huangyhg

help w/ level iii drawings
i am developing level iii drawings that contain both mil spec and metric hardware. i can't find any info on mil spec metric hardware so i've been told to use iso hardware specs. is it acceptable to use both englich mil spec and iso spec hardware nomenclature on this type of drawing? has anyone has been down this road before? thanks for your time.
sr. pro/e mechnaical designer
check out our whitepaper library.
yes, perfectly acceptable as long as it is clear to which spec you are referring. usually, the call-out for the hardware is a no-brainer, but you may need to add an extra note or two for clarification.
--scott
wow. someone is still doing level iii contractural drawings? i thought that died along with dod-d-1000 and mil std 100.
nope. some of us still have to jump through those hoops!
sr. pro/e mechnaical designer
dosn't level iii have to do with parts for "nondestructive testing"?
(mil-std-410d)
chris
solidworks/pdmworks 08 3.1
autocad 08
yes, if you're talking about parts, but if the subject is drawings.....
what i was most concerned about was top level and sub-assenbly drawings calling out english mil-spec and iso spec hardware.
sr. pro/e mechnaical designer
so long as the hardware is fully described, with reference to a relevant industry/national/international standard, i don's see that it matters if you have some mil spec & some iso.
the point as i always understood it is that another person/organization, using the description provided, can find hardware that is fully equivalent.
then my real military drawing was in the uk to their standards but we would routinely call out hardware from a range of standards including mil std, nas, bs, iso, en... on one drawing.
kenat,
ok. thanks for all the help. this site is a great source for info that's hard to find anywhere. this info is based upon a lot of experience from a lot of individuals in many different engineering fields. thanks again
sr. pro/e mechnaical designer
proeguy-
there are some military standards for metric fasteners but to find a source with reasonable minimum buys and prices may be problematic.
there does exist an unofficial but widely-recognized part numbering that clearly calls out the size, the material type, and the governing spec.
if there was an m4x12 socket head cap screw defined in iso9138 (this is a purely fictional number i am using just for purpose of explanation) and if the standard defined two grades of stainless steel, say a2 for a low strength grade and a4 for a high strength grade then the part number, then one valid part number is m4x12iso9138-a4. this part number nails everything down completely within the confines of the spec. vendors will sell screws to you using this part number and will provide you with certs to the spec as well. this has been my experience. if a vendor won't sell screws to you using this method then i suggest finding a new vendor.
tunalover

tunalover
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