20 Replies Latest reply on May 19, 2008 5:26 AM by Andrew Chase

Square 2 round - bend lines

Andrew Chase May 14, 2008 2:09 PM

I am having trouble displaying the bendlines on the flattend pattern of my square to round development. When the lofted bend is flattend it shows no fold lines at all and was wondering if anyone could tell me how to obtain them?

I have found instances where people have turned the edges into polygons and the round part into a polygon and the do a loft between but solidworks wont let me do this in sheetmetal as it says it needs the sharp edges to be filleted, that would defeat the point of creating the polygon.

Find attached an example of my sqr 2 round.

I hope you can help.

12.jpg 43.5 KB

Square 2 round - bend lines

Troy Peterson May 14, 2008 2:11 PM (in response to Andrew Chase)

Under the "View" pull down do you have sketches selected?
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  Andrew Chase May 14, 2008 2:13 PM (in response to Troy Peterson)
  
  Yes it is selected.
  
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    1-6F218O May 14, 2008 2:36 PM (in response to Andrew Chase)
    
    Did you do this in a lofted bend. If so do both scketches have the same number of lines and arcs in them. You need to have the same number of objects in each scetch to have lofted bend work right.
    
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      Andrew Chase May 14, 2008 5:04 PM (in response to 1-6F218O)
      
      I see how this could work, but that would mean splitting the round section into 4 sections and i don't think the development would work out correctly.
      I still don't know how to create a lofted bend using a polygon as i think that would be the best solution.
      Create a square with the corners as quarter polygons with 6 sides then create the circle as a polygon with 24 sides? would create the fold lines i would need!
      
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        1-6F218O May 14, 2008 5:34 PM (in response to Andrew Chase)
        
        Here is an example of how we do ours. We ussualy do them in two halfs but you should be able to get the idea.
        
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        Andrew Chase May 14, 2008 5:44 PM (in response to 1-6F218O)
        
        Many thanks i'll check it out when i get back to work.
        
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        Troy Peterson May 14, 2008 5:47 PM (in response to Andrew Chase)
        
        OK, I created a sq2rnd part and got the same result you did, no bend lines. Here is the reason you are not seeing bend lines. For SW to create bend lines you must have an equal number of lines and curves in both sketches. Meaning you cannot create a true square to round part and show bend lines.
        
        lofted bend2.JPG 239.2 KB
        
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        Andrew Chase May 14, 2008 5:56 PM (in response to Troy Peterson)
        
        Cheers, i have just checked that out. Trouble is it never gives me the bend line control when i do the loft though.
        
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        Troy Peterson May 14, 2008 6:02 PM (in response to Andrew Chase)
        
        You only get to set the number of bend lines when you are creating the bend loft. So to change the numbers you need to delete the current bend loft and create another.
        
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        Andrew Chase May 15, 2008 6:00 AM (in response to Troy Peterson)
        
        Many thanks for all of your help.
        I shall draw a square to round some time today and post it on here.
        
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        Andrew Chase May 15, 2008 9:25 AM (in response to Andrew Chase)
        
        I have drawn a new profile using the methods explained in this thread.
        A square 400mm square with 5mm rads in each corner and a 300mm round split into and equal number of parts as the square, tried lofting it as 1.5mm thk and it says it can't and i should try and smaller thickness. Why is this the case? I can't use a thinner material and i don't want larger rads in the corners as the development will not fit into the flange i am using.
        
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        1-6F218O May 15, 2008 12:02 PM (in response to Andrew Chase)
        
        Andy
        
        I beleive the only way to do this is to increase the bend radius. You might be able to get it to work by decreaseing the amount of bend lines. How many bend lines are you useing.
        
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        Andrew Chase May 15, 2008 12:11 PM (in response to 1-6F218O)
        
        i was trying to obtain 6 per side so 24 total which i didn't think was unreasonable.
        
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        1-6F218O May 15, 2008 1:03 PM (in response to Andrew Chase)
        
        If you typed in 24 under the number of bend lines I think it gives you 24 bends for each bend area so in a SQ to RD \that would be 24 each quarter. So 96 total bends.
        
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        Andrew Chase May 15, 2008 1:10 PM (in response to 1-6F218O)
        
        When i typed in six last time it gave me six in total not six per bend area.
        
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        1-6F218O May 15, 2008 3:22 PM (in response to Andrew Chase)
        
        Thats weird because it does the oppisit with me. What solidworks version are you running.
        
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Square 2 round - bend lines

Kenneth Barrentine May 15, 2008 5:04 PM (in response to Andrew Chase)
Here is an old skool example.

Transition_Duct.zip 366.0 KB
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  Andrew Chase May 16, 2008 5:25 AM (in response to Kenneth Barrentine)
  
  Solidworks 2008 SP3.1
  
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    Kenneth Barrentine May 16, 2008 1:11 PM (in response to Andrew Chase)
    
    not sure what your response means.
    
    you posted a question in "surfacing" category, hence my reply demonstrating a surfacing/sheetmetal method.
    
    fyi, lofted sheetmetal bends do not give accurate flat patterns.
    
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      Andrew Chase May 19, 2008 5:26 AM (in response to Kenneth Barrentine)
      
      I had wondered why they weren't as accurate as i thought they would be. So what is the best method of developing square to rounds then?
      
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