Updating Legacy Drawings
Updating Legacy Drawings
(OP)
Is it common practice to update drawings that go through ECO/DCO to current standards? For example, if you have older drawings that are using ANSI Y14.5M-1982, should they be updated to meet ASME Y14.5M-1994 standards?
There are a lot of factors to be considered, not just updating for the sake updating. I think as long as the standard being used is identified on the drawing, there is no real reason to update. Am I way off base?
There are a lot of factors to be considered, not just updating for the sake updating. I think as long as the standard being used is identified on the drawing, there is no real reason to update. Am I way off base?
"But what... is it good for?"
Engineer at the Advanced Computing Systems Division of IBM, 1968, commenting on the microchip.
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RE: Updating Legacy Drawings
RE: Updating Legacy Drawings
RE: Updating Legacy Drawings
I agree with CorBlimey that we all should be working from the same page, but as long as we know what standards to use, there should be no problem interpreting older drawings until such time they are updated.
RE: Updating Legacy Drawings
Next question becomes, if making necessary changes to an old drawing, do you make the changes to the old standard, or the current standard?
RE: Updating Legacy Drawings
We use a rule if there have been no problems during QA/QC processes, then nothing further needs to be added to the drawing. But this also takes into account that we have been, or will continue to use know vendors that are familar with our parts and requirements. The arguement can be made that there is no guarantee that Purchasing will not use different vendors to save $.05, and that all information on any drawing should be up to industry standards, not just our corporate standards.
"But what... is it good for?"
Engineer at the Advanced Computing Systems Division of IBM, 1968, commenting on the microchip.
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: Updating Legacy Drawings
RE: Updating Legacy Drawings
As a rule I always demanded that if it is necessary to redraw a part drawing a test batch should be manufactured from the new drawing and then all dimmensions should be checked and qualified to the new and the old drawing both. After that the parts should be assembled and go through the qualifications tests before the new drawing is approved.