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mlocascio1-Visitor
1-Visitor
August 20, 2014
Question

Dimensioning Drafts

  • August 20, 2014
  • 52 replies
  • 81185 views
Pete Bokma,



Thank you for the suggestion. I think that what you are referring to would be A) A FAKE dimension on a drawing (if I went that way) or B) additional geometry in the model.



Please keep in mind that this draft is outbound. That may have some bearing on how it displays. Still, I would like to see a better way to display a draft dimension.



Michael P. Locascio



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nuheht1-Visitor
1-Visitor
August 20, 2014
I have had problems so many times with "fake" (aka created) dimensions. Created dimensions should only be used if there is no way if showing the dimension, as in complex surfaces. If the dimensioning scheme needs changed, I always change the model to reflect that and show the new dimensions on the drawing. Only takes a few seconds to do that and the end result is a much more robust drawing/model that you can pick the dim on the drawing to modify the model. To me, it just seems as the way to go, and I have been doing it this way since release 9. 



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BrianTaylor8-Gravel
8-Gravel
August 20, 2014
More salt to add to the wounds.... you can't fake it when you have a
requirement that your models are MODEL BASED DEFINITION. I.E. NO DRAWINGS
all information must be in the model and setup with annotation states.


Brian L. Taylor
Principal Technical Support Engineer
Hardware Engineering Center
Space and Airborne Systems
Raytheon Company
972-344-7697 (office)
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13510 North Central Expressway
Dallas Tx 75243 USA
www.raytheon.com

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ShandRonnie1-Visitor
1-Visitor
August 20, 2014
I totally agree here with Robert.

Here is the definition of a created dimension:
Created dimensions are in no way fake dimensions.
Created dimensions represent 100% the size of model.
Created dimensions are the true value that Pro/E computes from the model been shown in a drawing view.
If the value in the model changes, the created dimension will also change and update in the drawing

Many times it is faster to create the dimension than to show it by find it in the model.
Some companies have designers model all the parts and then a complete different department makes the drawings.

Regards,
Ronnie A. Shand
Staff Mechanical Design Engineer
Lockheed Martin Mission Sensors & Training MST
100 East 17th Street
Riviera Beach, Florida 33404
-
Phone 561-471-4342
M
mlocascio1-VisitorAuthor
1-Visitor
August 20, 2014
Model Based Definition is definitely a way to eliminate the added dimensions on a drawing.




C
cdown1-Visitor
1-Visitor
August 20, 2014
I've always said added dimensions are a big no no!
That is why you buy a parametric modelling system.
I have worked in many companies and added dimensions have caused no end of
costly trouble!! If your model is created correctly then your design intent
is there thus no need for added dimensions.
I might be wrong but why dimension something twice & not know what is on
the drawing is actually what the model is??



M
mlocascio1-VisitorAuthor
1-Visitor
August 20, 2014
Yes, of course it is faster and easier to create dimensions. But it is also extra work if the dimensions were already modeled in.



Fake is fake. When a dimension doesn’t come from the model, it is fake. It’s another AutoCAD drawing. If you want to do AutoCAD, they have a program for that.



Michael P. Locascio


M
mlocascio1-VisitorAuthor
1-Visitor
August 20, 2014
Colin,



AMEN BROTHER!



Created dimensions should only be used as a last option. There are times when the only way to show the design intent of a feature is to create a dimension.


D
davehaigh13-Aquamarine
13-Aquamarine
August 20, 2014
I see this has now devolved into the religious war over shown and created dimension.

Here’s my take on this.

There are many times where the design intent does not match what’s required on a drawing. Redefining the part just so you can get the dimension you want on the drawing can ruin the built in design intent of how it was modeled.

I’ve received parts that have almost no dimensions, because the engineer referenced features of the mating parts in the assembly. In that case, I’m not going to redefine his part just so I can show some dimensions.

In another case, we had a sub-assy that needed to show the range of motion. The skeleton drove the placement of the parts, but we needed to make weldment drawings that didn’t match the assembly structure. If we had tried to make assemblies that matched the drawings we needed the motion component of the design would not have worked. We made simplified reps and family tables to create the various weldment drawings.

There is no hard and fast rule. You do what you need to do to get the stuff out the door.

I use shown dimensions when I can, but I have no problem using created dimensions either. There’s no need to put Galileo on trial again over where the center of the universe is.

David Haigh
Phone: 925-424-3931
Fax: 925-423-7496
Lawrence Livermore National Lab
7000 East Ave, L-362
Livermore, CA 94550

________________________________
J
jmoody-21-Visitor
1-Visitor
August 20, 2014
I do see a distinction between created dimensions in part annotation vs. on the drawing. In the former case the ‘fake’ dimension lives with the part/assy i.e., if the drawing file is blown away the created dimension can still be shown on a new drawing.





John



J
jlippeth1-Visitor
1-Visitor
August 20, 2014
My 2 cents

Working in the Molding / Casting world.

One of the first features is an Extract.

An Extract has no dimensions, zip, notta, none.

You can click all day on that show dims icon and no dims will magically appear, so put down the Kleenex and wipe the tears and CREATE dims.

(Ok back to creating dims, lol)



Jeff Lippeth ▪ Mold Design Engineer

NyproMold, Inc.

▪ P 847.855.2226


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