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Re: "Cheap" Robot parts
Quote:
An alternative to ball bearings: Just use bronze bushing.
Before assembly, be careful to make sure the mating interface to the bushing is very clean to avoid friction. And of course add some oil.
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Actually bronze bushings should be all ready lubricatd. They cotain little pores of oil that come out when the shaft moves fast enough.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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any robot that can hold and transport its team has found its purpose and can be considered complete - Nitroxextreme [more] 
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