I have not done that much, but I am feeling proud. The chain hoist is now suspended beneath a 6x6"x8' wooden beam, lying on 5 joists, on a steel beam held by two 1/2" threaded rods that are under very equal tension. I feel that it can handle a ton, which is more than I need. Even if I ever buy something like a military surplus Onan DJC generator, it would be way under a ton.
The wooden beam has a slight arch-like bend in it, about 1 cm, which was reduced by tensioning to about 0.5 cm. The benefits of it are going to be better weight distribution and some minimal amount of cushioning in case the load drops a few cm for some reason.
Thanks to all for correctly pointing out dangerousness of my previous setup, and making helpful suggestions.
How much does a bridgeport mill weigh? ;-) our military base has a few for sale. :) Since I may soon have 3 phase gensets, I could try to buy one mill, maybe for resale.
i