Quote Originally Posted by Nightshift View Post
Metalmuncher, those needle valve sight glass gravity drip oilers work great on old machines to keep bronze bushings properly oiled. You are gonna use pretty lightweight oil which will gravity flow down a very small tube.
I did that on my old 14 inch Rockford lathe. Found the bearings heated up a bit after a long run. Switched to 50 weight Mobil 1 synthetic and the bearings never ran warm after that. Did the same thing on my Bridgeport spindle bearings with 30 weight Mobil 1. Since these are total loss oiling systems, the detergents in the oil do not cause problems.