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Bari14-Alexandrite
14-Alexandrite
August 29, 2012
Solved

How to fFlatten this quilt

  • August 29, 2012
  • 2 replies
  • 5682 views

Hello all,

Anyone to try and flatten this quilt (feature TO_FLATTEN). Maybe some extra pairs of eyes can see something that I'm not figuring out (or it's impossible to flatten).

File is in Creo 1.0.

Thanks for any help.


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Best answer by BrianMartin

Try tweaking the accuracy Antonio...

If 5.6 works for the radius and anything LESS does not, this is a classic accuracy problem. Whenever you have a feature that stops working when values start getting small, increase your accuracy and try again.

The default Creo accuracy is .0012

First, change this to .0003 and then try a radius of 5.5 or 5.4. If the increased accuracy allows those lesser values to work, you've found your problem. You can increase your accuracy to .0001 without having to do anything special. If you still need to go tighter than this, there are options. Typically unless you have a critical need to go tighter, it's not a good idea to use values less then about .0003. With changes to your config.pro files, it's possible to go down to about .000001 but this adds serious regeneration time.

Let us know if an increased accuracy allows you to use radii smaller than 5.6.

Thanks!

-Brian

2 replies

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BrianMartin13-Aquamarine
13-Aquamarine
August 29, 2012

Hi Antonio...

Use the Flatten Quilt feature from the Model Tab. The menu is shown below.

flat_surf2.png

To use this feature, you need to create a datum point directly ON the surface of your quilt. The feature is easy to use... it's almost self explanatory when the dialog box pops up you'll figure it out.

There was ONE small reason Creo was having difficulty flattening the piece... the small round and flat triangular region in the upper right hand corner as shown below...

flat_surf3.png

I removed the round and triangule surface from the quilt and then the Flatten Quilt feature worked just fine. The resultant surface is shown below...

flat_surf1.png

I just went back and tried the same Flatten Quilt feature WITH the round added back in. It still flattens. As I suspected, the real point of failure is the triangular surface which is ALREADY FLAT. Not sure if this helps or hurts though!

I reflattened the quilt using a point on the round (right at the edge). The result is below...

flat_surf4.png\

Zooming in on that upper right hand corner...

flat_surf5.png

Notice the small red "X". That's the point I used to flatten the quilt. Not sure if any of this is giving you what you need or not.I'm also not sure what to do with the triangular area. Write back if you have more questions... I hope this did SOMETHING to help.

Thanks!

-Brian

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Bari14-AlexandriteAuthor
14-Alexandrite
August 29, 2012

Hi Brian, thanks again for the valuable help, you surely did SOMETHING to help.

In fact I've managed to flatten it but you went a little bit further by adding the radius (which I didn't try). The radius was added by me because without it Creo will warn you that the surfaces are not tangent.

I've also managed to obtain this (image below) using the Manual Parametrization method and specifying the back surface as reference but the result doesn't seem very accurate. With this type of method i'm able to include the triangular surface.

qwe1.jpg

qwer2.jpg

Thanks.

T
TomD.inPDX17-Peridot
17-Peridot
August 29, 2012

This is what I ended up with using Brian's method using automatic no specified placement:

flatten.PNG

Green is original surface and violet is the flat surface.

T
TomD.inPDX17-Peridot
17-Peridot
August 29, 2012

I am no expert at flattening quilts but I couldn't flatten yours either. If someone solves it, I'd like to see the model.

This seems to be a very demanding and fussy command.

B
Bari14-AlexandriteAuthor
14-Alexandrite
August 29, 2012

Thanks for the reply Antonius, this is indeed a quiet powerful command but it has its "tricks".

B
BrianMartin13-Aquamarine
13-Aquamarine
August 29, 2012

I agree...

Flatten Quilt can be finicky... but it's very powerful. I didn't try playing with the Parametrization Surface or Method but both can used to provide alternate results. Usually I use Flatten Quilt in conjunction with Solid Bend to achieve some cool "bent" effects like these. Both objects were bent using the Flatten Quilt/Solid Bend technique...

manifold.png

It's hard to see the curve in this next image... but it's there. You can do some pretty extreme bends using Flatten Quilt as the basis. There was no need for an extreme bend in the case of the object below...

manifold2.png\

Thanks!

-Brian

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