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Centerline between 2 different curves

Question asked by Wesley Prins on Mar 19, 2008
Latest reply on Oct 19, 2016 by Rob Edwards

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Hello,

I want to draw a centerline between 2 curves like shown in the picture. But i got no idea how. Is there a function in SW who can do that?
Or maybe someone got a idea how to sketch it fast because i got an entire contour to do?
thx

Terry Howard Mar 20, 2008 3:26 PM

Correct Answer

I think this will be accurate, but I have not given it a lot of thought.....

Create a parallel plane 1" above the plane your splines are on.
Create a sketch on this parallel plane.
Select one of the original splines and do a Tools>Sketch Tools>Convert Entities. Exit out of this sketch.
Create a loft between the not converted spline on the first sketch and the spline on the second sketch.
Create a second parallel plane at 1/2" from the first.
Create a sketch on this plane. In this sketch insert a Tools>Sketch Tools>Intersection Curve, picking the lofted surface. This should be your midspline.

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Deepak Gupta Mar 19, 2008 9:50 AM

Hi Wesley,

Make lines at several points between the curves, plot points at the center of those lines and then draw a spline through those points. I don't think there is any direct method.

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cl.JPG13.8 KB

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Wesley Prins @ Deepak Gupta on Mar 19, 2008 9:56 AM

pfff thats gonna take some work then better get started maybe i will be finished before the weekend :s

If SW cant do this, does anyone knows a programme who can.
I will have to do this for more then 1 part.

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Dwight Livingston @ Wesley Prins on Mar 19, 2008 12:44 PM

Wesley

I played around with this and was able to use a sweep to show the centerline between two splines. One spline was the Path and the other a Guide. I swept a thin triangle that had it's point halfway between the two two splines.

Dwight

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between splines.jpg41.8 KB

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Wesley Prins @ Dwight Livingston on Mar 19, 2008 2:18 PM

Thank you dwight,

I tried it but it doesnt seem to work on a big scale, it doesnt goes through the center of the 2 lines everywhere. could you tell me which options you use. I used follow path and 1st guide curve. thats the only one who seems to work.

Your trick did gave me a good line more or less though, but now im stuck again.

I want to create a dxf with points(i made in SW). But when i make a drawing of the sketch and save it as dxf it doesnt show the points in the dxf.(probably should go to another topic but since im here)

Is there something i have to change in the save as options?

Thx in advance

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Terry Howard @ Wesley Prins on Mar 20, 2008 3:26 PM

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Dwight Livingston @ Terry Howard on Mar 20, 2008 4:01 PM

Hey, T H. I like your way better.

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Terry Howard @ Dwight Livingston on Mar 20, 2008 4:12 PM

Dwight,
I am not sure this is accurate though.
My other method for creating this was to make a Planar surface and add Face Curves (make sure you are in a 3d sketch first or you will end up with a 3d sketch for each curve), then draw a spline through the centerpoints. I do not get the same spline though, and I am not sure why.

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Wesley Prins @ Terry Howard on May 7, 2008 1:31 PM

Thx TH

This method works fine for me, i tried it on serveral parts now and i havent seen anything wrong.

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Rob Edwards @ Terry Howard on Oct 19, 2016 8:00 AM

Thankyou Terry

Thats perfect for something I've been wrestling with I offset my first plane 100 and then I could use the intersection plane offset as a percentage

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9 Replies

Deepak Gupta Mar 19, 2008 9:50 AM
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Correct Answer
Hi Wesley,

Make lines at several points between the curves, plot points at the center of those lines and then draw a spline through those points. I don't think there is any direct method.
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- cl.JPG13.8 KB
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- Wesley Prins @ Deepak Gupta on Mar 19, 2008 9:56 AM
  Mark Correct
  Correct Answer
  pfff thats gonna take some work then better get started maybe i will be finished before the weekend :s
  
  If SW cant do this, does anyone knows a programme who can.
  I will have to do this for more then 1 part.
  Like • Show 0 Likes0
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  - Dwight Livingston @ Wesley Prins on Mar 19, 2008 12:44 PM
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    Wesley
    
    I played around with this and was able to use a sweep to show the centerline between two splines. One spline was the Path and the other a Guide. I swept a thin triangle that had it's point halfway between the two two splines.
    
    Dwight
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    between splines.jpg41.8 KB
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    - Wesley Prins @ Dwight Livingston on Mar 19, 2008 2:18 PM
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      Thank you dwight,
      
      I tried it but it doesnt seem to work on a big scale, it doesnt goes through the center of the 2 lines everywhere. could you tell me which options you use. I used follow path and 1st guide curve. thats the only one who seems to work.
      
      Your trick did gave me a good line more or less though, but now im stuck again.
      
      I want to create a dxf with points(i made in SW). But when i make a drawing of the sketch and save it as dxf it doesnt show the points in the dxf.(probably should go to another topic but since im here)
      
      Is there something i have to change in the save as options?
      
      Thx in advance
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      - Terry Howard @ Wesley Prins on Mar 20, 2008 3:26 PM
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        Correct Answer
        I think this will be accurate, but I have not given it a lot of thought.....
        
        Create a parallel plane 1" above the plane your splines are on.
        Create a sketch on this parallel plane.
        Select one of the original splines and do a Tools>Sketch Tools>Convert Entities. Exit out of this sketch.
        Create a loft between the not converted spline on the first sketch and the spline on the second sketch.
        Create a second parallel plane at 1/2" from the first.
        Create a sketch on this plane. In this sketch insert a Tools>Sketch Tools>Intersection Curve, picking the lofted surface. This should be your midspline.
        
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        Dwight Livingston @ Terry Howard on Mar 20, 2008 4:01 PM
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        Hey, T H. I like your way better.
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        Terry Howard @ Dwight Livingston on Mar 20, 2008 4:12 PM
        Mark Correct
        Correct Answer
        Dwight,
        I am not sure this is accurate though.
        My other method for creating this was to make a Planar surface and add Face Curves (make sure you are in a 3d sketch first or you will end up with a 3d sketch for each curve), then draw a spline through the centerpoints. I do not get the same spline though, and I am not sure why.
        Like • Show 0 Likes0
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        Wesley Prins @ Terry Howard on May 7, 2008 1:31 PM
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        Thx TH
        
        This method works fine for me, i tried it on serveral parts now and i havent seen anything wrong.
        
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        Rob Edwards @ Terry Howard on Oct 19, 2016 8:00 AM
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        Thankyou Terry
        Thats perfect for something I've been wrestling with I offset my first plane 100 and then I could use the intersection plane offset as a percentage
        Like • Show 0 Likes0
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Centerline between 2 different curves

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