im having problems getting all the bearings to roll on the y axis.
is there a good method to allign the y axis pipes.
thanks for the help

When I built my JGRO I had the same problem. My solution was very low tech and a bit clumsy but it works. As long as the bearing is not too far from the pipe, loosen the bolt that holds the angle aluminium to the mdf and put a small spacer under the end of the Aluminium angle which holds the guilty bearing, once you get it touching tighten the bolt up a bit and check to see that the bearing is still touching the pipe.

Jason

thanks for the help