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