What is this for?
With that worm drive, it won't be cranking anything very fast, I'm thinking maybe a winch of some kind?
Im guessing here. It may be a winch to raise or lower the table on a KR Wilson Hydraulic Press or something similar. I have seen the big massive 50 to 100 ton hydraulic presses listed on e-bay. It would take something like this to adjust the table.