yang686526

surface profile with basic dimensions. reporting gd&t on par
hello,
i have a single plane wire form (shaped like the letter "r")that is loaded with gd&t. there are several basic dimensions and a surface profile for this shape. am i correct to inspect this part using a mylar drawn to theoretical exact size and making sure my parts falls within the surface profile boundries? also, do i report gd&t on part layout, or just say "ok to profile tolerance"?
can you show a pic? i'm not sure you would want to use much gd&t on a wire. maybe i'm not clear.
chris
solidworks/pdmworks 08 2.0
autocad 06/08
it greatly depends exactly how the gd&t tolerances are specified so it is impossible to say for sure without a pic. is there only the profile control or are there other controls? if i were making the drawing i would try to tolerance it so that you can just offset the nominal size by the profile allowance. we usually put the mean, min & max profiles on the mylar. you would report it like any attribute gage, just good or bad.
that is how i would do it...like a go/no-go gauge.
chris
solidworks/pdmworks 08 2.0
autocad 06/08
a picture would help, but yes you seem to have captured the intent. again however without getting clearer definition or seeing the print and how the callouts are applied this is just speculation.
for those of you who requested a drawing i have now attached one here. thanks to all for helping!
one could use a template with outer boundaries shown but it wouldn't be exactly correct since profile is always in a rfs mode, the tolerances would be applied beyond its own size. if one uses a template, i would report "ok to profile tolerance".
one could also measure the location with a cmm but in that case each location would have to be measured independently and reported likewise.
since is wire is a feature of size, it would have been best if the drawing what shown in a positional tolerance at mmc. your template could be reflected in the outer boundary (virtual condition size and location) and a template or checking fixture could easily been made.
dave d.
dmrm (mechanical),
i couldn't open you attachedment. there was none but i'll reply.
this was they way we did it.
-produced mylar (10x full scale)with profile lines shown at nominal, max and min. (placed mylar on shadow graph)to compare actual part against
-get your customer to approve your method
we used this method on non-critical areas of mfg. parts.
---solidworks 2008 sp3.0---