Clarify correct usage of the Dimension Origin symbol
Clarify correct usage of the Dimension Origin symbol
(OP)
I have a situation where I am being asking to add a dimension origin symbol to a dimension specifying the height of a dowel pin protruding from a surface, and that surface is a datum.
I don't think this is right, as dimensioning from a datum should set that surface as the origin for that dimension, however I can not find any direct statement in 14.5 that says this.
Can someone either correct me if I'm wrong or provide some type of evidence (that I can use) clarifying that the origin symbol is not required in this situation.
As always thanks for the expertise!
I don't think this is right, as dimensioning from a datum should set that surface as the origin for that dimension, however I can not find any direct statement in 14.5 that says this.
Can someone either correct me if I'm wrong or provide some type of evidence (that I can use) clarifying that the origin symbol is not required in this situation.
As always thanks for the expertise!





RE: Clarify correct usage of the Dimension Origin symbol
CODE --> Y14.5-2009
That last line seems to be the one worth examining.
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NX8.0, Solidworks 2014, AutoCAD LT, Autocad Plant 3D 2013, Enovia DMUv5
RE: Clarify correct usage of the Dimension Origin symbol
It sounds like it's not wrong though, even if it is clearly tied to the datum? If that's the case I'll likely use it for clarity (and to keep the peace).
RE: Clarify correct usage of the Dimension Origin symbol
http://www.draftingzone.com/shoppingzone/6-1.pdf section 2.5 for what it's worth.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Clarify correct usage of the Dimension Origin symbol
RE: Clarify correct usage of the Dimension Origin symbol
As dimension on your dowel is not basic and the end of it is not controlled by FCF, there is nothing wrong about specifying origin of measurement if necessary.
RE: Clarify correct usage of the Dimension Origin symbol
The dimension origin symbol is necessary.
The fact that one of the surfaces is labeled as a datum feature does not make that surface the origin for directly toleranced dimensions. I don't think you'll find anything in the standard that states otherwise.
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: Clarify correct usage of the Dimension Origin symbol
RE: Clarify correct usage of the Dimension Origin symbol
RE: Clarify correct usage of the Dimension Origin symbol
Use of dimension origin symbol, as it is shown in fig. 2-5 (2009), eliminates the confusion (assuming that the side defined as the dimension origin is additionally controlled for its form). It is now clear how the part must be mounted for inspection, what the direction of measurement is, and how the tolerance zone for the opposite side looks like.
http://files.engineering.com/getfile.aspx?folder=7...