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Thread: Aligning radius

  1. #1
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    Aligning radius

    I am working on a family that contains a flange and a nested plate. I am stumped on how to align the radius on the nested plate with the radius of the flange. The radius parameters are linked, but there is still a gap.
    Also, round edges are being segmented. In the image you can see the circular ref line and the segmented edges of the flange and plate. Is there a setting for arc smoothness or number of segments?

    Thanks in advance
    Attached Thumbnails Attached Thumbnails Aligning radius-flange-plate-gap.jpg  
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    Administrator Munkholm's Avatar
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    Hi Randy.

    • In the plate family, add a ref. plane at the quadrant of the arc segment - you can calculate the exact location with this formula: Plate Rad - (sqrt(Plate Rad ^ 2 - (Width ^ 2 / 4)))
    • In the flange family, add a ref. plane at the quadrant of the flange - you can use the A/2 parameter to place it from the center of the flange.
    • Now just allign and lock the two newly created ref. planes, and you´re good to go.


    Actually, I already did it to QC the formula, so just have a look at the attached.
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    My goodness that was a fast reply Klaus, thank you. Do you think my approach to this family is correct, as far as using a nested plate rather than just building geometry inside the family? Would adding parameters inside the sketch of the flange be a better way to go?

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    Administrator Munkholm's Avatar
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    Believe that nesting is better for this family... but honestly I didn´t have that close a look at the family, don´t even know what it is - Just focused on the problem you mentioned

    Nesting is great for a number of scenarios:

    If the part (the nested family) is being used more than once in the same family.
    If the part needs to be arrayed.
    If the part needs to be swap-able.
    If the main family is "complicated" (to avoid lots of ref. planes and dimensions in the same family)
    Etc.

    BTW, the arc smoothness in Revit sucks, and you can´t adjust the number of segments... Good news is that it prints fine.

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    Outstanding answer. Thank you and enjoy the rep

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    Forum Co-Founder Alfredo Medina's Avatar
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    It is very difficult to attach that curve of the anchor plate to the curve of the ring, without getting into errors. An easier alternative is to model the anchor plate as a rectangle, let it stick inside the ring, control the length with parameters, and then simply join the rectangle with the ring. Revit will do the rest, hiding the seams between the two objects.
    Attached Thumbnails Attached Thumbnails Aligning radius-join.jpg  

  7. #7
    Administrator Munkholm's Avatar
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    Quote Originally Posted by Alfredo Medina View Post
    It is very difficult to attach that curve of the anchor plate to the curve of the ring...
    Took me less than 5 minutes - Pretty easy if you follow the instructions above Besides, I believe that you´d not be able to join the overlapping geometry if the plate is a nested family... which it is...

  8. #8
    Forum Co-Founder Alfredo Medina's Avatar
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    Good points, Munkholm, but I was offering the alternative to easily obtain the same result making the anchor plate as a simple rectangle, not nested, but as part of the same ring object. No need to use radial dimensions or formulas, and you get rid of the seam between the two parts. I just did it, too.

    By the way, great list of reasons to use nested families, in your reply # 4 above.

  9. #9
    Administrator Munkholm's Avatar
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    BTW Randy - Forgot to mention that you should never use "/" in the parameter names is you did in eg. "A/2"... what would happen if you try to use that parameter in a formula?? Yep, you can´t...
    Same thing applies to all other characters like +, -, *, etc. - Also avoid numbers in the names.
    So stick to letters and maybe underscores, but stay away from everything else.

  10. #10
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    Great tips and conversation guys, thank you both. I am all for simplifying the model, but it seems the decision to be made on which method to use can vary depending on the situation or even preference. It's easy to get excited about possibilities with collaboration like this.

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