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Dimensioning Features that cannot be shown true size

Dimensioning Features that cannot be shown true size

Dimensioning Features that cannot be shown true size

(OP)
It is normal practice when creating a drawing to choose a view that shows particular features true size. However, in SW it is possible to show features that cannot be shown true size in any view. In my case I have a helical cutter blade (x-section swept about a helix). What is the best way to present features on an object that has no flat surfaces?

RE: Dimensioning Features that cannot be shown true size

I'm having trouble picturing what you mean. Can you post an image of what you are trying to view?


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Dimensioning Features that cannot be shown true size

(OP)
CBL,

Just sweep a rectangular section around a 1/8 turn helix. Then think about how you would position it in a drawing so that somebody could get dimensions off of it.

RE: Dimensioning Features that cannot be shown true size

Make a config which has a perpendicular cut across the swept profile. Then create a view onto that surface. That view can then be placed into the drawing & dimensioned.


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Dimensioning Features that cannot be shown true size

(OP)
Referenced to what? It is easy to do perpendicular in SW. But how do you communicate that to the guy who has to measure the part. CMM not allowed. We don't have one. And then there are the holes in the real part. And angle cuts.

RE: Dimensioning Features that cannot be shown true size

Make section views of cross-section areas to be measured.

Chris
Systems Analyst
SolidWorks/PDMWorks 05
AutoCAD 05
ctopher's home site (updated 06-21-05)
FAQ559-1100
FAQ559-716

RE: Dimensioning Features that cannot be shown true size

(OP)
What feature on the helix will the section view be oriented to?

RE: Dimensioning Features that cannot be shown true size

Are you trying to create an inspection drawing or a machining drawing?
Is the helix a standalone feature or a just a feature of a part?
More info is needed to be able to answer your original question. Without seeing the part, how are we to know what you can use as a reference, or what the section could be oriented to? An image would really help.


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Dimensioning Features that cannot be shown true size

(OP)
Is there a way to post an image on this forum? a sldprt?

RE: Dimensioning Features that cannot be shown true size

(OP)
Here is a 3 view and trimetric view.

RE: Dimensioning Features that cannot be shown true size

I think you forgot something. smile


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Dimensioning Features that cannot be shown true size

(OP)
No, I didn't forget anything. Syntax is per FAQ. Problem is my hosting service won't permit a raw image to go out. It has to be referenced by an html document. And html document's aren't welcome here as a reference. Eng-Tips didn't throw an error when the 403 page came up.

RE: Dimensioning Features that cannot be shown true size

CorBlimeyLimey, a patient man you are! yoda yinyang

Flores
SW06 SP2.0

RE: Dimensioning Features that cannot be shown true size

Try www.ImageShack.us for hosting images only. (Registration is required but is free)
Or www.MooLoad.com for hosting images &/or files. (Registration is NOT required & is free.)


Helpful SW websites  FAQ559-520
How to get answers to your SW questions  FAQ559-1091

RE: Dimensioning Features that cannot be shown true size

Quote (kellnerp):

However, in SW it is possible to show features that cannot be shown true size in any view. In my case...x-section swept about a helix.

If a helix is around an axis that is square with the drawing frame of reference, it takes two projections to get the "helix normal" view.  This is similar to what is required to dimension a compund miter end.

My model pile: <http://www.esoxrepublic.com/models/>
file: CompoundAngleToGetHelixSection.zip

I used an axis to reference the section normal.  A plane wouldn't do for referencing drawing entities to the model.

I could be the world's greatest underachiever, if I could just learn to apply myself.
http://www.EsoxRepublic.com-SolidWorks API VB programming help

RE: Dimensioning Features that cannot be shown true size

(OP)
Now that my hosting service has responded we have an image. Lets give Tom a big thanks.

Back to the problem at hand. Most of the responses so far have been specific to the helix and have referred to getting a decent view of the cross section. That of course is the easy part. It wouldn't be so easy if I varied the cross section as I swept it. Now, just suppose there were two bolt holes in the helix shown above. Each one is created normal to the surface. The dimensioning for the bolt hole feature size shouldn't be too hard to do. But the location dimensions, that is another matter. I would like to be nice to the machinist and the QC folk and give dimensions to some datum. Problem is there doesn't seem to be anything handy to use as a datum. The axes and construction geometry I use in SW to create such things are lost the minute I create a drawing and for sure are lost when the part is made.

And just to avoid the obvious, this part would be made using a CNC process or perhaps cast from an FDM wax pattern.

RE: Dimensioning Features that cannot be shown true size

I design these...

And make a drawing like this...

I make a sketch in the drawing to get points I can actually dimension to along the helix. Is this what you'tr looking for?


Windows 2000 Professional / Microsoft Intellimouse Explorer
SolidWorks 2006 SP01.0 / SpaceBall 4000 FLX
Diet Coke with Lime / Dark Chocolate
Lava Lamp

RE: Dimensioning Features that cannot be shown true size

I give up... I just up-loaded those files & 2 minutes later it can't find them... I got work to do.


Windows 2000 Professional / Microsoft Intellimouse Explorer
SolidWorks 2006 SP01.0 / SpaceBall 4000 FLX
Diet Coke with Lime / Dark Chocolate
Lava Lamp

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