Say you’re a lawn mowing professional or just your regular average ol homeowner, but you’re extremely careful and never hit rocks or damage the blade in any way. The mower blades still get dull, with only blades of grass and grass is not a hard substance. How does something soft like grass, dull a lawn mower blade?
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I own a professional lawn care business. We cut more lawns in one day than the average homeowner does in one year. Depending on the lawn density we may have to sharpen them more that EVERY week. If the lawns are wet then we will need to sharpen them before the next day.
The blades on our equipment spin at 350ft per second (240mph). Just like your hand smacking water at that speed it hurts. So the blades hitting the thick wet grass at the speed will dull the edge of the blades especially when wet.
Water running over granite in time will erode that stone.
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