2 Replies Latest reply on Feb 2, 2013 8:31 PM by Ray Fletcher

    rules of relations

    Ray Fletcher

      I am experiencing much confusion over relations in SW sketches. I have a profile sketched on the front plane, a circle.   I have a spline on the right plane, arcing over the front. What I am trying to do is pierce the end of the spline located on the right plane,  through the edge of the circle on the front plane. The cursor will sometimes inference the end of the line, sometimes it won't. Sometimes when I am able to get the desired points displayed in the relations window, the options are grayed out/disabled...but sometimes they're available. I don't understand.

       

      What are the rules here?

       

      thanks!

       

      Ray

        • Re: rules of relations
          John Sutherland

          The word Pierce has a specific meaning in SW, and I suspect that you are using it erroneously.  That may be a problem if you are looking in SW Help.

           

          Every Line element terminates at a Point, so I assume Splines do also.  It seems to me that you want the Line terminating Point to coincide with the Circle element.  This can happen only at a point on the circle element.  You must define one.  Your choices include a) placing a sketch Point; b) splitting the circle element which will create a Point at the split; and c) creating a Virtual Sharp.  There may be others.

           

          The mere intention that elements should coincide is not sufficient for SW.  There must be points which you can Relate Coincident.

           

          An Inference is not a Relation, it is merely a positioning based on a guess.

           

          When sketching a line element, you can allow SW to infer Horizontal, but you will not find a Horizontal relation when you Display Relations.  You must specify a Horizontal relation.