Recently, I purchased a horizontal mill. It looks like a Burke #4. These are simple mills, and I just opted for a shallow disassembly, cleaning and lube. I did not pull the tapered roller bearings, but just pushed a little grease in the ends. They seemed pretty well taken care of anyway. Put it back together, and it ran fine and cut fine. Acrylic plastic, pre-hardened alloy, all great! Just couldn't cut pockets, but that's for later. After a few cuts, a squeaking noise appeared. It kind of came and went. I was pretty sure that I had oiled every point. The Burke design doesn't have many places to oil. The machine was already well oiled. I like to oil a lot, since oil is nearly free. Anyway, squeaks are bad, so I disconnected the power feed. Still squeaked. Disconnected the spindle. No squeak. It is the spindle. Turns out that this was the overarm center that the arbor spins against. I had already oiled this, and oiled it twice more during operation. It appears that lubrication must be applied to the point. It will not get in to the friction area unless the overarm is taken off. Just dripping it doesn't work. There is probably a better lubricant, but I took it apart again and checked the point, and it was still well lubed after doing my project. It is easy to take off, and oil is nearly free, so I just have to remember. I have never burned up a dead center, but you can tell when a dead center needs more lubrication, and as long as you don't run too fast, you can always dribble a little more, and it will get in. Besides, oil is nearly free.
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