SM Flat Pattern Bug?

[jeff4136]

I'm not quite sure what to make of this and hoped someone might be willing to check in builds later than WF2 M010.

2006-03-06_010211_rect-rnd_transition_vss.prt.zip

Pic shows the face used as driving surf and unbend
fixed ref.

View attachment 1918

I can write the VSS quilt out as IGES,
import into new file, thicken, convert to
SM and flatten. It's a curiosity question,
more than anything.
-TIA

 

[dr_gallup]

It won't unbend in WF2 M120.

 

[jeff4136]

Many thanks, appreciate the effort.

 

[especial]

Dang, it works for me. I used a blend to create the model. I borrowed a box with W2 M090.

 

[jeff4136]

> Dang, it works for me.

The existing thickened VSS or your blend?

 

[especial]

I took your model as is, and in the model tree I put my insert above your vss. Then I created the blend, and sheetmetal.


To make the flat patternIused my "pin ball hammer" and flattened it. lol
Edited by: especial

 

[jeff4136]

Thanks for the confusing and irrelevant reply, then.

-cheers

 

[Isair]

Nop it won't unbend either in WF 2.0 M180.

 

[especial]

Here you go a picof your irrelevant part

View attachment 1928
Edited by: especial

 

[jeff4136]

Thanks, Isair.

 

[Dell_Boy]

VSS is entirely the wrong tool to create this sort of feature.



check out



http://www.ptc.com/cs/cs_24/howto/smd1311/smd1311.htm



where they use a blend with a lot less features to do this. I suspect
you have created a subtle fault with VSS that prevents sheetmetal from
unfolding it, like a wall
that does not terminate normally with respect to the adjacent driving
surface.



It is also possible that when you re-imported the iges and converted to
sheetmetal, that Pro/E fixed these inconsistencies for you allowing it
to be unfolded.





DB



Edited by: Dell_Boy

 

[jeff4136]

Thanks, DB.

I'm aware of how to model a transition that will unfold and most, if not all, the possible reasons for what I'm seeing.

Whether or not to call it "bug" is up to PTC. I was simply curious to see what happened in newer builds.

As for it being "entirely the wrong tool"; as it won't work I'll agree. Other than that; well, what's the point of further conjecture? A cylinder and that VSS quilt analyse to the same 5e-6 Gaussian curvature. Is there something I'm missing in my analysis?

 

[Dell_Boy]

The wrong tool was meant in terms of using an SUV when a car will do the job quicker and use less gas in the process.



Also I don't see why you didn't create this a thin section rather than a thickened surface.



This is not the first time I have seen people use VSSs when they could
have used a far simpler tool for the job and suffered less problems
along the way.



The quilt may not be the problem. It could be the part edge faces.





DB



Edited by: Dell_Boy

 

[jeff4136]

Thanks again. I'm sure you mean well but there is a reason I posted to this group vs. the Modeling group. With the exception of a definitive explanation for the failure I don't see any reason to continue this topic.

 

[brenyw]

Try putting 4 tiny flats onto the large diameter circle, corresponding to the flats at the other end of the extrusion, unbend will then work fine.

 

[jeff4136]

.


Gong!!!!

.

 

[jeff4136]

Guess this can be written off as a 'limitation' [url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=38 695[/url]