#1 and #2 rules of machining, whether a beginner or an old hack... Never allow anyone in your work area. And No loose long hair, loose clothing, jewelry of any kind (particularly rings), and keep your tools on the bench not on the machine. I worked at a shop way back in the 60's and the company had one of those bring your kids to work days. One old guy brought his Granddaughter (about 9 or 10 years old) had hair down to her waist. She got to wondering around and somehow her hair got caught in one of the machines work. The SWARF caught her hair and wrapped it around the running work and pulled her into the machine. Ripped her scalp all most completely off. I don't think places even do that any more. But brings up another rule, whenever possible grind or use a bit with a chip-breaker... and never wear gloves while machining either. May seem like fun to see who or how long a continuous string of SWARF you can make, but its a waste, hard on the bits, and dangerous.
Phil
