I found some ABEC-7 (best accuracy) bearings that are originally for skateboards. They are about $1/each. See the web link below. I plan to use these bearings to build my own bearings & sliding rails. It has a 3.25 KGF dynamic load. My question is what is the load ratings in LBS (US pounds)? Can these bearings handle a 5' x 5' metal mill used to cut steel and aluminum? How do they compare with bearings normally used for metal CNC mills?
http://www.vxb.com/page/bearings/PRO...57e70856323141