1 Reply Latest reply on Oct 13, 2018 6:10 AM by ömür tokman

    Combining Variable Pattern and Equations

    Rob Edwards

      Hi All

       

      I don't use variable patterns very often, I've only really tinkered.

      But today I had to model a part that I've done before, but I've never been happy with and I thought I'd give a variable pattern a run out.

      I was delighted when I saw that it added all the dimensions into equations...

      ..  hopefully now I could control this tricky little fella

       

       

       

      This part is not really for production drawings, it's just meant to be indicative of what it might look like.

       

      It's a series half lapped boards, which are tapered and roughly decrease in width from the bottom to the top.

      All my previous attempts required a lot of manual adjustment so I'm quite pleased with this one.

       

      I discovered a few interesting things.

       

      Generating random numbers in equations is a bit crazy.  Say you have a global variable = RND(),, well every time you use it you get a different value.

      To overcome this I created sketch points using RND, and froze the sketch.  I then used driven dimensions in a subsequent sketch to capture these.

      Even when the sketch is frozen, the equations keep randomly mutating,,, it's a bit weird.

       

      To get a reducing width as we go up the door, I had to use triangular numbers, which took a while to wrap my head around.

       

       

       

      On top of the reducing width, we also have a random taper.

      To make sure that we don't end up with the leaning tower of pisa, the model orientates each board so as to be level(ish) as we proceed

       

       

      It was a lot of fun.  However at the moment it's just good for a fixed number of boards.

      Maybe I can configure it and use a Design Table to modify all the equations, but I reckon any enjoyment will be short lived if I start down that route.

       

      Anyway it's hometime..  My conclusions I think combining a variable pattern with equations makes for a powerful combo

       

      Goodnight!

       

      2016 attached