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Just some basic tips...
1. DO NOT USE SET SCREWS!!!! (as ajlapp and wysiswyg said)
2. If you use a chain drive don't foget the chain gurds. you wouldn't want your bot to just sit there and spin in a circle do you.
3. Again if you use chain drive the chain will loosen as it wears in. Use a peice of solid delrin shaft with an off center hole so as the chain loosens all you have to do is loosen the screw on the shaft give it a turn and tighten it down. This will pickup the slack in the chain and keep it tight.
4. If you burn or cut lines or nubs on the rubber wheels for traction make a few extra sets. From what I have seen it may help with traction a bit, but once you start pushing something and your wheels start to spin they will wear down really fast.
5. Don't overcomplicate it. (KISS) You don't want to spend most of you build time on the drive system. (what good is you bot if all it can do is move around on the floor?)
6. My favorite tip of all to remember DON'T USE SET SCREWS!!!
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Jay
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