Machine tools injure people in predictable ways. These rules address the common ones. They are researched guidance, not a substitute for your machine's manual or formal training.
Rotating chucks and spindles
- No gloves near rotating work. A glove caught by a chuck pulls the hand in faster than you can react. Gloves are for handling stock and sharp swarf with the machine stopped.
- No loose sleeves, ties, jewelry, watches or loose long hair.
- Remove the chuck key every time. Never leave it in the chuck, even for a second. A thrown key is a projectile.
- Clear chips with a brush or hook with the spindle stopped, never with a hand or rag.
Eyes, face and ears
- ANSI Z87.1 safety glasses at every machine, every time.
- A face shield over glasses at the bench grinder and for heavy roughing.
- Hearing protection for grinders, bandsaws and angle grinders.
Drill press and mill
- Clamp the work or hold it in a vise. A drill that grabs spins unclamped work into a blade.
- Brass and bronze grab drills; dub the cutting lips flat.
Grinders
- Set the tool rest within 1/8 inch of the wheel and ring-test new wheels before mounting.
- Never grind aluminum on a wheel used for steel; it loads the wheel and can cause it to burst.
Materials
- Fine titanium and magnesium chips are a fire hazard.
- Leaded steel (12L14) and some brasses contain lead: do not weld or grind them without ventilation, and wash hands.
