Technically a 2 day project I guess.
Overhauled the 1946 K&T 16" rotary table I was gifted the other week. It was extremely hard to turn so I disassembled it completely to find the cause.
So much oil and guck that I didn't end up with a lot of photos.
Even fully disassembled, neither turnplate or base casting can be rotated around without the crane, makes things very difficult.
The two piece screw assembly can be seen on the right, there's an adjustment collar/nut that adjusts both bearing preload and wormdrive backlash at the same time, took me a while to realize how to set it when reassembling..
Most of it was in very good condition but unfortunately water seems to have gotten in on the "handle-side".
Roller bearing for the input shaft and an axial bearing for the screw shaft were both quite seized..
Managed to get the roller bearing working again after repeated flushing with WD-40 and manipulating it.
Have not managed to find a replacement for the axial bearing so I spent probably 2 hours wire brushing the rust off and manipulating the bearing balls to first snap them loose and secondly clean them up. Far from perfect but at it should work under low preload until I can find a replacement..
More rust on the teeth that's been closes to the worm where moisture has been.
Luckily fairly light so a good wire-brushing took this off.
Finally up and running! From almost completely seized to very easy to use. You can feel the pitted axial bearing if you rotate in one direction but it still rotates very nicely. Not bad for a 77 year old rotary table.
(Don't mind the super sketchy setup)