4 Replies Latest reply on May 29, 2014 2:52 PM by Mark Bund

    SW 2014 concentric mate problem

    Mark Adair

      Hi, first time using this forum so hopefully someone can help-

      the problem im having is that when i mate two conical cylinders- i would expect the default mate to be concentric.

      however SW 2014 is doing the coincident mate as default, and if coincident isnt possible (due to other mates preventing it) its then opting for a parallel mate.

      The parts im mating ive been working on for a long time now (through SW 2011, 2012 and 2013) and never had this issue and these parts havent changed at all so its a new problem that has only arisen from the 2014 upgrade.

      I missed the first two 2014 upgrades so went straight from 2013 to 2014 sp2.  Dont know why that would matter but it may help.

      Its hardly the worst problem ever but given the assemblies im working on have a lot of concentric mates and its making the whole thing a lot slower.

      Any help would be much appreciated- is this a issue or is it something i can alter in the options?

      thanks in advance

        • Re: SW 2014 concentric mate problem
          Jeff Holliday

          First - welcome to the forum!

           

          I just tried with 2 conical parts and the default was concentric. These parts were very simple and created by revolving a sketch around an axis. I suppose it is possible if the parts were modeled in another way, that preference may shift to another default mate.

           

          I'm on 2014 SP 2.

            • Re: SW 2014 concentric mate problem
              Mark Adair

              Thanks for checking on this.  Ive done similar tests with simple peg and hole shapes and had the concentric mate working fine

               

              The problem for me is that i only updated 3 days ago and i was working with the exact same parts that i was working on in 2013 (absolutely no changes at all to the model) and that issue wasnt there.  For some reason it just seems that the parts i have been using previously no longer want to mate concentrically (they will mate but only if i specifically select it and not defaulting to this as they had previously).

               

              Never mind though i guess its just one of those things.  good to know that its working elsewhere though so it must just be something on these parts

                • Re: SW 2014 concentric mate problem
                  Chad Parsons

                  I've found the same issue, creating a concentric reducer shape, that won't remain concentric when the diameters at each end become greater in difference. I tried many different work arounds but the only that worked was creating the part in my 2013 version and opening it in 2014.

                  The lofted bend in SW 2014 has a few other bugs that I avoid by using 2013 to create that part.

              • Re: SW 2014 concentric mate problem
                Mark Bund

                SW 2014 seems more sensitive to the features you are mating. 

                 

                1.  It tends more towards coincident mate if you use a round edge of one of the parts instead of a round body (which makes sense it gives you more control over the logical way it should be mated, I think).  A coincident mate can kill 2 birds with one stone by mating in an axis (x y or z) AND keeping them concentric.

                 

                2.  The parallel mate gets defaulted to when another concentric mate will fail (which I was hoping they would add.....flat surfaces in 2013 first errored out when I tried to do a parallel with a distance between them ....it should have defaulted to parallel next IMHO). 

                 

                So if 2 parts have 2 alignment holes, you can always do 1 concentric mate no problem but if they are not the same distance or angle, it will default to parallel (which my brain doesn't really work very well with, It just doesn't compute parallel relations between 2 holes very well but I'm sure it's perfectly legit)

                 

                Hope this helps.