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Thread: Stretching a cylinder

  1.    #1
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    Question Stretching a cylinder

    Hi
    Not sure if i am posting this question on the right topic, but here it is
    Im trying to create an angular parameter in order to control the way the edges of my cylinder are going to move (two images attached to make things easier to visualize).
    The way i did worked perfectly with a rectangle, as you can see in the file attached, but when i tried to make the same way with a cylinder i got errors and some results that i couldnt understand.
    The image "Cylinder" has some itens highlighted, a reference plane and one of the cylinders edge. I got erros when trying to do the following things: Trying to stretch one edge to two reference planes (i was able to stretch to only one reference plane), creating the same angle parameter on the edge highlighted in red (having one angle parameter in each face of my cylinder).
    Obs: i'm attaching the .rfa file with both objects quoted in this topic.

    Is there a better workflow to work with this cylinder? Any tips that could save me?

    Thanks
    Arthur
    Attached Thumbnails Attached Thumbnails Stretching a cylinder-cylinder.png   Stretching a cylinder-rectangle.png  
    Attached Files Attached Files

  2.    #2
    Forum Addict sdbrownaia's Avatar
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    I think using a void to cut the angle out would keep the cylinder shape intact.
    Mengelmn likes this.

  3.    #3
    Mr. Revit OpEd
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    Used a Extrusion for the rectangle from the top and an extrusion from the side or sweep for the cylinder? The cylinder can't reconcile the angle because it would need miter where that change of direction would occur. Your path would need to be segmented so the angle would provide a valid path (2 parts).

    If you want to carve off the end at an angle, then the void that Scott suggests is necessary. Keep in mind the void might not carve off all of the cylinder nor provide an angle that will be complimentary to whatever it relates to.

    What are these forms in real life? Duct, pipe, railing...else?

  4.    #4
    Forum Co-Founder Alfredo Medina's Avatar
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    A truncated cylinder is a blend between a circle and an ellipse. I would do it like this, because I try to avoid voids:

    Stretching a cylinder-2019-08-16_20-13-56.png

    Edit: if you need the angle in both ends, then use an ellipse on both ends.
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    Last edited by Alfredo Medina; Yesterday at 12:37 AM. Reason: added family

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    Quote Originally Posted by Alfredo Medina View Post
    A truncated cylinder is a blend between a circle and an ellipse. I would do it like this, because I try to avoid voids:

    Click image for larger version. 

Name:	2019-08-16_20-13-56.png 
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    Edit: if you need the angle in both ends, then use an ellipse on both ends.
    What’s your reason to avoid voids?


    Sent from my iPhone using Tapatalk

  6.    #6
    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Mengelmn View Post
    What’s your reason to avoid voids?
    Performance: a void that cuts a solid is 2 objects to compute: the solid and the void. Assume that everybody at the office cuts solids with voids when it is not really needed. Now assume that you have a large project to manage, with 100 or 200 or more models, that you need to open, download, upload, often. The more objects to compute and more bits you have in your families, the longer you (and your coworkers) will be looking at that spinning wheel or progress bar to finish.

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