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Projected Curve

Question asked by Santiago Abascal on Mar 28, 2014
Latest reply on Mar 31, 2014 by Santiago Abascal

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Hello

I am having a trouble with a projected curve, i am modeling audi r8, and I am using 2 sketches on 2 differnt planes and the two lines in the sketches are coincident but when I project the curve the projected curve is short by a tiny bit not allowing me to sweep along, I have re-drawn it a few time to make sure the sizes are correct but i cant figure out why the curve is short. I already try to sketch the missing part in a 3d sketch but it didnt work, i hope someone could help me. I attach the image and my solidworks file.

Erik Bilello Mar 28, 2014 9:08 PM

Correct Answer

Santiago,

Your part gives me the earlier version warning so I can't save and post a part you can open.

I just edited your sketch, Croquis1, and added the construction line, so the line is in the same plane as your sketch. If you edit the sketch in your part and add a vertical construction line at the left end of the spline, and then make the spline tangent to the line, the spline should then arch up and to the right of the construction line. That solved the problem for me.

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R8_Body.SLDPRT.zip2.1 MB

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Nathan Rollins Mar 28, 2014 11:56 AM

Have you ever used a projected (3D) curve as a sweep path? I did not think this was possible. Hopefully I am wrong and someone will educate me (us).

Do your sketches come to a vertical tangent at their ends? This might be a way to trouble shoot - take away the vertical tangency at the end points and see if you get what you expect. Maybe a 0.1° end condition is acceptable and will let the feature work?

Also, maytbe try extending the planar sketches beyond what they need to be - do this sequentally (first one sketch, then the other ) to see if either one is the culprit...

Many times you need to trick the software and getting creative with your tricks can help. I look forward to seeing what the real experts have to say. Good thing it is Friday (here...)

-Nate

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Patrick O'Hern @ Nathan Rollins on Mar 28, 2014 4:32 PM

I think Nathan is right, you can't sweep along a projected curve. What you should be able to do though, is make a 3D sketch after your curve and use Convert Entities. This creates a sketched 3Dcurve, and you should be able to sweep along it.

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Erik Bilello Mar 28, 2014 6:51 PM

Santiago,

You should be able to sweep along a projected curve. I've done it plenty of times.

The reason your curve is coming up short is that the left end of the spline in sketch Croquis1 is just a little bit past the end of Sketch14. I drew a vertical construction line (colored pink) through the end point of the spline. You can see the spline is just to the left of it in the area that corresponds to the missing part of your projected curve.

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Santiago Abascal @ Erik Bilello on Mar 28, 2014 7:41 PM

Hello Erik

Thanks a lot for your help. The problem is that i dont understand in which plane i need to draw the line you are talking about.

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Erik Bilello @ Santiago Abascal on Mar 28, 2014 9:08 PM

Santiago,

Your part gives me the earlier version warning so I can't save and post a part you can open.

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Santiago Abascal @ Erik Bilello on Mar 31, 2014 2:59 PM

Hello Erik

Sorry to answer until now, but i only have the program on the computers of my university. Thanks a lot for your help, i finally made it!!

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R8.png548.6 KB

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6 Replies

Nathan Rollins Mar 28, 2014 11:56 AM
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Correct Answer
Have you ever used a projected (3D) curve as a sweep path? I did not think this was possible. Hopefully I am wrong and someone will educate me (us).

Do your sketches come to a vertical tangent at their ends? This might be a way to trouble shoot - take away the vertical tangency at the end points and see if you get what you expect. Maybe a 0.1° end condition is acceptable and will let the feature work?

Also, maytbe try extending the planar sketches beyond what they need to be - do this sequentally (first one sketch, then the other ) to see if either one is the culprit...

Many times you need to trick the software and getting creative with your tricks can help. I look forward to seeing what the real experts have to say. Good thing it is Friday (here...)

-Nate
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- Patrick O'Hern @ Nathan Rollins on Mar 28, 2014 4:32 PM
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  Correct Answer
  I think Nathan is right, you can't sweep along a projected curve. What you should be able to do though, is make a 3D sketch after your curve and use Convert Entities. This creates a sketched 3Dcurve, and you should be able to sweep along it.
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Erik Bilello Mar 28, 2014 6:51 PM
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Correct Answer
Santiago,

You should be able to sweep along a projected curve. I've done it plenty of times.
The reason your curve is coming up short is that the left end of the spline in sketch Croquis1 is just a little bit past the end of Sketch14. I drew a vertical construction line (colored pink) through the end point of the spline. You can see the spline is just to the left of it in the area that corresponds to the missing part of your projected curve.
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- Santiago Abascal @ Erik Bilello on Mar 28, 2014 7:41 PM
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  Correct Answer
  Hello Erik
  
  Thanks a lot for your help. The problem is that i dont understand in which plane i need to draw the line you are talking about.
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  - Erik Bilello @ Santiago Abascal on Mar 28, 2014 9:08 PM
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    Correct Answer
    Santiago,
    
    Your part gives me the earlier version warning so I can't save and post a part you can open.
    I just edited your sketch, Croquis1, and added the construction line, so the line is in the same plane as your sketch. If you edit the sketch in your part and add a vertical construction line at the left end of the spline, and then make the spline tangent to the line, the spline should then arch up and to the right of the construction line. That solved the problem for me.
    Like • Show 2 Likes2
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    - Santiago Abascal @ Erik Bilello on Mar 31, 2014 2:59 PM
      Mark Correct
      Correct Answer
      Hello Erik
      
      Sorry to answer until now, but i only have the program on the computers of my university. Thanks a lot for your help, i finally made it!!
      Attachments
      R8.png548.6 KB
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