The worm shaft is most likely binding on the ''thrust bearing'', if you can call it that. Mine was just a wave washer. I put real thrust bearing in mine, but just greasing things may be a big help in your case.
Have a Grizzly rotary table that gets light use (maybe once or twice a week for a really small operation) that is a couple years old. Others usually use it and when I used it recently it had lots of slop in the worm so moved it so it was tighter. Then when rotating it initially moved smoothly but then started binding up. I find it hard to believe it has gotten chips or other crud into the gears but perhaps possible. What should I be checking, looking at or doing? Is this going to need to be opened up and regreased occasionally?
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The worm shaft is most likely binding on the ''thrust bearing'', if you can call it that. Mine was just a wave washer. I put real thrust bearing in mine, but just greasing things may be a big help in your case.
Jim Dawson
Sandy, Oregon, USA