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Thread: bored pier family creation - it extrudes up, not down

  1. #1
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    bored pier family creation - it extrudes up, not down

    Apologies - I'm very new to Revit and Family creation. Trying to create a bored pier family (a simple concrete cylinder shaper that I want to use as an isolated footing under columns).

    I used Structural Foundation as the template, have created a reference plane called "Bottom" about 600 below the reference plane called "Top" which is at the Ref Level 0 datum. I dimensioned between those 2 reference planes, added a parameter called "Depth", and tested it so when I change the parameter the planes successfully do vary as the dimension varies.

    On the "Top" reference plane I created a circular reference line and gave it a "Diameter" parameter that also successfully adjusts diameter. All good so far.

    Now for the extrusion. Selected the circular reference line using "pick lines", contraints extrusion start was 0, and I set extrusion end to "Depth". I was sure I was on the right track here, but it's where everything went pear-shaped.

    The extrusion starts at "Top", but instead of going down to "Bottom", it goes up! Changing the parameters for "Depth" work in that the distance between the top and bottom reference planes change too, and also the depth of the pier change to match, but it always has bottom at 0. Like it's mirrored about the zero datum.

    Hope that description makes sense. Anyone able to shed some light on what I'm missing?

  2. #2
    Forum Addict elton williams's Avatar
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    Reference lines have a direction, similar to how a UV works in other programs. It depends on whether you draw your ref plane/line from left to right or right to left. Setting the extrusion depth in the properties browser to a predetermined parameter will cause the extrusion to extrude in the positive direction of the reference plane/line.
    you can redraw your ref line in the opposite direction and recreate your extrusion, but you'll find it a lot easier -now and in the future- to go to an elevation view and use the align tool (and hit the lock icon) for each end of your extrusion to lock it to the relevant ref planes, top and bottom.
    Hope that makes sense.

  3. #3
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    I don't understand. The bottom reference plane was not "drawn" per se. I used create->datum->reference plane and entered an offset, and clicked just below the top reference plane to get offset below. Not sure how I can do that in the opposite direction.

    I tried to follow your last recommendation there. Went to an elevation and tried using align, but got errors because the extrusion depth went to zero, or negative values.

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    Found out what I was doing wrong. Instead of using the "Depth" for the extrusion end, I stopped using the parameter. This allowed me to align bottom and top, lock them to those ref planes. All good now. Thanks mate.

  5. #5
    Forum Addict elton williams's Avatar
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    Quote Originally Posted by troypiggo View Post
    I used create->datum->reference plane and entered an offset, and clicked just below the top reference plane to get offset below. .....
    What that does is copy the existing element to your specified offset. In that case the ref plane direction would be the same as the original. Good that you figured it out.

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