huangyhg

asme part's list standard
i am trying to find the asme y standard that governs replacing find numbers vs not replacing find numbers. i have found very open standards in global that basically state when you are changing fit, form, or function then you need a new find number on your parts list. how about when you are just changing a screw length? you just change the part no. and nomenclature then roll the rev on your drawing.
does anyone know the asme standard that states this?
thanks
if i understand your question it's more about whether to revise than about parts lists.
asme y14.100 probably gives the most explicit explanation of when a new part number is assigned rather than a new revision. i have the 2004 standard in which 6.8.1 is the relevant section.
my summarized version is if the part after the change is completely interchangeable with the old part (think the 2 parts could be put in a bin and either used), then it's a rev change. otherwise, it's a new pn, however, due to the effort sometimes required in changing part numbers many places do not follow this to the letter all the time.
new pn may be required not just by physical interoparability but by being able to trace parts/when a change was cut in. for instance, say a treatment was changed from cadmium to say zinc for environmental or health & safety reasons. while the parts are still physically interchangeable, it may be necessary to be able to tell them apart for other reasons.
i have previously posted exerpts from this section, if not in this forum then over on
i am talking about a find no. on a parts list of an assembly drawing.
say you have block (find no 1) being screwed to base (find no 2) by screw (find no 3).
the screw changes from .5" to 1", but is still a 1/4 screw/bolt.
do you make it find no 4, and put deleted in the nomenclature of what was find no 3? or do you just replace the part no/nomenclature of find no 3 to reflect this change and roll the rev of the drawing (and the final or top level assembly)?
oops, i think i mis-read your question first time. i'm sure a similar question came up before, if not on this forum then maybe on
thanks

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