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(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

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  • $\begingroup$ 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 '20 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 '20 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 '20 at 14:33
  • $\begingroup$ filedropper.com/cam i hope zip is O.K.? $\endgroup$ Apr 5 '20 at 16:29
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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

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    $\begingroup$ worked like a charm. thanks! $\endgroup$ Apr 8 '20 at 9:29

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