I doubt that it took as long as two seconds to real him in. With a dead man switch and brake, no reaction time would be required. Once the machine started to grab, the switch would be released and the machine slammed to a halt.
My work has a 34 inch double chucking machine (two chucks, one on either side of the spindle and it has a 3 jaw on both sides) and we have a couple 9 feet vertical turret lathes (the chuck is 9 feet diameter) and they run a 3 jaw, its just application specific
At least that's the way to design it.
Most machines you need to be able to work with both hands at the same time, kind of like the pat your head and rub your stomach so a dead man switch is counter productive, besides I was at a stamp and die shop once and this huge 200 ton press had dead man switches arm lengths apart, both had to be pressed to activate the press and if one was released the press would raise, well the operator by some form of magic still managed to press off a hand even though both hands were required to press buttons to operate it. If lathes had dead man switches someone would tape the down or by pass them, not to mentions you usually can't stand in one spot at all times to hold a button down to make a machine run.
I suppose some sort of lock would be useful if the machine could work unattended.
Very few manual machines will work unattended, especially older machines, you have to engage and disengage feeds, I mean some machines have stops to set where a feed starts and stops but a manual machine is very much that.... very manual and hands on
A safety shield would be nice too.
Most manual machines you need see what is happening in every aspect of the part and tool so guards become cumbersome and in most cases make it more dangerous in my experiences, my small tooling lathe has a guard mounted on the tool post and more than once have I ran into it or something gets caught (mostly by stringers) and pulls the guard into the part.... I took it off after a large stringer grabbed it a pulled it into the chuck
I keep wondering why a chuck that size is only a three jaw instead of a six.
In the end it is situational awareness and not be complaisant that will save you, you can engineer and regulate all you want but mature, responsible, educated employees are the only ones that will stop stuff like this from happening. [/b]
edit: I don't know how to make the format correct but the parts in bold are my response