Quick Answer
A properly tensioned saw blade will vibrate smoothly when running, with the saw plate remaining flat and the blade tracking true. If the blade vibrates unevenly or the saw plate becomes wavy, it's likely out of tension. Check the manufacturer's guidelines for specific tensioning specifications.
Checking Blade Tension
To check blade tension, start by turning off the saw and removing any debris from the blade and saw plate. For most saws, you’ll need to locate the tensioning lever or screw, which is usually located near the blade. Consult your owner’s manual or manufacturer’s website for specific instructions on finding and adjusting this component.
Measuring Blade Deflection
Proper blade tension can be measured by deflection, or how much the blade bends when subjected to a specific force. A commonly used method involves clamping a 1-pound weight to the blade, about 6 inches from the saw plate’s center. Measure the deflection, or bend, in the blade using a ruler or calipers. Compare this measurement to the manufacturer’s recommended deflection range for your specific saw blade. Most blades require a deflection of around 0.005 to 0.015 inches.
Adjusting Blade Tension
Once you’ve determined the current deflection and compared it to the recommended range, you can adjust the blade tension accordingly. Turn the tensioning lever or screw clockwise to increase tension, or counterclockwise to decrease it. Make small adjustments, re-measuring the deflection after each change, until you reach the desired tension. Always refer to the manufacturer’s guidelines for specific tensioning specifications, as some saws may have unique requirements.
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