Positive "On-Off", Constant Pressure, and "Lock-On" Controls
Some hand-held power tools must be equipped with either a positive "on-off" control switch, a constant pressure switch or a "lock-on" control:
This router has a constant pressure switch.
Power tools with this requirement include:
- disc sanders with discs 2 inches (5.08 centimeters) or less in diameter
- grinders with wheels 2 inches (5.08 centimeters) or less in diameter
- platen sanders, routers, planers, laminate trimmers, nibblers, shears, and scroll saws
- jigsaws, saber and scroll saws with blade shanks a nominal 1/4-inch (6.35 millimeters) or less in diameter
It is recommended that the constant-pressure control switch be regarded as the preferred device.
Knowledge Check Choose the best answer for the question.
3-5. With the hand-held power tools listed above what is the preferred safety device?
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