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  1. #1
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    Default Creating Square-to-Round ductwork

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    Alright, I'm trying to make a section of ductwork that is a transition from 12x8 square to 8 dia round. I've tried all kinds of methods, but nothing has really gotten me an accurate, realistic model. Any insights?

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    oh, and just for clarification (so I don't get laughed at ), I'm trying to do this in 3d.

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    http://www.hvacware.net/pvfeature.html

    Try with demo.
    BTW it is ton of them, some very affordable

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    Quote Originally Posted by blood86x View Post
    oh, and just for clarification (so I don't get laughed at ), I'm trying to do this in 3d.
    here is a quick one I did with rule surf. it is 12x8 to 8 round.

    I am sure one of the guys has a lisp proggy that will do it faster though.
    Attached Files

  5. #5
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    surely using 2007 you can use the loft command to do this?

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    Quote Originally Posted by yedan View Post
    surely using 2007 you can use the loft command to do this?

    2007 does not play well with my video card in my machine here at home. Will give it a go at work though. I have tried the loft command only a couple of times and don't recall it being able to transition from rectangle to circle.

  7. #7
    Super Member yedan's Avatar
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    the loft command can be used for modelling the transition between many different shapes , you can start with a circle and end up with a 6 pointed star going through rectangular and triangular if you wanted, you have to use closed plines i believe, i dont think it wil work through regions

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    Default Solid Square-to-Round

    The difficult portion of a square-to-round is the creation of the four cones that connect the square points to the round. Most often these cones are eccentric cones. At the following link, http://discussion.autodesk.com/threa...sageID=5466872, I display the methods I have used to create eccentric cones. It also shows some of the Transition shapes you can create once you master the eccentric cone.

    IMPORTANT: At the end of that discussion I provide the code necessary to create Solid Transitions of the common duct shapes. (look for the latest posted code). The code has now been tested on r14 thru A2K7.

    If you have any comments regarding the code, please reply to the link I provided above.

    Regards,
    Ronso
    A2k7
    Regards,
    Ronso
    A2k16

  9. #9
    Senior Member matramurena's Avatar
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    You can use the loft command for this. I drew 2 squares of 12x8 and 2 circles of 8 and then lined them on a path. (I use 2 so that you get straight ends)

    Next I made an offset of all of these forms of 0.2 and then I lofted the first series and after that the second series. So I had 2 of the ductworks, one of which a little bit smaller then the other....

    This shapes I subtracted and what I got was the following picture...
    Attached Images

  10. #10
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    Great command LOFT, they pinched it from it's brother Inventor.

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