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Ball Bearings are very useful for things that must be supported and spin at the same time. This tutorial gives a how-to on making a ball bearing in Blender 2.6.

Step 1: First Circle

Blender is a free, powerful, 3D modeling program. If you have not already downloaded and installed it, do so.

Open blender and delete the default object. (Keep the camera and light if you want to render)

Click Add => Mesh => Circle. On the lower left panel you should see "Add Circle". Make this circle have 36 verticies and any radius.

Step 2: Basic Shape

Go into Edit Mode. Select all verticies. 

Click
 1. E (extrude) 
 2. Z (target axis)

Type 0.3 (Extrude Z 0.3). Enter.

With only the top verticies selected, scale to 0.9. Extrude Z 0.3. Scale 1.12.

In the left panel with the entire model selected, click Recalculate Normals.

Step 3: Taking Shape

Now duplicate your work OUT of Edit Mode. Scale X and Y to 1.5. In Edit Mode on the outer ring, select the middle row of verticies and scale it to 1.2.

Step 4: Make It Solid

Add the Solidify Modifier of desired thickness to both objects in Object Mode. Now apply it.

On both rings, apply subdivide smooth 4 times (w=> subdivide smooth) in edit mode. Select the middle ring vertex layers and click smooth vertex until there is a pretty slope.

Step 5: Add the Slippers

To add the balls, just Add => Mesh => UV Sphere. Now duplicate and move until it is perfect.
Self Aligning Ball Bearings Supplier <br>3D modeling will help to find the working procedure and to avoid defects before installing. <br>www.hrbearings.net/self-aligning.html <br>
very cool, can you do any simulations with blender using this model?
If you are talking about animation, yes, you may use this model like every other model in blender... So yes.

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