Hi,
I have a client who wants to know if there is a standard to define major/minor revisions and how do you determine it using Form Fit Function.
He says everyone uses it but nobody can refer him to a standard reference that spells this out in black and white.
How does your company deal with these issues?
Len
Hello towards you Mr. Len.
The revison of the minor types are if or why the parts can be used in a backwards fashion.
So while the new part can be made to substitute on the old part it is a minor revision to make.
But for to make the major revisions is to make parts that become not backwards campatability.
So when new part is compatible with exsisting already parts it is small revision but if not backward compatible then it became major.
This is the primariey differences to think upon.
Thank you very much please,
Habib
Len, Here are my responses:
ASME Y14.35M-1997 "Revision of Engineering Drawings and Associated Documents" This specification defines evrything you need to know about the Revisions including Form, Fit & Function. Form: The shape, size, dimensions, mass, weight and other physical parameters which uniquely characterize an item. Fit: The ability of an item to physically interface or interconnect with or become an intregal part of another item. Function: The action or actions which an item is designed to perform. Whereever I have worked an EO (Engineering Order) always has a clasification which basically stated a Conditio or Type as in I or II: Type I: Interchangeability, Form, Fit or Function are violated. Type II: No effect on Interchangeability, Form, Fit or Function. Usually clerical error, minor corrections, typos, etc.
If the reference to the above is to the classification, then this is covered in the ASME spec. If this is not what you are referring to then my only other guess would be that they are making reference to Minor/Major Characteristics. If this is the case than they are talking about Quality Inspection Levels or AQL's, for this, see MIL-STD-105. Using this standard, any aspect of any item defined on a drawing can be classified as Minor, Major or Critical
100% inspection required. Hope this clarifies things, .....................................EddiePolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.