The best thing to do on an ineffective lawnmower blade is to replace it.
Yes, well if it gets blunt... Why shouldn't you?
A lawn mower blade can be sharpened with a blade sharpner. Any major hardware store can do this for you. You remove the blade and clamp it to a flat surface. Then you use an angle grinder to sharpen the edge using the original angle as best you can. Safety glasses are always necessary as this is dangerous to your eyes.
I use my electric grinder with rough & smooth grinding wheels
To sharpen lawn mower blades, carefully unscrew the blades from the machine. Use a putty knife to scape off any residue. Then take a medium file and stroke the edge of the blade evenly.
On my Craftsman Lawn Mower, I have to raise the lawn mower or tilt it on it's side, and underneath where the blade is, there is a large drain plug. Take it off and catch the oil. This is a great time to clean the underside of your lawn mower and either sharpen or replace your blade.....Nothing cuts better than a sharp blade!
With a file.
Yes.
Yes, you sharpen both blades. Professional blade sharpeners refer to the set as a "clipper blade".
to sharpen (a knife or any blade) is "aiguiser" in French. To sharpen a pen is "tailler un crayon".
A razor strop is used to sharpen single blade razors, otherwise known as cut throat razors. The blade is passed against the strop multiple times to sharpen the blade.
You get another blade and blunten it