People seem to call them "Bridgeport gearbox power feed". Mine has one as well. Mine works, mostly. There are a couple of gears that sometimes slip, I avoid those. I used to have an exploded view, but I can't find it. Hate it when that happens. I think mine might be leaking in the same place, but it's very slow, a drop a month or so. When I cleaned up the mill, I pulled it off and changed the oil, it was pretty gross.
I looked into fixing it up, but parts are almost non-existent and complete units are hard to find, also might have the same sorts of issues. I decided that since the oil on the machine itself is a total loss setup, I'll just top off the feed unit once in a while.
If it decides to break down, I'll probably just buy a more modern unit. Other than the weight, it works fine and gets the job done.
That motor and gearbox will accelerate wear on your table but most likely , it's on an older BP to begin with .
