I was poking around looking to buy a magnetic chuck for my recently acquired surface grinder and a web search turned up this article (which has little to do with my search for a mag chuck for my grinder):
The conventional logic is that magnetic chucks are to be used for low-force operations like surface grinding, but these magnetic chucks are clearly in a different class....perhaps more on the order of the big magnets used on cranes for handling scrap and other materials.
How many of you who work as "real" machinists use such a chuck in a milling environment? The concept sure could make work holding with complex parts easier.
I would almost tend to think that they would be unsafe (ie, sucking loose tooling etc from the workbench near the machine etc, but perhaps that is not realistic. I believe gaussian force drops off with the square of the distance, so perhaps it's not that big of a deal.