Eric Holmquist
03-04-2012, 4:04 PM
Just got this home-made articulated arm hollowing system to the point where I can try it out. Combined with basic design of the Elbo Tool with a Kobra base. Still have to make a Laser guide for it, but will fool around with it a bit first. Have the parts from Digi-Key to make my own Laser guide, but have had enough metal working for a few days.
Made my own boring bar, still need to make one of those adjustable tool holders that lets me mount the cutter at an angle.
Experimented with a different type of thrust bearing. Used Super-Oilite. They have much higher load capacity than the ball bearing type, and only cost around $0.60 apiece. They are sintered iron impregnated with oil. They can handle lots of pressure, but not much speed. Even if only rated for a few hundred RPM, moving the arm by hand, we don't get more than a few RPM out of the joints.
226157
Made my own boring bar, still need to make one of those adjustable tool holders that lets me mount the cutter at an angle.
Experimented with a different type of thrust bearing. Used Super-Oilite. They have much higher load capacity than the ball bearing type, and only cost around $0.60 apiece. They are sintered iron impregnated with oil. They can handle lots of pressure, but not much speed. Even if only rated for a few hundred RPM, moving the arm by hand, we don't get more than a few RPM out of the joints.
226157