Call out symbol question 1

[Waidesworld]

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.

 

[ctopher]

I have never seen one in parentheses like that. Not sure what it means.

Chris
SolidWorks/PDMWorks 08 3.1
AutoCAD 08; CATIA V5
ctopher's home (updated Aug 5, 2008)
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[Waidesworld]

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).

 

[ctopher]

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
ctopher's home (updated Aug 5, 2008)
ctopher's blog
SolidWorks Legion

 

[Waidesworld]

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.

 

[KENAT]

6.3 isn't the treatment thickness is it, isn't it the roughness?

http://mdmetric.com/tech/surfruff.htm

I'm wondering if it's meant to mean, machined surface roughness of 6.3um, 3.2um after plating.

However, that's complete guesswork, it doesn't comply with any standard I'm familiar with. I'd try and go back to whoever provided the drawing if possible.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

 

[Gstoner]

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

 

[Waidesworld]

Yes it is a DIN drawing and it was a Google translation. Thanks very much.

 

[DesignBiz]

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"

 

[MechEng2005]

That was my thought too Kenat, but I wanted somebody with more smarters to say it.

-- MechEng2005

 

[Waidesworld]

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.

 

[juergenwt]

The symbol as shown (closed triangle) means that the surface condition has to be achieved where ever a material removing operation is required. This means 6.3 or 3.2 micron in the area marked with this symbol. Material removing is obligatory!
If an area is marked with a triangle without a top line - the surface condition required can be achieved by any means.
DIN/ISO 1302.
Manufacturing methods of surface roughness - attainable arithmetical mean value as per Ra as per DIN 4766-1.
6.3 - from cutting to turning, drilling, reaming, milling.
3.2 - all of the above, only better quality.
If you run into this more often you could go to the "Beuth Verlag" English web site and order DIN 4766.

http://www.beuth.de/

Clk on the English version: top right

 

[juergenwt]

A word of caution.
For all the people using computer translating services like google, babelfish etc. for technical translations - be very careful. Usually they are completely worthless and can lead
to some very costly errors. Best to have someone familiar with the subject in both languages take a look at it.
Not your grandma from Europe. These translating services should only be used as a helper for gen. conversation.
Never for a translation of a technical drawing or other technical info.

 

[PeterStock]

At one point I worked for a company designing a machine to be sent to Spain. We were to leave 3 times the room below each note for a Spanish translation. At one time the company had someone from Argentina do the translation. That did not work, 200-300 years of cultural diversion made the language very different between the two companies. Like it is said about England and the USA two countries separated by a common language.

Peter Stockhausen
Senior Design Analyst (Checker)
Infotech Aerospace Services