Safety alert: sandpaper coils

[arftist]

This old greasey finger was shocked when I tool a sand paper cone mounted on a 1/4" arbor and stuck it in my electric die grinder.

Thank the Higher Power I had the variable speed unit set on very low speed. 

I had been using a carbide cutter to shape some stainless. 

I put the sanding set up in the machine.

It was already screwed on the arbor so I didn't notice it was upside down.

When I turned it on the cone exploded.

Completely cleaned and polished my Left hand fingernails on two fingers and wacked my safety glasses before I could drop it. Finger tips still sting a bit days later.

The big issue: this occured at just 7000 rpm. Had the machine been set at 27,000 I might be blind right now.

You can't be too careful.