dolly help

A skate wheel is just a preformed rubbery plastic. You insert two bearings into it, one from either side. The plastic is notched so they each fit perfectly into it from either side.

The hole within the bearings fits perfectly to a 5/16" bolt. So you simply slip the bearings/wheel assemblies through a 5/16" bolt (carriage bolt or hex type), then fasten it in place with a washer and a locknut (nylon insert). You can also use spacers or grommets as needed.

I built dolly that was attached to a deck bracket that had 1/2" holes. I found that it worked better by using a rubber grommet within the 1/2" hole. (A grommet is just a little rubber thing that keeps metal from touching metal. Look at any appliance with an electric cord coming out of it. That little rubber thing keeping the cord from actually contacting the plastic/metal/etc., that's what I mean.)

So really anything you can screw a 5/16" bolt onto or through, to use it as an axle, that's how you attach the wheels. The rest is entirely up to your imagination.

Also when shopping for wheels, note that a lot of manufacturers also make wheels specifically intended for "industrial use", usually plenty good quality and a LOT cheaper than wheels with flames and other showy graphics on them.

As for bearings, get the cheapest possible. Tests have been done for pro skater competitions, and really there's no noticeable statistical difference in performance for cheap bearings vs. top of the line. And it certainly won't matter for a camera dolly!
 
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