To remove the blade on a radial arm saw, which sequence is correct?

• A. Disconnect the power, remove the guard, and turn the arbor nut in the direction of the blade
• B. Turn the arbor nut in the direction of the blade first, then disconnect power and remove the guard
• C. Unplug the saw, loosen the guard, and turn the arbor nut opposite the blade
• D. Disconnect the power, loosen the guard, and turn the arbor nut in the direction away from the blade

Answer: (B)

The main thing this question tests is understanding how the blade is secured and how to safely access it. The blade on many radial arm saws is held by an arbor nut that is often left-hand threaded, so it loosens when turned in the same direction as the blade spins. That means you start by turning the arbor nut in the direction the blade rotates to begin loosening it. Once the nut is loosened, you then unplug the saw to ensure there is no power, and remove the guard to expose the arbor so you can take the blade off safely. This order ensures the blade can be freed from the arbor without fighting against a tight nut, and that the power is off before you remove safety components.