10 Replies Latest reply on Jun 13, 2018 11:27 AM by Glenn Schroeder

custom weldment profile not constrained

Timothy Taby Jun 13, 2018 10:16 AM

I am trying to make a custom profile of an aluminum extrusion. I made my profile sketch and constrained the entire thing so it can not move at all, but when I add it as a structural member as a weldment parts of it blow apart and will not allow the weldment to be created. Anyone know why this is and how stop it from happening?

on the left is when I am adding the weldment, parts of t he profile move. On the right is the profile how it's supposed to be.

Re: custom weldment profile not constrained

Manish Panchal Jun 13, 2018 10:26 AM (in response to Timothy Taby)

Hi Timothy,

In sketch place point mark for location.

Once you complete your sketch right click on sketch & select Add to Library.

And in last save your sketch as a .sldlfp (Library feature part) in library.
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Re: custom weldment profile not constrained

Glenn Schroeder Jun 13, 2018 10:35 AM (in response to Timothy Taby)

I've never seen anything like that. Without seeing the files I can only guess, but I wonder if it has something to do with the multiple closed profiles in the sketch. Can you post the Part and the .sldlfp file?
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- Re: custom weldment profile not constrained
  
  Timothy Taby Jun 13, 2018 10:50 AM (in response to Glenn Schroeder)
  
  and it doesn't always blow up the same way when I insert the member.
  
  I tried adding it to a new sketch and it went haywire in a different way.
  
  Here is my sketch I made the library feature from, I made it fully constrained after the first time I tried to insert it as a welment and it went bonkers on me.
  
  https://dl.dropboxusercontent.com/s/0jwjy25ow8i8ymo/EX-6.zip?dl=0
  here is a link to download the library feature and the part I was trying to insert it on.
  https://dl.dropboxusercontent.com/s/0jwjy25ow8i8ymo/EX-6.zip?dl=0
  
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  - Re: custom weldment profile not constrained
    
    Glenn Schroeder Jun 13, 2018 11:09 AM (in response to Timothy Taby)
    
    I tried the same thing and got a similar result to yours. I opened the .sldlfp file, edited the sketch, deleted 3/4 of it, Fixed everything, then finished it with two "Mirror Entities" functions, closed the sketch, and saved (see attached). When I tried again it worked fine.
    
    EX-6 Glenn.SLDLFP.zip 76.0 KB
    
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    - Re: custom weldment profile not constrained
      
      Timothy Taby Jun 13, 2018 11:15 AM (in response to Glenn Schroeder)
      
      Thanks Glenn
      
      Is it better to use mirrors to make symmetrical profiles for weldments so that it limits the automatic constraints?
      
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      - Re: custom weldment profile not constrained
        
        Glenn Schroeder Jun 13, 2018 11:27 AM (in response to Timothy Taby)
        
        Timothy Taby wrote:
        
        Thanks Glenn
        
        Is it better to use mirrors to make symmetrical profiles for weldments so that it limits the automatic constraints?
        
        I don't really know. I'm not familiar with profile sketches with this much complexity. I just thought I'd try it, and it worked. Sometimes I think half the stuff I've learned with SW was a result of something like "Hmm, I wonder if xxx will work?"
        
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  - Re: custom weldment profile not constrained
    
    Glenn Schroeder Jun 13, 2018 11:10 AM (in response to Timothy Taby)
    
    Also, next time please attach the files directly. See How can I attach a file to a forum post? for instructions.
    
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Re: custom weldment profile not constrained

Tom Gagnon Jun 13, 2018 11:15 AM (in response to Timothy Taby)

(Although my support distractions means Glenn has already solved this..)
See the ( - ) in the tree by the sketch. This means it is not fully defined.
Also, is there some purpose to the undefined construction lines in each corner edge? Edit: Glenn, is this the junk you deleted?
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- Re: custom weldment profile not constrained
  
  Timothy Taby Jun 13, 2018 11:21 AM (in response to Tom Gagnon)
  
  The aluminum extrusions are actually sloped slightly to get more tightening on the outside surfaces, hence the construction lines, but when using the profiles in an assembly it's much easier if the surfaces are flat to mate other things to them. This is my first time trying to use the profile as a weldment though, I figured I would try it.
  
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- Re: custom weldment profile not constrained
  
  Glenn Schroeder Jun 13, 2018 11:25 AM (in response to Tom Gagnon)
  
  Tom Gagnon wrote:
  
  (Although my support distractions means Glenn has already solved this..)
  See the ( - ) in the tree by the sketch. This means it is not fully defined.
  Also, is there some purpose to the undefined construction lines in each corner edge? Edit: Glenn, is this the junk you deleted?
  
  I deleted everything outside the red lines below, added the construction lines and deleted all dimensions (deleting the dimensions probably wasn't necessary, but I was going to Fix everything anyway), Fixed everything, then mirrored about the construction lines.
  
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