https://www.reddit.com/r/OSHA/comments/andoe8/cutting_steel_in_school_on_a_chair/

This image was taken at a school – one man is using an angle grinder to cut something while the other man holds the piece on a chair for “support”.

Using an angle grinder can be extremely dangerous for several reasons. If the wheel isn’t the right size or type, or is defective, it could break apart and become a dangerous projectile. One that can take off a finger, put out an eye, or do serious and sometimes fatal damage.

One Reddit user commented on this post “Happened yesterday at work, co-worker of mine, “Jim” was using said grinder, kicked back, snagged his untucked shirt, then reeled in and sliced his lower stomach, 18 stitches later…”

The job requires a stable and supported area for the piece being grinded such as a table vice or clamp. Additionally, the men should be wearing hearing protection, safety glasses with side shields, and a face shield. Need proof? Just look at what can happen:

http://i.imgur.com/hc0qVrf.jpg