dim bound and skeletons 1

[daveykbelgium]

I have created a sketch in a “true” proe skeleton. this sketch is made up of a number of lines and arcs

I added an asymmetric tolerance to one line in the sketch

With true proe skeletons, it seems impossible to use the dim bound command - it simply isn't there!

I then created publish geometry which includes this line only (and of course the asymmetrical tolerance)

In a new “standard” proe part, i used copy geometry to see the publish geometry in the “true” proe skeleton

If i add a feature to my model that references the copy geometry, and use the dim bound command, the part is regenerated but does not show that the original skeleton changed!

Permission to say "grrrrrr" very loudly?

Does anybody have a work-around, or shall i stick to pretend skeletons which are standard proe parts containing only datum curves?

Hurry, hurry, i have a meeting tomorrow to break this good news! just image lamenting about how great top-down methodologies are, only to find you are making such a fool of yourself!

Thanks

Dave

 

[3dlogix]

You have a very interesting topic. Dim bounds are used to evaluate min/max condtions, so they figured "why put that on datum curves?".
Can you replace the datum curve in question with a surface and use a dim bound on that feature?

Good luck with your meeting.

Steve

http://www.sprdesign.com

http://www.3dlogix.com

 

[daveykbelgium]

Cheers for your suggestion 3dlogix.

Sadly dim bound doesn't appear even with a surface!

I like your site by the way - I do the same in Belgium

Meeting delayed

Cheers

Dace

 

[3dlogix]

Thanks Dave, glad to hear at least the meeting was delayed. Gives us a chance to offer more suggestions.

Bonjour et a la prochaine!

Steve

http://www.sprdesign.com

http://www.3dlogix.com

 

[3dlogix]

Why dont you just make a Protrusion in the Skeleton model and put dim tolerances on that feature?

Steve

http://www.sprdesign.com

http://www.3dlogix.com

 

[daveykbelgium]

Hi Steve

By the way I'm English and live in the Flemish (Dutch) speaking half of Belgium. I wonder how good your Dutch is – tee hee!

I use the "true" Pro/E skeleton to define the fundamental geometry of parts. This is fed into sub-module geometry using publish and copy geometry.

During part release, we set our models to mid-band tolerance for CNC programming (sheet-metal is laser cut). Thus I wanted the skeleton to have dim bound functionality.

This bizarrely isn’t an option, so my solution is;

I also use a project layout.

Here I have added parameters for a range of hole diameters, i.e. 'hole_08', with a real-number value of 8.00

I now use relations in my skeleton - the datum curve for a hole can now be set to equal the 'hole_08' parameter.

When I detail my part, I use an assembly. The assembly contains the skeleton, and the part. All fundamental features relate to the appropriate geometry on the skeleton - with a dependency through the assembly. The assembly is very light, so this is not a compromise. As it happens, we also use the assembly for inserts, so in fact everything works out very nicely

Because our holes centres are always symmetrical, the skeleton can be used to define the hole centre, but not it’s diameter. The diameter is controlled using the same parameter from the layout that controlled the datum curve in the skeleton.

Of course a wrong parameter could be used, but as the part is modelled in assembly mode, this should be immediately obvious – a reference dimension could be used for extra security!

In the part, using properties, a tolerance is added to the hole.

Now, when the part is regenerated, it does regenerate to its mid-band tolerance!

Viola! Oooops!

Tot ziens (until next time)

Thanks for your help

Dave

 

[3dlogix]

Dave;

I appologize for my assumptions-all people I have met from Belgium spoke French. But then again I live in Quebec, so the French speaking Belg's would come here more easily!!

As for your set-up, it seems very well thought out and excecuted, great job! You get a star, hoping that others will read and pick up on your design.

Steve

http://www.sprdesign.com

http://www.3dlogix.com