How Often To Sharpen Mower Blades

Today’s topic will be about a question I get asked a lot about: how often to sharpen mower blades? In fact, it’s really quite simple.

You can see a lot of blades that haven’t been sharpened for a whole time because people still use them to get all out of them. It isn’t really nothing wrong with that as long as the rest of the blade still in good shape. So how can you know that it’s time to sharpen your mower blades?

How Often To Sharpen Mower Blades


What usually happen is that your top fin, which acts like a fan to pull the blades of grass, starts thinning and chipping away. It’s still cutting alright but the problem is it starts chipping away and pieces of metal start flying out from your mower. It causes a safety hazard when they get on mowing process.

For example, I have the blades that are off a dixie chopper and we used them from mulching the leaves and stuffs as you’re ready to be changed out in the spring anyway. They get worn out bad into the top part of the fin, like you see on this you getting eaten away from the leaves, sticks and stuffs; and they happen after time and a lot of usage.

mower blades

Consider Your Mower Blades

If you take your blades off and your fins still thick, you’re not getting too far in from grinding if your blade gets weak. Having these conditions means you’re still good to go just to sharp them and put them back.

Just one normal wear and tear, but until it starts thinning out where you see cracks through, that’s when you want to take them off. Don’t try to weld them because you’re just making them brittle and the situation may be worse.

Sharpen The Blades

When you sharpen the blades, you don’t want to get the edge to the hop. Have you seen it start turning blue? You didn’t take the temper out of that. What will happen is that it will start chipping away but that didn’t even sharp indeed.

If this is the first time you sharpen your mower blades, you may not want its razor sharp. If you do it’ll be gone in a matter of minutes or hours, depending on how sharp you got.

Other Situations

The other time when you need to replace blades is when they’re bent too bad. Let it set flat, in this case you can just look at that and see it’s bent bad. Actually, the center bolt was loose and it apparently hit the deck.

That’s another good example of a blade that should be replaced: you see it start getting too thin and chipping away on the roof in there and just starting to develop a crack all the way through.

There are two different places where you won’t check usually on the blades. If your motor has blade adapters, you might want to check. Take this one off and it was broken. These are just made out of cast iron.

I put a new one on to new grade five bolts and it should cut better because it gets loose in 2/3 our blade eyeline and it can flex on there too. But the seizure start pattern here and you may want to inspect the straw on the bottom of the spindle or quill assembly.

Wrapping It Up

Now if you guys just keep on using this, it will not be safe because one of you do it at your own risk. I would recommend a replacement when it starts thinning out. It’s definitely time to get rid of it if you see cracks, just throw them out. That’s a few tips on when you should just sharpen or replace blades.

Read more: What To Do If Lawn Mower Starts Then Dies?