This is a brushed dc servo on an old Milltronics Partner 3 knee mill. I thought the squeak was coming from the brushes, but the motor still squeaks when I rotate it by hand with the brushes removed. I'd like to tear into it further but I've heard the disassembly can be tricky. Any idea what would cause these things to squeak, and can I get an exploded view of the servo somewhere? I came across an exploded diagram years ago online but I haven't been able to find it again.
Rant & rave ..... A further complication is the screws used to hold the belt covers on .... Milltronics used those diabolical guaranteed-to-round-out button-head Allen screws, specially designed so that no wrench known to man can get a decent grip on the OD. I've never seen one of those things that didn't end up having to be drilled out, and these are no exception. They'll all get replaced with proper Allens.
Rant & rave ..... A further complication is the screws used to hold the belt covers on .... Milltronics used those diabolical guaranteed-to-round-out button-head Allen screws, specially designed so that no wrench known to man can get a decent grip on the OD. I've never seen one of those things that didn't end up having to be drilled out, and these are no exception. They'll all get replaced with proper Allens.