Spiral Grooved Spinner Ball

grabcad

Modeled from a pretty cool spinner I recently acquired. This is a different kind of spinner, in that you don't hold it in your hand- you place it on a table and give it a good spin. It will take at least 3 minutes to spin down to a stop (by which time you've become hypnotized by the progressing spiral groove ;). This assembly is only a guess on my part, as far as the actual components involved, since I'm not going to break it to find out just what kind of VERY low friction bearing it uses.