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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1. Something doesn’t have to be harder than steel to damage the blade over enough repeated impacts. Remember, your hair can dull a razor, and water can wear through solid rock. Given how fast the mower blades spin, you’re racking up millions of grass-blade impacts pretty quickly, and each one is a high-speed smack.
2. Even with very careful use, the blade is getting hit with some things that ARE harder than steel. Sure you’re not hitting big rocks, but “dust” is also rocks, just very small ones. So as you mow, the sharp blade is constantly flying through a cloud of tiny rocks, which make tiny scratches that add up.
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