Page 1 of 2 12 LastLast
Results 1 to 10 of 16

Thread: Drawing 3D tapering curves

  1. #1
    Member
    Join Date
    2007-07
    Posts
    4
    0 Did you find this post helpful? Yes

    Default Drawing 3D tapering curves

    I'm somewhat new to the world of 3D in AutoCAD and I'm having trouble figuring out how to draw a tapering curve.

    I've attached pictures of what I'm trying to draw and what I have so far. I need to figure out how to draw the sloping curved front face of the hood. The front and sides slope towards the middle but the back is flat. Any hints on how to proceed?
    Attached Images Attached Images

  2. #2
    Certifiable AUGI Addict tedg's Avatar
    Join Date
    2005-06
    Location
    in the upper right corner
    Posts
    2,604
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by ryandov View Post
    I'm somewhat new to the world of 3D in AutoCAD and I'm having trouble figuring out how to draw a tapering curve.

    I've attached pictures of what I'm trying to draw and what I have so far. I need to figure out how to draw the sloping curved front face of the hood. The front and sides slope towards the middle but the back is flat. Any hints on how to proceed?
    You can extrude with an angle. So you could draw the "footprint" of the hood, extrude it up with a desired angle like 15 degrees or something, that would at least make the bottom part.
    Ted
    ____________________________________________________________________________________
    AutoCAD 2013 - REVIT Structure 2013 & 2014 - MicroStation V8i - Windows 7 Professional - (dabble with Inventor Professional 2013)

  3. #3
    Certifiable AUGI Addict tedg's Avatar
    Join Date
    2005-06
    Location
    in the upper right corner
    Posts
    2,604
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Ok, I played with it and came close. I did it in three pieces. Create the footprint of the hood, copy to an elevation where the hood starts to slope. Create the upper pipe part of the hood footprint. Extrude the first footprint up to the second footprint, Extrude the second footprint up with a taper (I used 20 degrees) to a point beyond the footprint of the upper pipe, and finally extrude the pipe foot print to the desired height. Then "union" all of it.

    See my enclosed example
    Attached Files Attached Files
    Ted
    ____________________________________________________________________________________
    AutoCAD 2013 - REVIT Structure 2013 & 2014 - MicroStation V8i - Windows 7 Professional - (dabble with Inventor Professional 2013)

  4. #4
    Certifiable AUGI Addict tedg's Avatar
    Join Date
    2005-06
    Location
    in the upper right corner
    Posts
    2,604
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Ok, even closer. I made the sloped hood part much bigger than it had to be so I could "slice" off the tapered back part so it will be flat. The yellow rectangle was my "slice" object.

    Does that help?
    Attached Files Attached Files
    Ted
    ____________________________________________________________________________________
    AutoCAD 2013 - REVIT Structure 2013 & 2014 - MicroStation V8i - Windows 7 Professional - (dabble with Inventor Professional 2013)

  5. #5
    Member
    Join Date
    2007-07
    Posts
    4
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by tedg View Post
    Ok, even closer. I made the sloped hood part much bigger than it had to be so I could "slice" off the tapered back part so it will be flat. The yellow rectangle was my "slice" object.

    Does that help?
    Great, that looks very close. Thanks for the help! The slicing rectangle was the trick I was looking for. What commands did you use to slice the extruded solid?

    I'll play around with it some more to see if I can get it perfect.

  6. #6
    Certified AUGI Addict jaberwok's Avatar
    Join Date
    2000-12
    Location
    0,0,0 The Origin
    Posts
    8,357
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by ryandov View Post
    What commands did you use to slice the extruded solid?
    There's SLICE or, maybe, SUBTRACT another solid.
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

  7. #7
    All AUGI, all the time
    Join Date
    2000-12
    Location
    Williamsport, PA
    Posts
    636
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by tedg View Post
    You can extrude with an angle. So you could draw the "footprint" of the hood, extrude it up with a desired angle like 15 degrees or something, that would at least make the bottom part.
    I would use Loft to create at least part of this geometry.
    http://home.pct.edu/~jmather/content..._Tutorials.htm
    AU 2007 Avatech Altogether Smarter Inventor On-line Challenge 1st Place
    Autodesk Inventor Certified Expert
    Certified SolidWorks Professional
    Williamsport, PA

  8. #8
    Active Member
    Join Date
    2008-01
    Posts
    95
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    I have attached a model of what I think you are after.
    Let me know & I will explain how I did it - Its a very crude looking model, which can easily be smatened up. I didn't have time to do a proper model!
    Attached Files Attached Files

  9. #9
    Certifiable AUGI Addict tedg's Avatar
    Join Date
    2005-06
    Location
    in the upper right corner
    Posts
    2,604
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by ryandov View Post
    Great, that looks very close. Thanks for the help! The slicing rectangle was the trick I was looking for. What commands did you use to slice the extruded solid?

    I'll play around with it some more to see if I can get it perfect.
    Quote Originally Posted by jaberwok View Post
    There's SLICE or, maybe, SUBTRACT another solid.
    Yup, what jaberwok said. ^^^^
    I used the "slice" command. Just to be on the safe side, I select the "keep both sides" option and erase the side I don't want.
    Ted
    ____________________________________________________________________________________
    AutoCAD 2013 - REVIT Structure 2013 & 2014 - MicroStation V8i - Windows 7 Professional - (dabble with Inventor Professional 2013)

  10. #10
    Certified AUGI Addict jaberwok's Avatar
    Join Date
    2000-12
    Location
    0,0,0 The Origin
    Posts
    8,357
    0 Did you find this post helpful? Yes

    Default Re: Drawing 3D tapering curves

    Quote Originally Posted by tedg View Post
    Just to be on the safe side, I select the "keep both sides" option and erase the side I don't want.
    I've always found that the safest way. Slightly slower but ...
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

Page 1 of 2 12 LastLast

Similar Threads

  1. Help: Tapering a curved cylinder
    By pawnee50 in forum AutoCAD General
    Replies: 2
    Last Post: 2009-11-25, 05:19 PM
  2. Tapering batt insulation using DCM
    By tsigler in forum ACA General
    Replies: 2
    Last Post: 2009-05-20, 02:10 PM
  3. drawing curves from a curve table
    By brian.59027 in forum AutoCAD General
    Replies: 3
    Last Post: 2007-08-01, 12:45 PM
  4. Tapering walls
    By afshin_samimi in forum Revit Architecture - General
    Replies: 5
    Last Post: 2005-06-02, 06:12 PM
  5. Tapering on Floors and Roofs
    By J. Grouchy in forum Revit Architecture - Wish List
    Replies: 0
    Last Post: 2005-01-25, 06:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •