Reference Dimension: Diameter In or Out?
Reference Dimension: Diameter In or Out?
(OP)
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
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





RE: Reference Dimension: Diameter In or Out?
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.
RE: Reference Dimension: Diameter In or Out?
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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.
RE: Reference Dimension: Diameter In or Out?
Certified Sr. GD&T Professional
RE: Reference Dimension: Diameter In or Out?
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.
RE: Reference Dimension: Diameter In or Out?
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/getfile.aspx?folder=5...
RE: Reference Dimension: Diameter In or Out?
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
RE: Reference Dimension: Diameter In or Out?
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