【转帖】call out symbol question

yang686526

call out symbol question
i have a drawing stating a callout for plating finish followed by another number in parentheses after that.  can someone explain this to me.  it's a drawing in mm.
i have never seen one in parentheses like that. not sure what it means.
chris
solidworks/pdmworks 08 3.1
autocad 08; catia v5
what i am thinking is the plating is to 6.3 microns except where it isn't marked on the edge (3.2 is acceptable here).

i would not have ever guessed that. if the plating is not needed or is different elsewhere, it needs to be indicated somehow with a note or another symbol.
chris
solidworks/pdmworks 08 3.1
autocad 08; catia v5
the drawing itself has the symbol with the 6.3 mark a in a few specific places.  otherwise it's blank.  since the plating is nickel (electroplated) i am venturing that the 6.3 thickness is necessary only where it's indicated and the lower value is acceptable elsewhere.  however, i'd like another technical person to confirm my thoughts.
6.3 isn't the treatment thickness is it, isn't it the roughness?
i see this all the time with din (german) drawings.
the 6.3 is showing the default surface finish, and you shouldn't find it anywhere else on the drawing.
the 3.2 is showing that there is a different surface finish specified somewhere on the drawing for a specific area or surface.
as an example, you might see this on a drawing of a round part.  you would have a surface finish of 6.3um on the entire part...except where there is the same symbol from inside the parentheses is shown pointing to the bore.
the text behind everything (broken edges, plated), from what i have seen, looks like the literal translation from german. (no, i can't find the german version right now, mainly because i reeeealy need it)  it means "break all edges, and do it before plating"
just for reference, i have seen up to 4 surface finish symbols on a drawing, one outside and three inside the parentheses.  it's always a lot of fun finding them all
"a designer knows that he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away"  - antoine de saint-exupry
yes it is a din drawing and it was a google translation.  thanks very much.
i dont see where you say which standard the drawing refers to. i do see that you write that it is a din drawing.
if the drawing references asme y14.5m 1994, then dimensions shown in parentheses are "reference dimensions" unless other wise specified.  pg 42 3.3.8, pg 45 fig 3-8, pg 2 1.3.10.
not sure if the iso equivalent differs in this symbology.
designbiz
"quality is in the details"

that was my thought too kenat, but i wanted somebody with more smarters to say it. ;)
-- mecheng2005
i didn't add it originally to my question because i didn't know that it was specific to a iso drawing.  while i work with drawings i don't see a lot of symbols beyond hole callouts, mainly due to the simplicity of the drawings we are dealing with.