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O.T. Revision changes

Slightly off topic but, I am wondering if most of you make a revision change to a higher level assembly or weldment when a sub-component is revised? I work for a job shop and some of our customers do make a rev level change and some do not (and quite a few are not consistent) when changing sub-components.

In general, I normally don't change the higher level revision, unless by changing a component a functional change has been made to the weldment or assembly - adding a new feature, changing the application, etc.

Your thoughts are welcome, and if anyone knows if a standard covers this it would be welcome as well. We are in pursuit of ISO registration and are reviewing our rev control process, and debating whether to use internal revisions as well as the customer revisions to control documents. We also got bit by this from a major customer who changed material coating on components without processing an ECN. The parts are painted and we only recently found out they were changed from plain steel to a paintgrip galvanize.

Thanks for any input, Diego

Reply to
Diego
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The rule is form-fit-function (f/f/f) in conjuction with interchangeability. If your lower level changes affect the form-fit-function of the higher level assembly, then you need to revise the higher level assembly, otherwise do not revision the higher level assembly. Be sure to understand how you want to implement this rule. Some may apply this rule to mean that only actual f/f/f changes to the higher level assembly will trigger its revision. Others may say that simplying affecting the f/f/f triggers the revision. ("Affecting" being a broader category than "changing")

Interchangeability goes into whether to pull new part numbers or not. If at any level your revision is not interchangeable with previous revisions and visa versa, then the new revision of the part should have a new part number.

The company I work for is ISO reg, and I've written a pretty good revision control procedure for it that covers this. If you are interested, I'll email you some of the wording.

Matt

Reply to
fcsuper

The rule is form-fit-function (f/f/f) in conjuction with interchangeability. If your lower level changes affect the form-fit-function of the higher level assembly, then you need to revise

the higher level assembly, otherwise do not revision the higher level assembly. Be sure to understand how you want to implement this rule. Some may apply this rule to mean that only actual f/f/f changes to the higher level assembly will trigger its revision. Others may say that simplying affecting the f/f/f triggers the revision. ("Affecting" being a broader category than "changing")

Interchangeability goes into whether to pull new part numbers or not. If at any level your revision is not interchangeable with previous revisions and visa versa, then the new revision of the part should have

a new part number.

-Matt

Reply to
fcsuper

Just as followup, here's the definitions I've pulled together for fff:

Form, Fit, or Function (FFF) - Characteristics of physical items. Form - Item material, composition, or general shape. Fit - Item size, mating, mounting, attachment, or connection. Function - Item purpose, operation or performance (such as: method of use, operating range, safety, compatibility, reliability, accuracy, etc).

Reply to
fcsuper

Thanks Matt. That's what I was looking for.

fcsuper wrote:

Reply to
Diego

One of the things I have had to do in the past was to include the revision in BOM's of the pieces parts. Unfortunately, doing this forces you to revise the entire assembly chain from the lowest component revised. It's tedious, but frankly is the only real way of keeping track of revisions without a PDM.

chris

Reply to
cdubea

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