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Originally Posted by Elgin Clock
I'm sure the wheels are held at the manufacturing plant for them to some sort of trueness, but the higher RPM they spin the more you notice imperfections.
The wheels you are talking about were probably designed to go way slower than you are spinning them. How many wheelchairs do you know that have the front wheels spinning 20+mph? lol
Anyways, keeping that in mind, check your pillow block or whatever you are affixing it to your frame to. Make sure they are aligned right. One .050" difference in center lines of the block from the X axis will make your wheel wobble a heck of a lot at these high speeds.
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Yes as you said the wheel we are using is normally a drive wheel (from NPC robotics), but they aren't made for the speeds we are using them at! I used a dial indicator to check alignment on the wheel and motor shaft and it was pretty good. But, it is quite possible that it has gone out of true since then. We use VERY high tolerance engineering (i.e. 1" +- .25")
Maybe we should harness the vibration as a battery charging mechanism!