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motion with groves

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PRuggiero

PRuggiero

Mechanical
Oct 8, 2007
64
hello,

I am working on this two piece system, a cylinder and then a female part shown below. The extruded cylinders on the female part ride in the swept groves on the cylinder

cylinder.jpg


female.jpg


I have been trying to get this to work in cosmos motion but am having problems using the contact feature. I can't get curve to curve contact to even allow me to choose what I want. The point to curve contact is what I have been messing with. I chose the outer surface of one of the extruded cylinders as the point, (not sure how it lets me choose a surface as a point), and then I chose one of the surfaces on the swept cut (you can see which one i chose in the picture below). When I go to run the simulation and get lucky, meaning it actually does something, all it does is moves the cylinder to a random location irrespective of what forces/motions i have applied if any. I was hoping you guys would know a way that I could get this cam/grove thing to work.

assembled.jpg


Thanks,
Pete
 
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Hi,
as far as I know, this kind of simulation requires "surface-to-surface" contact. "point" contact choosing a surface should puts the point at the area's centroid.
Moreover, in your case the target surfaces in the groove are not only one, but all three, unless you are sure that the cylinder will always touch on one side only.
The full "surf-to-surf" contact type is enormously more expensive in terms of computing resources, but I believe you have no choice.

Regards
 
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Cbrn,

Are you talking about the 3D contact option, if so on that it seems as if I can only choose components not surfaces to make contact with and it doesn't mate them together when I do it, it just won't let them go past each other. I am starting to think that it can't be done in Solidworks as it stands now.

Thanks,
Pete
 
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Hi,
sorry, I mixed up terms as I was recalling that out of my memory (having stopped using Cosmos family of products in mid-2005).
Yes, the option you are speaking about is "3D etc...", but even if I can't exactly remember how I used to do that, your application is feasible. There is also a tutorial about something very similar somewhere.

Regards
 
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