The switch for powering up the spindle was connected from the same power supply as the stepper motor driver boards.

In order to operate my machine, it was necessary to have the power supply available to both.

Sometimes, I felt a bit apprehensive while I was changing the tool bit. At that time, I would be engaging the slots on the shaft and arbor of the spindle with spanners.  I could not imagine what would happen if someone in the same room were to flick the switch and the spindle turned. It would be rotating at speeds of 6000 rpm. Things would fly.

As a safety precaution, I decided that I needed a lock out system. Something that would prevent the above from happening.

safety cover lock out switch

safety cover lock out switch

I searched in my work cupboard and found a stainless steel cleat used for closing some sort of doors, modified it and then fixed it to the switch.

What I had done was to cover the switch handle so that nobody can accidentally touch it and flip it to switch on. If ever they have to switch on the power, they will have to lift up the cover and only then could they flip the switch.

safety switch cover

safety switch cover