I sure this has been covered but I can't find it with the search function,

Anyone have suggestions on how to align the pipes on the jgro machine? I have been trying quite a bit and keep having one or more bearings not touching. I believe the pipes are strait, but I am planning on taking them out and double-checking.

Suggestions would be greatly appreciated.

I have not worked on the jgro machine but have worked on similar alignment issues with other home-builds that use the same system.
With the adjustment bolts loose except for the bottom ones which have been adjusted for level...Use long clamps or wrap both rails together with rope on each side of the trucks and tighten so they load up the bearings. Tighten the pipe holding bolts incrementally while going from one to another. Keep checking for square and level.
It can be aggravating....

Look here: http://www.cnczone.com/forums/showthread.php?t=6054 post #93. I gave a short description of how I did it. Hope this helps.

jgro