General Dimensioning Question
General Dimensioning Question
(OP)
You have a box, with three identical tabs welded to the top, extending up. These tabs are aligned in profile in the side view. When dimensioning them, do you dimension the profile using single dimensions, or do you add "3X" to the dimensions?
I had been taught that if it was obvious from the other views that there were aligned, you do not add "3X" as you were dimensioning the profile, not the individul tabs. I can't locate where or if this is addressed in ASME Y14.5.
TIA!
I had been taught that if it was obvious from the other views that there were aligned, you do not add "3X" as you were dimensioning the profile, not the individul tabs. I can't locate where or if this is addressed in ASME Y14.5.
TIA!
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV





RE: General Dimensioning Question
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: General Dimensioning Question
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: General Dimensioning Question
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: General Dimensioning Question
One way around this would be to dimension and use extension lines in the other views that show the tabs, but I am checking a rather busy drawing and didn't want to make it busier.
See attached.
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: General Dimensioning Question
First, it’s 4X, not 3X.
Second, if it was not 4 tabs, but 4 holes aligned in the side view, would you be satisfied with Y14.5 Fig.7-44?
RE: General Dimensioning Question
I can interpret your drawing as shown, but 4X makes everything absolutely clear.
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JHG
RE: General Dimensioning Question
Sorry about the "4X" vs "3X"; this was just a quick pic to describe the situation. That figure (and others in that section) does make it a bit clearer for me.
JHG,
I have to agree... the drawing should not contain any assumptions.
Thanks!
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: General Dimensioning Question
I used to work on 2 CAD systems, one would make array of 4 features, another 1 feature and 3 “copies”.
It was constant “what? How many?”
Good thing we are on the same page. Using multiplier makes it clear and doesn’t take lot of drawing space.
RE: General Dimensioning Question
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: General Dimensioning Question
In SolidWorks, when I am dimensioning hole patterns on my designs, I dimension to the furthest hole away. The dimension line crosses the other centre marks and holes. If, for some reason, I cannot do this, I dimension to the nearest hole and I apply the quantity of holes that line up.
Recently, I was making fabrication drawings of someone's rather sloppy models, so I used SolidWorks' linear centre marks, rather than their single ones. When this features draws the connecting lines, I assume that stuff lines up.
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JHG
RE: General Dimensioning Question
I was taught that clarity overrides standards. Some drawings are so busy its hard to distinguish feature positions that are very close and sometimes a note (eg: "TO .350" TALL TABS, 3 PLACES") saves creating sheet 2 for only one more detail view you couldn't fit on a one page drawing...
lightweight, cheap, strong... pick 2