Using Multiple Revisions of a Print / Drawing

9

93ramvert

#1
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.
 
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Sidney Vianna

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#2
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.
 
9

93ramvert

#3
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.
It was not expected that this Rev. A would ever be used again. The addtional holes that were added to the drawing was for adding addtional accesories. But now cost has become a factor three months after the Rev. to B and now they want to go back to A.
 
D

Dean Frederickson

#4
Re: Using Multiple Revisions of a drawing

Talk to your customer and ask them for a rev a print. You don't need to obsolete a print when you get a revision change. There will always be a probability that a customer will need a old revision part, to repair an older model that is not currently being manufactured. :2cents:
 
T

Ted Schmitt

#5
Re: Using Multiple Revisions of a drawing

Why not create 3 drawings... that way the customer can order to whatever drawing and you dont have the "confusion" of having 3 revisions for the same drawing to control...
 
D

dna_leri

#6
Re: Using Multiple Revisions of a drawing

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.
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.
 

Wes Bucey

Quite Involved in Discussions
#7
Re: Using Multiple Revisions of a drawing

Wow! A great week for Configuration Management questions (even though OP has not identified it as such.)

As I see it, the question comes down to whether Rev. A or Rev. B may EVER be used again.
  1. If BOTH Rev A and Rev B will be used (according to cost or accessories or other considerations), then the question arises whether the one with the extra bolt holes is interchangeable with the one without for applications that do not have accessories. If yes, then the consideration is one of cost of maintaining and manufacturing two different parts. (i.e. for replacement of a single part or repair, it is just simpler to charge a customer a higher price for the one with extra bolt holes if it will perform the function.) If selling to an OEM, the manufacturing cost factor may dictate manufacturing and selling the version with fewer bolt holes or working out a compromise in price with the OEM.
  2. If EACH version would have large enough sales to justify maintaining both parts, most manufacturers would create a separate part number for each version, running the pertinent part number to fill an OEM order and maintaining an inventory of parts with more bolt holes as repair parts (NOT keeping an inventory of the ones with fewer bolt holes.) Each part number would have a separate Control Plan, eliminating confusion in inspection and inventory. The OEM folks who would purchase the parts with fewer bolt holes would be instructed to buy sufficient to use for repairs and advised that replacements would be filled from inventory of the part number with more bolt holes, since the parts were interchangeable.
  3. If the manufacturer decides that Rev B was a bad idea, and will not manufacture any more, he can WITHDRAW Revision B and reinstate Revision A as the valid revision.
 
Last edited:
J

Jimmy the Brit

#8
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.
I agree - the decision to change to rev B must have required a change control. Rev'ing again also requires a change control, so you must bring in Rev C. The purpose of change control is to track all changes, and this was clearly a change.

Changing from A to B, and then back to A would be a red flag to an auditor, unless you were planning to expunge the change control history in which case la-la-la *I'm not listening* la-la-la
 
G

Geoff Withnell

#9
My training and experience has always been that there are fewer problems if when the changes are sufficient to prevent backward compatability (the new can't replace the old) the part number should be changed. This can be facilitated by using dash numbers. For example, the original part would be XXXX-1, shown on Dwg No. XXXX. If more holes were added, but the original with fewer holes still needs to be maintained, for appearance or strength issues, the new version would be XXXX-2, also on Dwg. No. XXXX. It would even be possible to stock only -1's and convert to -2's as needed.


Geoff Withnell
 
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