I was looking at a post in the General Straight Razor Talk forum and someone suggested that 'The Dremel is the biggest danger invented for blades since rust.'
This got me to thinking what was the most dangerous tool I have ever had to use in my seventy years of making things. Without a doubt the most fearsome tool I have ever used would have to be an Arbortech Woodcarver. I don't know if it travels under the same name in the rest of the world but the Arbortech is essentially a circular, six toothed chainsaw blade that mounts onto the front of an angle grinder and is used for offhand carving. Turning at 10,000 rpm it cuts like merry hell (ie 1,000 cutting edges per second). What makes it so scarey is that the blade doesn't differentiate between wood knots and bones or soft pine and flesh.
My most chastening experience with it was when carving a big Victorian rocking horse body the cutter hit a knot, escaped from my grasp and swung in between my thighs. It cut a swathe through the leg of my jeans which lined up exactly with my femoral artery. Fortunately no blood was split but the cutter has never ever been used again.
Do you use a tool that fills you with dread?