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What's with the weird bend radius on bend w/ custom sketch?

Question asked by Samuel Leith on Jun 18, 2016
Latest reply on Jun 19, 2016 by Samuel Leith

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Hey everyone,

See part attached. Super simple sheet metal part.

What I'm trying to achieve is this: I want to model the result of having a tapered piece of sheet metal with two 90deg bends in it.

Is there a better way to go about this?

SW does not seem to like my approach. As you can see, the radii are very weird looking in the 3D, and the resulting flat pattern has kinks in it. See screenshot.

I'm not usually that fussy about the small details, but the part will be manufactured from the 3D and is intended to be a highly aesthetic part.

Thanks!

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sheet-metal.SLDPRT.zip67.3 KB

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Swapnil Dhake Jun 19, 2016 5:31 AM

Hello Samuel,

Using sketched bend can help you to some extent.

I tried it already and have attached part (dimensions are not exactly per original)

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sheet-metal_modified.rar129.4 KB

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Balogh Gabor @ Swapnil Dhake on Jun 19, 2016 9:37 AM

Hello!

I think same like Swapnil that sketched bend would be the best to choose. I wouldn't use extruded cut to achieve the wanted shape I prefer to make it as sketch for base flange.

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Swapnil Dhake @ Swapnil Dhake on Jun 19, 2016 9:37 AM

One more thing,

If you are going to get it 3D printed, you don't have to use sheet metal features to make it, right ? You can use extrude, cut, fillet.....

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Dennis Bacon Jun 19, 2016 8:18 AM

Samuel,,,, If you change you flange positions to material inside and custom relief type to Tear with the extend option I think you will get what you are looking for. Obviously you need to change the flange length to compensate for the "bend outside" to "material inside"

Edit:.... I noticed that in your first pic you and pointed out the areas in your flat pattern that apparently bother you for some reason. If this is a problem for you (I don't use simplify bends) then I would do an unfold, cut the angle, then fold.

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Samuel Leith Jun 19, 2016 10:48 AM

Thanks for the tips.

Sketched bend lines do yield a cleaner result (ie. flat pattern).

My other computer has SW2016 installed. I might be wrong, but a vaguely remember an improvement to the sheet metal radii somewhere between 2012 and 2016. I'll have to test that.

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5 Replies

Swapnil Dhake Jun 19, 2016 5:31 AM
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Hello Samuel,

Using sketched bend can help you to some extent.
I tried it already and have attached part (dimensions are not exactly per original)
Attachments
- sheet-metal_modified.rar129.4 KB
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- Balogh Gabor @ Swapnil Dhake on Jun 19, 2016 9:37 AM
  Mark Correct
  Correct Answer
  Hello!
  
  I think same like Swapnil that sketched bend would be the best to choose. I wouldn't use extruded cut to achieve the wanted shape I prefer to make it as sketch for base flange.
  Like • Show 0 Likes0
  Actions
- Swapnil Dhake @ Swapnil Dhake on Jun 19, 2016 9:37 AM
  Mark Correct
  Correct Answer
  One more thing,
  If you are going to get it 3D printed, you don't have to use sheet metal features to make it, right ? You can use extrude, cut, fillet.....
  Like • Show 1 Like1
  Actions
Dennis Bacon Jun 19, 2016 8:18 AM
Mark Correct
Correct Answer
Samuel,,,, If you change you flange positions to material inside and custom relief type to Tear with the extend option I think you will get what you are looking for. Obviously you need to change the flange length to compensate for the "bend outside" to "material inside"

Edit:.... I noticed that in your first pic you and pointed out the areas in your flat pattern that apparently bother you for some reason. If this is a problem for you (I don't use simplify bends) then I would do an unfold, cut the angle, then fold.
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Samuel Leith Jun 19, 2016 10:48 AM
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Correct Answer
Thanks for the tips.
Sketched bend lines do yield a cleaner result (ie. flat pattern).
My other computer has SW2016 installed. I might be wrong, but a vaguely remember an improvement to the sheet metal radii somewhere between 2012 and 2016. I'll have to test that.
Like • Show 0 Likes0
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What's with the weird bend radius on bend w/ custom sketch?

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