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Re: 80/20 linear motion?
Our team uses 28mm extrusion, and instead of using any form of linear bearing we have always used a special delrin slider attachment which fits into the extrusion and acts as a linear bearing (as delrin is self-lubing). the advantage of this is that there are no moving parts really like in bearing, and it gives a more solid connection the more the delrin and aluminium overlap.
please excuse lack of pics. can`t find my CAD files.
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To design a good mechanical system, you have to design something so simple it almost doesn't work, then increase the complexity until it does.
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