mating a cylinder and a sphere? 1

skanskan · Nov 9, 2011

Hello

I have two extruded bodies, a cylinder and a sphere.
I'm trying to apply a mate in order to avoid that they could penetrate each other.
I've tried to get it by creating a limit distance mate between their surfaces but I'm not allowed to do that.
How can I do it?

I know I could try
move components->physical dynamics or collision detection, or even use a simulation, but I'd like to do it with standard mates.

thanks

CorBlimeyLimey · Nov 9, 2011

A bit more information or an image is in order.

Is the sphere axially or radially aligned with the cylinder?

What movement is involved? Axial, radial or revolution.

You may have to use reference planes, surfaces and/or sketch elements with a (possibly Limit) mate scheme.

skanskan · Nov 9, 2011

Hello

Actually, I was speaking in general,
How can I mate the surface of two bodies in order to avoid them to penetrate each other when I move them.
I've said the cylinder and the sphere just to give an example.
The cylinder could have any orientation, thus I can't reduce the problem measuring the distance between two planes.

steinmini · Nov 9, 2011

If the sphere was created by using revolved boss/base feature, the center line used to revolve the circle/arc should be also useful to insert a reference geometry, an axis, for example or a plane, or even two planes. To do that, after creation of the sphere, click on "show sketch", then, go to "Insert"> reference geometry > axis (or reference plane...) Save and then, you should be able to use that reference geometry for mating with a cylinder, which also can have some sort of reference geometry inserted/applied...

kellnerp · Nov 10, 2011

First of all, it is impossible to extrude a sphere. Revolve is probably what you meant.

Since the surface of a sphere contains no information about orientation the best we can do is explain how to mate the end or side of a cylinder to the surface of a sphere.

The contact mate comes to mind. Simply pick a surface/face on each body and pick mate/contact. Click OK. The two should be mated.

Note: Contact mates between two curved bodies such as this have multiple solutions.

If you are trying to get a limit mate that works with curved surfaces you are out of luck, except with collision detection.

TOP
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skanskan · Nov 10, 2011

Hello

kellnerp, you are right, I mean exactly what you say,
Getting a limit mate that works with curved surfaces, but not collision detection.
Do you know if ProEngineer or Inventor support it?

kellnerp · Nov 10, 2011

I think it is possible to do a limit mate between a cylinder and sphere. I have come to that conclusion after some thought. However, it requires some complex constructions in the assembly to accomplish this. No assumption is necessary for the orientation of the sphere, but an assumption has to be made about the cylinder. The cylinder and the sphere have to be known to come into contact for this to work.

I will have to do some work to check this out, so I may not have the answer right here and right now.

May I ask what the problem is that you are trying to solve?

TOP
CSWP, BSSE

http://www.engtran.com

http://www.niswug.org

http://www.linkedin.com/in/engineeringtransport

Phenom IIx6 1100T = 8GB = FX1400 = XP64SP2 = SW2009SP3
"Node news is good news."

skanskan · Nov 10, 2011

Hi
I'm just learning Solidworks and I was tinking in that problem with mates.

I know that the complication arises from the different orientations that can have the cylinder.

http://files.engineering.com/getfil...a2c5-ac24fc8b99f2&file=mate_ball-cylinder.rar