how lawn mower blades start getting dull after only cutting grass.


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?

In: 92

In the same way that your beard dulls the blade of a razor.

The tip gets to a very sharp point, which makes it fairly brittle. Eventually it loses that edge and then it would be considered dull

Along with dulling from grass alone, I imagine the blade spinning agitates sand/gravel too (I “leaf blow” trails in my woods with the deck raised and I actually see an occasional spark from this when it’s getting dark).Throw in some acorns and there you have it

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.

Also, when you mow, your mower blades pick up a lot of sand, dirt, sticks, rocks, and other debris as well.

Grass is not entirely made of soft things. A few percent of it is silica that forms into little phytoliths. Silica is harder than steel, so the tiny bits of silica can dull the steel.