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    Help with bevelling a non-rectangular solid

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    • M Offline
      MarkL
      last edited by

      Assume I have a component which has as it's faces a regular pentagon, and is a solid of thickness X. The starting solid, before bevelling

      I wish to bevel all five vertical faces of this solid with a bevel of angle Z. This is the desired effect, but not precise

      Now, I can use the scaling tool with "uniform about center point", to achieve the bevel effect you see above, but I cannot control the angle precisely. Perhaps with enough math, and knowing the dimensions X, the angle Z, and some trig, I could calculate the scaling factor necessary for one face to achieve the desired angle Z, but my attempts so far have not yielded the necessary precision.

      If my component had 90 degree corners (a square or rectangle), I could inscribe a line on one vertical face at the desired angle and use the push/pull tool to remove material to create the bevel. However, since the angles of a pentagon are not 90 degrees, but instead 108 degrees, this does not yield the desired result. Push-pull doesn't like non-right angles

      Fredo's excellent RoundCorner plugin will bevel correctly, but will not accept an angle measure as a parameter. It seems to always make a 45 degree bevel.

      RoundCorner ... nice, but wrong angle

      Any advice?

      (My goal is to design a regular dodecahedron out of wood ... each face will be a pentagon of X thickness, with edges bevelled at 31.72 degrees so they fit together at the desired dihedral angle of 116.56 degrees when assembled.)

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      • brooklynia373B Offline
        brooklynia373
        last edited by

        could you offset the top surface, select the outer edges (as shown) and drag them downwards while locked in z axis?


        su.PNG

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        • BoxB Offline
          Box
          last edited by

          Use the Protractor to set your angle, then use follow me on a pentagon.
          Note ctrl will toggle the sides of the pentagon.

          https://i.imgur.com/9uuPwAp.gif

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          • M Offline
            MarkL
            last edited by

            @box said:

            Use the Protractor to set your angle, then use follow me on a pentagon.
            Note ctrl will toggle the sides of the pentagon.

            Oh now that is sweet! A lot to digest for a neophyte like me, but wow. Beautiful!

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