In the ultimate showdown between a lawn mower blade vs. a rock, the rock will always win.
Sometimes you can't see them coming. But when you hear that quick grinding sound underneath the mower deck, chances are you just ran over a rock and damaged your blades.
Dents and chips on the edge of the mower blade indicate damage from rocks or stones. This will quickly dull your blade and ruin the quality of cut for your lawn mower.
The sharp edges of the blade will contact a single rock multiple times as it spins around, even if you're cruising at a higher speed. So don't think quickly running over a small rock will prevent any damage to your blade. Stop, pick up the rock, or mow around it.
If you think your mower blades are indestructible, you'll change your mind after you remove a bent blade from under your deck.
Commercial mowers have to be a little bit more careful, since they mow in fields where the ground is a little more treacherous than an average residential lawn.
Mower blades are not the only parts that can be damaged by running over rocks with your mower deck? Check out our article on Spindles vs. Rocks!