Quote:
Originally Posted by Tyler2517
You could try using a set up like 1640 uses for their swerve drive. It can support huge amounts of weight and take a good hit. Its also pretty compact. Just mount it upside down? It uses a thrust bearing to handle the axial loads and a very large bearing to handle radial loads.
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We use a 1" 6061 Al 1/4" wall tube for our swerve pivot with two sets of bearings 1.75" apart. The bottom (main load) bearings consist of a 1" flanged ball bearing race (McMaster 6384K373) to manage radial loads and a 1-1/2" thrust bearing (McMaster 6655K25) for axial load. At the top, we use an 1-1/4" Igus bushing with a bronze sleeve around the 1" Al tube (because of aluminum's softness and tendency to gall).
These handle competition loads really well (we have had no service needed to our original 4 pivots during the entire competition season comprising 70 matches overall), but the diameters are a lot smaller than what you were looking for in your original posting.
BOM's and CAD files are available:
http://wiki.team1640.com/index.php?title=Swerve_Central