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Need help with surface

Question asked by Jens Leander on Feb 26, 2013
Latest reply on Mar 5, 2013 by Charles Culp

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Hey Guys

I am an machine engeneering stud from denmark, I am trying to learn something more about surfacing in solidworks. But now I am facing a problem with a "hobby" projekt i am doing, just for fun.

I really hope someone can help me on this. Not just finishing my model, but also teaching me something.

I have modelled this, it is a seet for a chair. But i am pretty much struggeling with adding something underneath it for mounting a chair leg.

I can easily add something which look awful, but I need to blend it perfectly and tangent into the curves of the chair. I thought about something as simple as a hole, but i need to extrude something to do that hole in.

I have attached my solidworks file.

Let me know if i am not clear enough

/ Jens

Sorry for bad english.

Charles Culp Feb 26, 2013 9:43 AM

Correct Answer

Jens,

I have a newer version of SolidWorks than you, so you might not be able to open this file. I have attached it anyway. Finish the sketch in Sketch 7 by mirroring it to create a complete enclosed sketch. Then extrude up, with an End Condition of "Up to Body". Then select the chair as the body to terminate the extrude.

Now you can use the Fillet command to create a fillet around the base. There is an additional option for Curvature Continuous in the fillet, and I would prefer to keep this on. Unfortunately, the shape of the seat bottom does not allow for a large fillet with this option turned on. Consider deleting these faces, and replacing with a boundary surface, with end conditions of curvature continuous.

See the reply in context

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Stol.SLDPRT.zip803.3 KB

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Louis Liu Feb 26, 2013 2:27 AM

hello,it's my pleasure to talk about this problem with you,do you want to add some leg undereath the seat?or something you want to

do,i just done't understand completely.

i am an chinese engineer,my english is not so good,hope you understand!but i believe that we can resolve this problem,isn't it?

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Jens Leander @ Louis Liu on Feb 26, 2013 2:52 AM

Hey Louis thank you for your help :) Yes I want to add a leg, but first of all I want to add something underneath my chair seat part to add the leg into.

You know, some kind of hole for a round chair leg.

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Louis Liu @ Jens Leander on Mar 4, 2013 10:47 PM

Jens and Charles,

i really admire the way which Charles Culp has done in file Chair_v2.sldprt.as James said,the seat has to be cut a little bit extra material

which is sticking through on the seat of chair.my opinion is that Chair_v2.sldprt has no problem,but the feature for the boundray extrude is no necessary to be done by solid feature.i would like to do the boundray extrude with surfaces(if i were),and knit them to a whole solide part .in this way,you might not worry about if there are some extra material out there.anyway,i don't really think it is suit for you.

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Jens Leander @ Louis Liu on Feb 26, 2013 4:16 AM

Hello again i have drawn something in paint to illustrate what i am looking for:

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Charles Culp @ Jens Leander on Feb 26, 2013 9:43 AM

Jens,

Attachments

Stol_cc.SLDPRT.zip895.3 KB

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Jens Leander @ Charles Culp on Feb 27, 2013 2:56 AM

Thank you so much for that Charles Culp. It was a very nice and SIMPLE way to solve this. I will mark your post as correct.

But.. I am still looking for some other ways of doing this, maybe something a bit more advanced with some surfaces or something which I can learn from

Thank you again Charles

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Charles Culp @ Jens Leander on Feb 27, 2013 9:41 AM

Sure. Instead of extending the extrude "up to body", do it a fixed distance, about 90 mm from the seat bottom (I used 200mm).

Then, create a sketch on the Top Plane that is the shape you want to be your split line on the seat bottom. Then use split line to create this on the seat bottom (see image below).

Now you can use Boundary Boss/Base to create a nice, smooth, and fully curvature continous transition between the two.

Except this gives an error!

So now we must use surfacing tools. Delete Face to each section.

Then use Surface>Boundary Surface

And finally Surface>Knit to create it back to a solid.

I have also uploaded this file again.

Attachments

Stol_cc.SLDPRT.zip1.8 MB

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Jens Leander @ Charles Culp on Feb 28, 2013 4:36 AM

Thansk again Charles.

Your last post really gave me something I was playing around with the first thing you did (boundary boss/bass). I changed some of the sketches and then i had this:

But when taking a closer look at the other side i explored this:

Marked with blue:

How would you get rid of that thing?:)

I have attached the SW file

And last thing; in your last post you figured it all out with surfaces. But how do you "fill" up so it will not just be a shell anymore but a solid?

I really appreciate your help thank you!

Attachments

Chair_v2.SLDPRT.zip1,009.9 KB

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James Moynagh @ Jens Leander on Mar 1, 2013 6:51 AM

Jens,

If you look at Charles model he has delete face action after the extrusion for the stand part, that is how he got it back to a surface, you missed out that part, so the should get rid of that extra material which is sticking through on the seat of chair.

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Charles Culp @ Jens Leander on Mar 5, 2013 9:21 AM

Yes, sorry, I never responded. The area above the seat is caused because you used solid boundary, instead of surface boundary. I suggest using surface boundary, then you won't have this problem.

The way to convert surfaces to solid is to use the Surfacing>Knit tool. Then check the "make solid" checkbox when you knit all the surfaces together, if they enclose a solid. This is the last image in my above post.

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Louis Liu Mar 4, 2013 10:49 PM

Jens and Charles,

i really admire the way which Charles Culp has done in file Chair_v2.sldprt.as James said,the seat has to be cut a little bit extra material

Actions

11 Replies

Louis Liu Feb 26, 2013 2:27 AM
Mark Correct
Correct Answer
hello,it's my pleasure to talk about this problem with you,do you want to add some leg undereath the seat?or something you want to
do,i just done't understand completely.
i am an chinese engineer,my english is not so good,hope you understand!but i believe that we can resolve this problem,isn't it?
Like • Show 0 Likes0
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- Jens Leander @ Louis Liu on Feb 26, 2013 2:52 AM
  Mark Correct
  Correct Answer
  Hey Louis thank you for your help :) Yes I want to add a leg, but first of all I want to add something underneath my chair seat part to add the leg into.
  
