How do you sharpen lawn mower blade?

[William]

I sharpen my lawn mower blade, after each use.  I've tried using

• angle grinder
• die grinder
• rotary tool
• file

and found that die grinder is just the right tool for the job.  Problem is, grinding bits set that I bought from Canadian Tire, Rona, and Home Depot are all off-axis and wobble as it turns. (Ridiculous!)  Except for one bit.  I've been using it so much, that I now need replacement.

I don't feel like going hunting for that right bit again.  YouTube doesn't say anything I don't know already.  Maybe, I'm doing it all wrong.  So, I'm wondering

    How do you sharpen your lawn mower blade?

[ssfc72]

I just use a good file to sharpen the blade, unless the blade is very dull or has dents in the cutting edge.
If the blade has dings, then I use a bench grinder.

[Jason]

Very, very carefully...

[William]

I bought "flap disc" from Dollar store and will let you know how it goes soon.  Sometimes, you can find pretty good deals at Dollar stores!

[Jason]

We rent. I know nothing about lawnmowers or blades. One of the benefits of not owning a house.

[William]

I bought "flap disc" from Dollar store and will let you know how it goes soon.  Sometimes, you can find pretty good deals at Dollar stores!

I mowed the lawn today, and used this flap disc to sharpen the blade.  Yes, "flap disc" is the best way.

[ssfc72]

Thanks for the update William.

Do you use an electric hand drill with the flap disc?

[William]

This $5 flap disc is for angle grinder.  It's cheap, so only the edge makes contact.  More expensive ones have slightly angled sand paper, so you can make more contact.  I guess, I could use sand paper bit for die grinder, if I can find one.

[ssfc72]

Oh, ok I know the style of flap disc you are using, now. The flap disc doesn't have a shaft, but a hole to mount on an angle grinder. :-)