Can FCF be attached to the extension line of a cylindrical feature of size?

[Diametrix]

According to the standard this is a legal method of attaching FCF: 3.5 (d) "attaching a side, corner, or an end of the frame to an extension of the dimension line pertaining to a feature
of size" However, it just looks really weird to me.

 

[3DDave]

Which version of which standard?

For a long time it was allowed. Later versions require the leader decoration to visually separate the requirement from the related surface.

Lowell W. Foster used the directly attached FCF in his early instructional material.

 

[ewh]

It may look weird if not accustomed to it, but the plunger was just as weird when it was introduced.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[Burunduk]

"attaching a side, corner, or an end of the frame to an extension of the dimension line pertaining to a feature of size" is not what you showed in your image.

 

[Diametrix]

extension of the dimension line

So if "extension of the dimension line" is not referring to a dimension extension line but rather to a "continuation" of the dimension line then such attachment of the FCF is not per standard. BTW I was looking at 2009 standard.

 

[axym]

Hi All,

I'm not a drafting expert, so I'm not sure if I've got the terminology correct here. Can someone confirm whether or not the following statements are correct:

1. The horizontal line with the double-ended arrow is a dimension line.

2. The vertical lines are extension lines.

If these are correct, then the line that the FCF is attached to is not an extension of the dimension line pertaining to a feature of size.

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[Belanger]

Evan, those terms are correct. So an "extension line" is not synonymous with an "extension of a dimension line."

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[ctopher]

I would attach it to the dia dimension, not relate it to a ref dim. Just to be more clear. That's just me.

Chris, CSWP
SolidWorks
ctophers home

 

[Wuzhee]

Not related but Ø0.0039 seems overly specific.

 

[Burunduk]

So if "extension of the dimension line" is not referring to a dimension extension line but rather to a "continuation" of the dimension line then such attachment of the FCF is not per standard.

That is correct.
However if it was a width rather than diameter, your callout would mean that the perpendicularity tolerance is applied only to the left side planar surface (and not to the feature of size).