dooglas

#5
If you report specifications or characteristics as 'not ok' you would need to indicate on the PSW that parts do not meet design specifications, and usually explain on the PSW why parts did not meet spec. and why parts are being sent to the customer out of spec.
Authorization to ship product with documented non-conformance would require a customer granted deviation and potentially a corrective action in the form of design record or process change to prevent recurrence or the problem.
 

optomist1

A Sea of Statistics
Trusted Information Resource
#6
They must be there for a reason, need to determine among your team/and customer team if they are essential, before making a change or processing a change request...
 

Golfman25

Trusted Information Resource
#7
With PPAP dimension reports what do you do if, as part of the production process, you end up adjusting one dimension to get the others right? The adjustment is needed to make the more important dimensions/criteria right. A significant number will be just outside the tolerances. The product is functionally fit for purpose and would not be noticed by the customer. In fact the last measurement in the Dimension Report is not really needed.

What are the implications if one dimension gets reported as NOK in a Dimension Report? Is it better to leave of the measurement or put it in exactly as it is measured? Perhaps the tolerance is too small and the drawings need changing to reflect this? Perhaps its not worth causing the hassle and just leave it off? I'm sure some companies just make it up too.
Been there. In today's PPAP world you should probably ask for a print change and get it all set right. Could be a can of worms, but that is probably the best course of action these days.
 
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