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you could anchor a semi drum flange to your floor the weld the stand to the drum.
I've tried that, and the only drums that are stable enough for heavy work are the HD truck drums --mid-sized or semi trucks. I also bolted the drums into the floor to be able to apply lateral torque on the vise. Worked well enough for many years. The good thing was that you had plenty of room around the vise stand, vs. a vise mounted in a workbench.
The problem I would have with not having the stand secured is many items I put into a vice involve stuck fasteners. Which often involvecheater barsI mean engineered torque multiplication devices, hammers, heat wrench, and bad words. Not having the vice mounted rock solid would only result in more bad words. Even with a semi brake drum I would think this would be a problem.
I've tried that, and the only drums that are stable enough for heavy work are the HD truck drums --mid-sized or semi trucks. I also bolted the drums into the floor to be able to apply lateral torque on the vise. Worked well enough for many years. The good thing was that you had plenty of room around the vise stand, vs. a vise mounted in a workbench.
Brake drum works well for bench grinders and such.... Never had a vice on one. I would guess as long as you don't have anything heavier than the drum in the vice you would be fine.