Operating Controls and Switches
Power tools must be fitted with safety switches; they are extremely hazardous when used improperly. The types of power tools are determined by their power source: electric, pneumatic, liquid fuel, hydraulic, and powder-actuated.
Power tools must be fitted with safety switches.
Constant-Pressure Switches and Controls
The following hand-held power tools must be equipped with a constant-pressure switch or control that shuts off the power when pressure is released:
- drills
- chain saws
- tappers
- belt sanders
- fastener drivers
Belt sanders must be equipped with a constant-pressure switch or control.
- horizontal, vertical, and angle grinders with wheels more than 2 inches (5.08 centimeters) in diameter
- disc sanders with discs greater than 2 inches (5.08 centimeters)
- reciprocating saws
- saber saws
- scroll saws, and jigsaws with blade shanks greater than 1/4-inch (0.63 centimeters) wide
- circular saws having a blade diameter greater than 2 inches (5.08 centimeters)
- percussion tools with no means of holding accessories securely
- other similar tools
These tools also may be equipped with a "lock-on" control, if it allows the worker to also shut off the control in a single motion using the same finger or fingers.
Knowledge Check Choose the best answer for the question.
2-3. Drills, belt sanders, and chain saws all have this safety feature in common.
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