"Dave B" wrote in message
news
One our customers recently had an operator that left the chuck key in
the chuck and started the spindle.

They asked us to provide a solution and here is what it looks like.
We have installed 20 of them in the last few weeks.

Will not allow the spindle to start without the key in place and if
removed of course the spindle stops.

http://s32.photobucket.com/albums/d1...chuck_safe.jpg


Dave B
That's a very neat arrangement. I saw an idea years ago to hang the key on a
lever type microswitch connected to open the power leads if the key was not
present. Your idea would be more foolproof.

Don Young