I'm trying to build 2D Cartesian robot.=A0 I want to make it out of widely =
available, inexpensive parts.=A0 I've got the electronics mostly worked out=
, but now I'm down to building the actual frame for the system.=A0 I want t=
o use aluminum H channel extrusion for the rails because it is sturdy, chea=
p, and widely available (http://www.mcmaster.com/#4558t11/=3Ddx0ie).=A0 =


What I'm looking for is either a place to buy slide blocks or bearings for =
H channels or an idea on how to make them.=A0 I'd turn the "H" on it's side=
 so that it is an "I" channel, and I'd want the bearing to hold both sides =
of the middle of the I and the top of it, but leave the bottom free for mou=
nting holes/bolts.

So far the best idea I have uses three skateboard bearings per slide block,=
 one on the top and one in each side of the "I", and always use at least tw=
o slide blocks mounted on a rigid frame.=A0 I don't like this solution, and=
 I can't help thinking there must be a better way.

Thanks,
Brendan

-- =

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