Reference Dimension: Diameter In or Out? 1

[JonSelby]

Although not GD&T I hope this is relevant ...

If you have a reference dimension which is a diameter, would you put the diameter symbol inside or outside of the reference brackets?
For example Ø(1,23mm) or (Ø1,23mm).

If it doesn't show up on other PC's the "Ø" symbol is supposed to be a diameter symbol!! ;-)
I'm working with BS8888, but ASME responses welcomed!

Thank you all!!
Jon

Jon S

Medical Design Engineer
Wotton-Under-Edge, UK
NX 10.0.2 / Teamcenter 10

 

[AndrewTT]

The below is based upon ASME Y14.5-2009.

While I could not find a figure that showed a reference dia. dimension I would say that the dia. symbol should be inside the parenthesis for the below listed reasons.

per figures in 2009
1) The degree symbol is included inside the parenthesis for reference angle dimensions.
2) The dia. symbol is included inside the box of a basic dimension.
3) The radius symbol is included inside the box of a basic dimension.
4) The degree symbol is included inside the box of a basic dimension.

I would say that the dia. symbol, radius symbol, degree symbol are part of the dimension and should therefore be in the parenthesis.

 

[dgallup]

Inside. I used to work for a British company and they always put it inside.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[mkcski]

Our company policy is "inside". We do the same for BASIC dimensions - all related symbols - even "X" (times)- inside the box.

Certified Sr. GD&T Professional

 

[JNieman]

I never understood why some software defaults to placing it outside the parenthesis when toggling 'reference' dimension states. I especially don't understand it when they -do- correctly place it inside basic dimensions. It seems like they may have very deliberately gone to placing it outside parenthesis.

PERSONALLY (I have no other grounds) I find it irksome and illogical to separate the units or geometric symbol from the value using parenthesis. It seems like both the units and the geometric symbol (whether counterbore, diameter, degrees whatever) should be tied to that value. It's just a reference dimension, though, so it's one of the last things worth really worrying about - however it's long been a minor irk I've had.

 

[pmarc]

For indication of reference dimensions per ASME Y14.5-2009 see fig. 2-19 (page 35).

For indication of dimensions and tolerances BS8888 refers to BS ISO 129-1. In this document, as far as I see, there is no example of reference (auxiliary) diameter dimension specification, but there is one showing reference radius dimensions. R is put inside the parenthesis (see attachment). I think this good enough to say that in case of diameters it is no different.

http://files.engineering.com/getfil...4e20-b639-20e71251ee78&file=reference_dim.JPG

 

[JonSelby]

Thanks for the comments.
Sounds like there isn't necessarily a "rule" but all the comments reinforce my preference for the Ø symbol to be inside the brackets.
JNieman - You've hit the nail on the head ... this came about because I have found it irksome that NX defaults the "reference" function to only segregating the value.
Still, in the grand scheme of things a few clicks won't slow the project down (especially when those project 'goal posts' are moving so rapidly!!!).
Cheers all,
Jon


Jon S

Medical Design Engineer
Wotton-Under-Edge, UK
NX 10.0.2 / Teamcenter 10

 

[looslib]

Post your comment in the NX forum. One of the areas Siemens likes to be current with is conforming to standards. Since ASME Y14.5-2009 shows the diameter symbol inside the reference symbol, that should be the default setting for the software. I know in the past when I was on UG2 V3-18, I opened many GTAC calls for these little inconsistencies.


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