Summary

Thanks to ThinkingandTinkering (https://www.thingiverse.com/thing:6898888) for the idea of a cylinder bearing and the profound explanation in the linked video on how to create in Tinkercad, very appreciated.

Some viewers of the video found serious wear when using the model. The wear is caused by the cone-shaped surface of the raceways and the cylindrical-shaped surface of the roller. They don’t match well.

This model here uses cone-shaped rollers that match the cone-shape of the raceway. As in the above referenced model, the rollers may be positioned in two ways which are roughly 90 degrees apart. The larger diameter of the roller always points to the outside of the race.

This model is more of a proof of concept than a ready to use mechanical part.

The following parts are needed:

• 10 (identical) rollers
• 2 (identical) races
• 1 cage
• 1 fixture (optional and intended when used without cage)

The geometry was designed with sketchometry. Many thanks to the Universität of Bayreuth for that amazing (and free) drawing tool!
The concept was realised with Tinkercad using code-blocks.
The model was printed on a Bambulab A1 with standard PETG. The parameter ‚seam position‘ was set to ‚Random‘ for a more even surface.

If you are interested in sketchometry visit the website www.sketchometry.org. You may import and open the attached drawing (Roller_Bearing.sketcho) in the browser. There are only 3 input parameters: the y-axis represents the axis of rotation with the point A being the top of the two cones (roller and one raceway). The point A’ is the respective point for the second position of the rollers and the second raceway. The point B ist the bottom point where the two raceways meet. Together with B’ this defines the diagonal size of the roller. The point B can be moved along the vertical line changing mostly but not only the size of the roller. The vertical line can be moved left and right and defines the centre diameter of the raceways. The resulting three dimensions of the roller and the two angles for the raceways can be shown by using the measuring feature of sketchometry.