Yes. One of the ways to sharpen the mower blade is through the use of a power drill and a sharpening stone. Just power up and run the drill on the dull blade. Although there is no specific and defined period on how often the blades should be sharpened, however, if your usage is high, it is best to sharpen the blades every 3 to 4 weeks to maintain the sharpness. This will also reduce the chances of the blade getting dull.