Originally Posted by MantisWorx
this is going to open up a big can but a few weeks ago i took a spur gear and cut rectangle windows in it (on a CNC of course!) and installed needle bearings instead of ball bearings and what i noticed is that you can actually run a fair amount of slip (if needed) and the dif rings do not get damaged as well as the heat is also a non factor! it worked very well. theoritically its all about surface area and a needle bearing has alot more of it so this means you can get away with only running three or four needle bearings and get the same surface area of a dozen ball bearings. i wish i could source out some ceramic rollers in .125 or 3mm diameter as it would be even better. one thing though is that your rings need to be perfectly flat to get the best results. i will post some pix later today
Ok, here's the first worm.
I can't see how this would work very well or last very long and here's why. The outer part of the needle has a longer distance to travel than the inner part. In order to get a needle to follow the circle of the diff ring, it has to slip across it's entire length. It wants to roll straight. A ball doesn't care what direction it rolls. You would have to use tapered roller bearings to make this idea work.