ISO surface roughness symbol missing roughness?

[tomae]

I have a metric drawing that I need to add surface roughness designations for.    I changed my parameters for the drawing to enable metric units.  When I select the Surface Texture tool and place it there is no field to add the basic (Average) Roughness Value to.  When I am inches mode in a drawing the field exists and everything works according to my understanding of the callout.   According to what I can find on the web the ISO use look of the symbol appears identical so I am not sure why it changes. 

Is this a bug?  Or is my understanding of Surface Roughness in an ISO drawing flawed?  See attached screen shots...

-Tom

[HughesTooling]

This Google search seems to show the ISO standard in Fusion looks right. I guess when you're talking about Inch an MM mode you're talking about the ASME and ISO standards, ASME set to mm doesn't look the same as ISO set to mm for example.

Mark

[tomae]

The first link in your search is EngineersEdge which I often use.  It shows this (inserted screenshot below) which is not what Fusion is giving me (I can't get the "a" field:  Roughness Value in Micrometers).   In fact the first 3 links you sent all show "a" in the crook of the checkmark.  What am I missing?

https://www.engineersedge.com/manufacturing/_iso_surface_roughness_symbols_terminology_13090.htm

[HughesTooling]

Yes looking a bit more I found that one as well but there are others without the roughness value where you show it. I guess there are standards within standards here. @TimeraAutodesk  Can you comment?

Mark

[tomae]

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@HughesTooling wrote:

Yes looking a bit more I found that one as well but there are others without the roughness value where you show it. I guess there are standards within standards here. @TimeraAutodesk  Can you comment?

Mark

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Mark, can you send a link for a valid one that doesn't include the average roughness value in the crook of the checkmark?  I can't seem to find any other than old non-standards....   Average Surface Roughness is a common value used in industry in my (admittedly limited) experience.  I will hand edit  the PDFs before sending them out to put it where my customer is expecting, but I find it odd that I get different behavior when I am using inches vs mm in Fusion. 

PS:  On further reading I am thinking this is the result of someone mis-reading of a specification.  The average roughness value "a" is not in the crook of the symbol IFF you specify more specific parameters.

[HughesTooling · Accepted solution]

From the search I linked above I clicked images as it's easier with pictures. This one for example. Could you use an ASME template set to mm as a workaround?

Mark

[tomae]

Ok, so ISO 1302-2002 seems to be the current specification.  If so, then the way my customer wants it is an old and deprecated method.  So it appears that [perhaps] Fusion is doing it right for ISO/mm documents.   

The current ASME standard seems to be ASME B46.1-2009.  I can't find one of those (easily) so I will assume Fusion is doing the right thing there (putting Ra in the crook of the check mark).

So, your suggestion of using an ASME format drawing with mm units is what I will do.

Here is a random link to the ISO document that may or may not be a "real" version of it (didn't feel like paying for the ISO spec):

http://triblab.teipir.gr/files/Machinery/ISO_1302_2002_Indication_of_surface_texture_in_technical_pr...

Thanks Mark!

-Tom