A simple method requiring minimal tools and mechanical ability, is presented for making a spherical air bearing. The air bearings are used for an exploration of precession. Results of test measurements are presented.
Billiard balls may be purchased for approximately $10 per ball. We prefer the cue balls without an internal magnet.
Polyester resin is also known as “Fiberglass resin” and is readily available in hardware, automotive, and craft supply stores. Bondo Fiberglass Repair Kits have been our material of choice. One quart costs approximately $12 and is sufficient for about four or five bearings.