huangyhg

revision letters vs. numbers
i cannot find standards documentation on pre-production vs. production revision labeling. does ansi standards state a lettering vs. numbering preference?
thank you, this website has been very helpful!
not that we have found.
the only thing we have found is if you use letters, you skip i,o,q,s,z since they could look like numbers. we are adapting an alpha revision scheme and ignoring the skipped letter preference; straigh a-z, aa-zz.
"wildfires are dangerous, hard to control, and economically catastrophic."
"fixed in the next release" should replace "product first" as the ptc slogan.
ben loosli
cad/cam system analyst
ingersoll-rand
the closest i find is asme y14.35m. but it does not list anything about numerical revs. at the past few companies i worked at, numerical was always used for pre-production (preliminary) then was released at revision a. we still do this now and is accepted by iso 2000.
chris
sr. mechanical designer, cad
solidworks 05 sp0.1 / pdmworks 05
per ipc (for the printed circuit industry) standard ipc-d-325a 3.8 for preliminary release:
method #1 - use +a, +b, +c, etc.
method #2 - use 1, 2, 3, etc...
steve smith, c.i.d.
product engineer
staco energy products co.
what does the "+" mean?
i have never seen that before.
chris
sr. mechanical designer, cad
solidworks 05 sp0.1 / pdmworks 05
it's the way they differentiate between preliminary (+a, +b, +c,...) and released (a, b, c,...).
steve smith, c.i.d.
product engineer
staco energy products co.
sorry to say, but that is very weird. it's a first.

chris
sr. mechanical designer, cad
solidworks 05 sp0.1 / pdmworks 05
the drm 10th edition states...production release drawings to have letter rev's a, b, c ...pre-release drawings will have rev's as x1, x2, x3...
swcadman
swcadman ,
we use the same x numbers for r and d work and a,b,c for the revs. though the skipped number reference i,o,q,s,z was unknown here...thanks looslib..
-mechantaeus
quote:
work hard and work smart
our records system will only accept number revisions. we have reserved revisions 80+ for r&d and 0-79 for production revisions.
don peckham
i just received an updated spec. x1, x2, etc are prelim/pre-prod/etc, - is for first released, alpha a,b,etc for production. this is industry standard and everyone should follow it.
chris
sr. mechanical designer, cad
solidworks 05 sp1.1 / pdmworks 05

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