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Question on Surface Roughness Callout

Question on Surface Roughness Callout

Question on Surface Roughness Callout

(OP)
Is there a difference between the call-outs in the image?

RE: Question on Surface Roughness Callout

I believe the second one may be wrong.  The actual surface roughness value goes as shown on the left hand symbol.

Take a look at this link.

http://www.misumiusa.com/CategoryImages/Metric_2006_pdf/METRIC1837-1838.pdf

 

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: Question on Surface Roughness Callout

Second one is not wrong perse, it is normaly used for (German) Rz value's, something completely different than Ra values, watch out!

Furthermore it can also mean a certain measuring length in mm, it all depends.

 

RE: Question on Surface Roughness Callout

Both are showing the same thing. The right one is correct as per current ISO standards (BS and DIN included) but both are suspect as they do not denote Ra or Rz. In such a case the lettering is normally put before the number using the symbol shown on the right to read "Ra 1.6"

RE: Question on Surface Roughness Callout

Ninja182

No need of mentioning Ra. Just value is Enough.
But for Rz we need to show Rz along with value.

NX 6.0.2.8 MP4
Teamcenter 2007
WINDOWS XP (64 Bit)
 

RE: Question on Surface Roughness Callout

I work for a firm where most of the components use Ra but some running surfaces require Rz, I think its mainly to keep the drawings looking tidy that our internal standards dictate we lable both.

The other reason im all for it is that it's 2 characters and I'm all for stamping out every trace of ambiguity - have come across far too many people trusted to read drawings who given the chance will misinterpret everything they can get away with.

Will Walters
Sheffield UK
Designer of machine tools - user of modified screws

RE: Question on Surface Roughness Callout

"The other reason im all for it is that it's 2 characters and I'm all for stamping out every trace of ambiguity - have come across far too many people trusted to read drawings who given the chance will misinterpret everything they can get away with."

This is what experience brings, sense! I fully agree.



 

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