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Bend angles obtained from square 2 round flatpattern incorrect.

Question asked by Johan Kellerman on Nov 22, 2011
Latest reply on Mar 20, 2013 by Don Sundberg

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Hi Guys,

I recently came across a problem regarding the angles solidworks gives me when I develop a Square to Round sheet metal part.

I remember back in the day Solidworks did not give any bend angles for the bend lines and therefore I used an old program for that purpose. Because it was a freeware version it could not convert the profile to DXF or incorporate the material thickness, but it gave me the bend angles I required.

Now about 2 weeks ago we did a project for a client and the part was horribly incorrect (I stopped using the old program because of the information SW gave me). After the investigation was done it came to light that SW gave the incorrect angles.

Therefore my question to you guys is have you ever came across something like this and is there a fix for this?

Thanks

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Bernie Daraz Nov 23, 2011 9:06 AM

Johan,

I noticed on your old program the bend groups all start from the one tangent point at the edge ofthe blank. In the SW drawing they are to a off-part tangent point. I would assume that that would allow for a difference between the two outputs. Have you tried bending either or both to test each of them? I would if I ran into this.

Bernie

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Johan Kellerman @ Bernie Daraz on Nov 23, 2011 9:48 AM

Hi Bernie,

Thanks for the reply. I thought so too in the beginning, but I almost can't believe that the difference in the angles would be so great.

I only assumed it might be SW because the press-brake operator used the angles I supplied him. Therefore after seeing that the older program gave me angles that were ±5 degrees bigger than those of SW, I thought maybe either I did something wrong or there is something about the SW angle development that went astray.

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Pankaj Bir @ Johan Kellerman on Nov 24, 2011 11:46 AM

Dear Johan,

The bends calculated by Solidworks are correct in a sense.

The values are off by 180 degrees. That's what you need to tell your guys in the shop.

180 degree - the angle on the drawing. That will be the angle to bend.

Its the bend angle being reported is unfortunately not configurable . I"ve been on Solidworks

button to get it done.

Maybe they will change it . Inventor has it.

This is true of any angle that is not 90degrees. ( 180-90 = 90)

Pankaj Bir

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Johan Kellerman @ Pankaj Bir on Dec 7, 2011 3:32 AM

Good day Pankaj,

Sorry for my late reply, but it has been really busy these last couple of weeks.

A day after I posted this question a representative of Solidworks in South Africa contacted me (Thank you so much Edyss and Andries from MECAD for the quick response) and helped me with this dilemma by contacting SW technical support directly.

According to them this is a known issue and they will be fixing it shortly (hopefully in SW 2013).

Thanks for your help guys. Really appreciate it.

Johan

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Don Sundberg @ Johan Kellerman on Mar 20, 2013 5:31 PM

Does anyone know if this is fixed in 2013?

Thanks,

Don

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5 Replies

Bernie Daraz Nov 23, 2011 9:06 AM
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Johan,

I noticed on your old program the bend groups all start from the one tangent point at the edge ofthe blank. In the SW drawing they are to a off-part tangent point. I would assume that that would allow for a difference between the two outputs. Have you tried bending either or both to test each of them? I would if I ran into this.

Bernie
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- Johan Kellerman @ Bernie Daraz on Nov 23, 2011 9:48 AM
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  Hi Bernie,
  
  Thanks for the reply. I thought so too in the beginning, but I almost can't believe that the difference in the angles would be so great.
  
  I only assumed it might be SW because the press-brake operator used the angles I supplied him. Therefore after seeing that the older program gave me angles that were ±5 degrees bigger than those of SW, I thought maybe either I did something wrong or there is something about the SW angle development that went astray.
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  - Pankaj Bir @ Johan Kellerman on Nov 24, 2011 11:46 AM
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    Dear Johan,
    
    The bends calculated by Solidworks are correct in a sense.
    
    The values are off by 180 degrees. That's what you need to tell your guys in the shop.
    
    180 degree - the angle on the drawing. That will be the angle to bend.
    
    Its the bend angle being reported is unfortunately not configurable . I"ve been on Solidworks
    
    button to get it done.
    
    Maybe they will change it . Inventor has it.
    
    This is true of any angle that is not 90degrees. ( 180-90 = 90)
    
    Pankaj Bir
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    - Johan Kellerman @ Pankaj Bir on Dec 7, 2011 3:32 AM
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      Good day Pankaj,
      
      Sorry for my late reply, but it has been really busy these last couple of weeks.
      
      A day after I posted this question a representative of Solidworks in South Africa contacted me (Thank you so much Edyss and Andries from MECAD for the quick response) and helped me with this dilemma by contacting SW technical support directly.
      
      According to them this is a known issue and they will be fixing it shortly (hopefully in SW 2013).
      
      Thanks for your help guys. Really appreciate it.
      
      Johan
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      - Don Sundberg @ Johan Kellerman on Mar 20, 2013 5:31 PM
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        Does anyone know if this is fixed in 2013?
        
        Thanks,
        
        Don
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Bend angles obtained from square 2 round flatpattern incorrect.

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