I have two small children that love to visit me in my workshop. My worry
has always been that one day they may visit the shop when I'm not there
and
some how turn on a machine and feed their hands in. Right now I keep the
door locked and ALWAYS unplug the machines.

I want to add another level of safety by putting onoff / key switch
controllers on all the machines but mounted on the wall well out of the
reach of any child.

Has anyone done something like this and if so where is a good place to
purchase the equipment.

Now, I've read all the replies to this post and the one thing that no one
brought up is the same way my father kept me safe in the shop when I was,
shall we say "short"?...

FEAR

Now, my father never once beat me...a spanking or three on occasion, but
never anything worse than that, but I was not in fear of my father, but in
fear of his disappointment in me for doing something that he told me not to.

I am the youngest of 4 kids and dad NEVER locked his machines and never
needed to...we knew better. And it worked for the next generation, too...I
never locked or hid anything from my step-son...he believed me when I told
him that very bad things would happen...if not from the tools, then from me.

Neither of us needed therapy to "recover" from being raised with a firm
hand. Oh, and my step-son actually did better than me...I never had to
punish him for anything shop related.

I'll get off my soap-box now and have a beer.

Mike