Cnc youtube

http://www.youtube.com/watch?v=20jIxK8LoR8 24 bearings per side, 6min

http://www.youtube.com/watch?v=g3L55ZD4rpI Based on  www.dillingercnc.com,  square tube with bearings top and bottom, clamped by threaded rod.

http://www.youtube.com/watch?v=nR0o2I4qxAQ based off geeksgone bad design with v-bearings


 * http://www.youtube.com/watch?v=PdnQN6PwX8k Bearings design, based on desing by http://www.cncrouterparts.com/linear-carriage-with-abec-7-bearings-p-33.html tandard Linear Carriage, complete with bearings and hardware! Our premium linear motion system now comes standard with ABEC 7 Bearings. This carriage is designed to run on 1/4" cold rolled (1018) steel -- just purchase steel that overhangs your extrusion by 1/2", and you can build your own precision linear axis. We recommend Online Metals for your small quantity orders:  $24
 * http://thunderdork.com/diy-cnc-router-homemade-linear-bearings/