At my school, one of the teachers had fixed a spring to each chuck key, to make it impossible to leave in by mistake - you had to press the key in to open/close the chuck, and as soon as you stopped pressing it in the spring would make the key pop out. I'd have thought such a simple way of improving safety would be pretty standard by now, but I've not seen it since, at least on any of the home tools I've used.
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Really? I think every drill press I've operated has had that kind of chuck key. It's fantastic.
I've only used a small number of low budget tools on a very infrequent basis since. A quick search on the internet suggests that safety mechanisms are common nowadays, with keyless chucks and chuck guards seemingly the most common. I guess I was just impressed with both the improvisational nature and retrofitting of the spring solution.
I'll agree with that, I haven't seen someone retrofit their own before.