Using Multiple Revisions of a Print / Drawing

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Helmut Jilling

Auditor / Consultant
#12
Re: Using Multiple Revisions of a drawing

When I have had the situation that we needed to go back to an old revision of drawing, we increased the rev again. In your case, we would go from rev.B to rev.C, even though rev.C is identical to rev.A. This way we maintain our change management record and go through the correct approval process.

As Ted says, if you anticipate that you may need to go back and forth between different revisions in the future, then they should be controlled with different drawing numbers not revisions.

Oh gosh, I don't like that approach at all. It just creates a paperwork nightmare. Rev. C won't match the customer's order which is rev. A. Seems to create more problems than it solves.

What is wrong with the idea of do you want these parts to rev A or B? Maybe put a big mark on the paperwork (circle with a marker) to call attention to it.
 
Q

qualitychic

#13
Re: Using Multiple Revisions of a drawing

I am not sure what the problem is. The expectation is for the organization to use the APPLICABLE revision of a document. If Rev. A of a drawing can be re-used, it should have not been obsoleted.
I'm just going to take a step back few years. If your system is not too sophisticated, you may want to prepare a package for every job. Most companies probably refer it as shop traveler. Basically in this package you will include any APPLICABLE drawing/special instructions for the job. You also request that the customer supply drawing and any special instructions each time they place an order. You will prepare this package everytime you receive the order from your customer.After all...isn't VERIFYING CUSTOMER REQUIREMENTS for every order you receive part of your normal practice? This way you don't have to worry about keeping many different revisions or obsoleting a drawing. I guess...we'll just let the customer worries about it.... :bonk:
 
U

Umang Vidyarthi

#15
Instead of identifying the prints as "obsolete" identify them as "Archived and superseded by (next Rev)".
Possible solution IMHO.

That which is superseded is, by definition, obsolete.
You are absolutely right.In normal practice,every Revision which supercedes the earlier version,renders it's predecessor obsolete.Surely indesputable.But considering the OP's post here,his customer wants a yoyo game;in which case,AL's suggestion comes alive & kicking,and is worthy of consideration.The only other recource is to keep marking all revisions from A to B to C...and so on (though C is already present and available as A).Else,you may keep all of them as independent drawings.

So don't state the superseded part.
Yes 'Archived' alone does the same job. :agree1:

/Umang
 
D

ddunn

#16
O.K. Till today I have not had to do this. This morning my purchasing department asked me what to do in this case. The deal is we had a Rev. A drawing, it was decided that we wanted to add additional bolt holes to this drawing so it was rev'd to B. It has since been decided that oh we dont want the extra holes we want to manufacturing this piece to Rev. A (Which has now been marked obsolete per procedure). Has anyone had to deal with this type of thing in the past. I'm quessing we could run into this again, like if a customer comes back to us and says I need P/N X that fits our system that was built in 1990 say, will that drawing may be Rev. B and we now may be on Rev. D. What happens if the change is enough to affect fit, form, or function and we need to go back to that Rev. B drawing. Any Suggestons would be greatly appreciated.
It sounds like your change review and approval process might be a bit out of control.

A change review process must include evaluation for impact on cost, schedule and interchangeability.

A change may seem like a good idea but when cost an schedule impact are factored in the change may not be worth it.

The rules of interchangeability must be adhered to:
1. the revision is fully interchangeable - revision A or revision B can be used in all applications (think of a blind man in a bin, doesn't matter which revision part is pulled)

2. the revision is backward interchangeable - revision B replaces revision A and all previous revisions in all applications. But revision A cannot be used in place of revision B. Old revisions would be purged from stock.

3 the revision is not interchangeable - revision B will not replace revision A or previous revisions in all applications and revision A cannot be used in place of revision B. This will require a new part number.

Revisions only progress forward. If you need to change the part to the configuration of a previous revision the revision goes up to the next revision even though the two configuration are the same. :2cents:
 
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