(solidworks files here)

I've made a small assembly thet mooves smoothly manually, but when I try to moove it the same way is motion study, it collides is a strange way... what can be the cause of that?manually

enter image description here

  • $\begingroup$ This looks like you have a tangent constraint that is bistable. Add aimit distance mate to stop the runner from being able to fall lower than the minor diameter of the cam. In future please include a full screenshot so we can see how your mates are set up, or even better include a link to download your problematic model! $\endgroup$ Apr 5, 2020 at 9:55
  • $\begingroup$ I understand the logic and it did help a lot! but now there are certin points in time when it doesn"t seem to run smoothly, marked in a red mark in the timeline (is there an option to attach a photo or the assembly to a comment? $\endgroup$ Apr 5, 2020 at 13:36
  • $\begingroup$ I usually recommend filedropper.com as the easiest way to share files - I don't have access to your google drive, you didn't make the link public. To include a photo in a comment, upload directly to e.g. imgur, and paste a link here. $\endgroup$ Apr 5, 2020 at 14:33
  • $\begingroup$ filedropper.com/cam i hope zip is O.K.? $\endgroup$ Apr 5, 2020 at 16:29

1 Answer 1


General points to note: The "Standard" mates are more robust than the Mechanical mates, and should be used wherever possible. A cam should have one continuous face, you can use the fitspline tool to create this.

See below for how I fixed your model:

fix Cam Screencap

  • 1
    $\begingroup$ worked like a charm. thanks! $\endgroup$ Apr 8, 2020 at 9:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.