  You know, some kind of hole for a round chair leg.
  Like • Show 0 Likes0
  Actions
  - Louis Liu @ Jens Leander on Mar 4, 2013 10:47 PM
    Mark Correct
    Correct Answer
    Jens and Charles,
    
    i really admire the way which Charles Culp has done in file Chair_v2.sldprt.as James said,the seat has to be cut a little bit extra material
    which is sticking through on the seat of chair.my opinion is that Chair_v2.sldprt has no problem,but the feature for the boundray extrude is no necessary to be done by solid feature.i would like to do the boundray extrude with surfaces(if i were),and knit them to a whole solide part .in this way,you might not worry about if there are some extra material out there.anyway,i don't really think it is suit for you.
    Like • Show 0 Likes0
    Actions
- Jens Leander @ Louis Liu on Feb 26, 2013 4:16 AM
  Mark Correct
  Correct Answer
  
  Hello again i have drawn something in paint to illustrate what i am looking for:
  Like • Show 0 Likes0
  Actions
  - Charles Culp @ Jens Leander on Feb 26, 2013 9:43 AM
    Unmark Correct
    Correct Answer
    Jens,
    
    I have a newer version of SolidWorks than you, so you might not be able to open this file. I have attached it anyway. Finish the sketch in Sketch 7 by mirroring it to create a complete enclosed sketch. Then extrude up, with an End Condition of "Up to Body". Then select the chair as the body to terminate the extrude.
    
    Now you can use the Fillet command to create a fillet around the base. There is an additional option for Curvature Continuous in the fillet, and I would prefer to keep this on. Unfortunately, the shape of the seat bottom does not allow for a large fillet with this option turned on. Consider deleting these faces, and replacing with a boundary surface, with end conditions of curvature continuous.
    Attachments
    Stol_cc.SLDPRT.zip895.3 KB
    Like • Show 0 Likes0
    Actions
    - Jens Leander @ Charles Culp on Feb 27, 2013 2:56 AM
      Mark Correct
      Correct Answer
      Thank you so much for that Charles Culp. It was a very nice and SIMPLE way to solve this. I will mark your post as correct.
      
      But.. I am still looking for some other ways of doing this, maybe something a bit more advanced with some surfaces or something which I can learn from
      
      Thank you again Charles
      Like • Show 0 Likes0
      Actions
      - Charles Culp @ Jens Leander on Feb 27, 2013 9:41 AM
        Mark Correct
        Correct Answer
        Sure. Instead of extending the extrude "up to body", do it a fixed distance, about 90 mm from the seat bottom (I used 200mm).
        
        Then, create a sketch on the Top Plane that is the shape you want to be your split line on the seat bottom. Then use split line to create this on the seat bottom (see image below).
        
        Now you can use Boundary Boss/Base to create a nice, smooth, and fully curvature continous transition between the two.
        
        Except this gives an error!
        
        So now we must use surfacing tools. Delete Face to each section.
        
        Then use Surface>Boundary Surface
        
        And finally Surface>Knit to create it back to a solid.
        
        I have also uploaded this file again.
        Attachments
        Stol_cc.SLDPRT.zip1.8 MB
        Like • Show 0 Likes0
        Actions
        Jens Leander @ Charles Culp on Feb 28, 2013 4:36 AM
        Mark Correct
        Correct Answer
        Thansk again Charles.
        
        Your last post really gave me something I was playing around with the first thing you did (boundary boss/bass). I changed some of the sketches and then i had this:
        
        But when taking a closer look at the other side i explored this:
        
        Marked with blue:
        
        How would you get rid of that thing?:)
        
        I have attached the SW file
        
        And last thing; in your last post you figured it all out with surfaces. But how do you "fill" up so it will not just be a shell anymore but a solid?
        
        I really appreciate your help thank you!
        Attachments
        Chair_v2.SLDPRT.zip1,009.9 KB
        Like • Show 0 Likes0
        Actions
        James Moynagh @ Jens Leander on Mar 1, 2013 6:51 AM
        Mark Correct
        Correct Answer
        Jens,
        
        If you look at Charles model he has delete face action after the extrusion for the stand part, that is how he got it back to a surface, you missed out that part, so the should get rid of that extra material which is sticking through on the seat of chair.
        Like • Show 0 Likes0
        Actions
        Charles Culp @ Jens Leander on Mar 5, 2013 9:21 AM
        Mark Correct
        Correct Answer
        Yes, sorry, I never responded. The area above the seat is caused because you used solid boundary, instead of surface boundary. I suggest using surface boundary, then you won't have this problem.
        
        The way to convert surfaces to solid is to use the Surfacing>Knit tool. Then check the "make solid" checkbox when you knit all the surfaces together, if they enclose a solid. This is the last image in my above post.
        Like • Show 0 Likes0
        Actions
Louis Liu Mar 4, 2013 10:49 PM
Mark Correct
Correct Answer
Jens and Charles,

i really admire the way which Charles Culp has done in file Chair_v2.sldprt.as James said,the seat has to be cut a little bit extra material
which is sticking through on the seat of chair.my opinion is that Chair_v2.sldprt has no problem,but the feature for the boundray extrude is no necessary to be done by solid feature.i would like to do the boundray extrude with surfaces(if i were),and knit them to a whole solide part .in this way,you might not worry about if there are some extra material out there.anyway,i don't really think it is suit for you.
Like • Show 0 Likes0
Actions

Need help with surface

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