Habits come before gear
Protective equipment limits the damage when something goes wrong. Precautions are about keeping it from going wrong in the first place. Most power tool injuries trace back to a short list of causes: a tool that was still connected during a change, a missing guard, a workpiece that moved, rushing, distraction, or using the tool for something it was not built to do. These are habits, and habits can be built.
Know the tool
Read the manual before the first use, and again when you try a new technique. Tool manuals describe the safe way to hold the tool, what accessories fit, the correct guard setup and the limits, such as maximum bit size, blade diameter and duty cycle. Warning labels on the tool matter too. It is worth knowing the tool’s switch, its lock-off or lock-on features, the direction of rotation and how it behaves at start-up. Use the tool for the job it was designed for, not as a stand-in for another one.
Inspect before use. A few seconds of quick pre-use checks catch problems early:
- Is the cord or battery in good condition?
- Are the guards present and moving freely?
- Is the blade, bit or pad the right type, sharp, undamaged and securely installed?
- Do the switch and trigger operate properly?
- Are there loose parts, unusual noises or smells?
Take damaged tools out of service until they are repaired. A longer tool inspection routine can be scheduled separately, but the quick look happens every time.
Disconnect before you change anything
Changing a blade, bit or sanding pad, adjusting a fence, clearing a jam or cleaning a machine all put your hands near the cutting part. Accidental start-ups are a recognized cause of injury, and the fix is simple: unplug corded tools, or remove the battery from cordless tools, before making changes. Unplugging tools is the most basic form of lockout, and it takes seconds. For stationary machines, pull the plug or switch off at the disconnect and wait until the moving parts have stopped completely. Keeping the plug in sight, or pocketing the battery, makes sure nobody reconnects it.
When you plug in, make sure the switch is in the off position, and keep your hands clear of the cutting area.
Keep the guards on
Guards, riving knives, blade covers, dust hoods and spindle shields are designed into the tool for a reason. Removing or pinning back a guard to make a task easier takes away a protection that has a documented role in preventing serious injury. If a task seems to require removing a guard, look for a different method, a jig or a different tool. Check that guards return freely after each cut. Replace parts that are cracked, bent or sticking.
Secure the workpiece
A workpiece that moves is a common source of kickback, binding and slipped cuts. Hold the work with clamps, a vise or a stable bench instead of your hand when the tool is cutting, drilling or routing. Clamping systems and good workholding systems free both hands for the tool and keep your body away from the cutting path. Support long boards at both ends, so the offcut does not drop and pinch the blade. When drilling, a small piece of material can spin with the bit if it is not clamped.
Keep your hands away from the line of the cut, and remember where the blade will exit the material. Use push sticks and push blocks at a table saw to keep fingers away, and use the fence and the miter gauge as the manual instructs. Do not cut freehand on a table saw, since it needs a guide to keep the workpiece from twisting into the blade. For a circular saw, support the workpiece so that the offcut will fall free and the cut line does not close up and pinch the blade. On a miter saw, let the blade stop before lifting it from the cut, and keep hands clear of the blade path.
Start and finish the cut properly
Let the tool come to full speed before it touches the material, and let the tool do the work with steady, moderate pressure. Forcing it overloads the motor and increases the chance of binding. If the tool starts to bog down, ease off. Keep a firm grip with both hands where the design calls for it, and stand slightly to the side of the line of kickback instead of directly behind the tool. With a drill press, the table, the clamp and the speed all matter, and a spinning chuck key must never be left in the chuck. Releasing the trigger and waiting for rotation to stop before putting the tool down avoids spinning accessories touching surfaces or fingers. Some tools have an electronic brake that stops the blade quickly, but wait for it to stop completely regardless.
Mind the cord, the floor and the surroundings
Position the cord so it trails behind you and away from the blade. Check the power cord care points for nicks and heat damage. Keep the floor clear of sawdust, offcuts and clutter, and make sure there is a firm, level footing before the cut. Keep children, pets and bystanders out of the work area. Good lighting keeps you from misjudging the cut line, and a clean bench keeps the work in view.
Focus and condition
A tool with spinning parts does not leave much time to correct a mistake. Don’t use power tools when you are tired, rushed, distracted or affected by alcohol, drugs or medication that causes drowsiness. Take breaks, and stop if you notice that you are making errors. Hands that are cold, sweaty or numb from long vibration are harder to control. Wear close-fitting clothes, tie back hair and remove jewelry, which could be caught by moving parts. The usual protective equipment, like eye, ear and dust protection, still applies, and it is covered in the other articles in this group.
Shut down and put away
When you finish, switch off, wait for the tool to stop, disconnect it and store it safely. Remove batteries before storage in places children can reach. Clean up dust and chips, and keep blades covered or in their case. A tidy habit at the end of the job means the next job starts safely.
None of this removes risk entirely, and every tool has its own specifics. This is general information, so follow the instructions that came with your tools and consider training if you are new to a machine.