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Discussion in 'Knives' started by epicelite, Jun 28, 2010.
Can it be done? :|
It can be done, but I don't believe it can be done by hand, as lawnmower blades are not sharpened like knives....
Why not? It's just a chisel ground blade. Remove it from mower, then use benchstone, belt sander, angle grinder (with sanding disk!), or whatever you have put an edge on it. Use an obtuse angle, the blade is too soft to hold anything less than 40°.
Alternatively you can flip the mower over and use a lansky puck or any other stone to sharpen it.
We've always sharpened the things on bench grinders at my house. They don't have to be razors, you just want to get the chips out and get them kind of 'axe' sharp. Follow the original blade angle, and alternate sides to avoid overheating (they can take a bit of heat but you don't want them to start turning colors). When you're done use a screwdriver to make sure it's balanced, if it isn't take a bit more metal away from the heavier side.
I recall a good demo being shown in the movie "Sling Blade" Plenty of other EDC tips too.
I seem to remember when I had a lawn it was just as easy to buy a new blade. They were fairly cheap! But if you decide to try it I wish you the best of luck, which I never had much of when it came to lawn mowers!
Although I do think a belt sander would do a better job, so if you have neither piece of equipment and want to invest in something I would go with a belt sander. Plus, you can use it for knives. Definitely on my long list of things to buy.
I don't think sharpening by hand is worth it unless you have a really coarse diamond stone, in which case it could work. Sharpening would probably not be too hard, but getting the chips and dents out would be a real .
Use a bench grinder. I get several shaprenings out of a set and at $60 for my blades you can bet if I could get more I would.
I sharpen mower blades all the time. I use an angle grinder, but a bench grinder does a great job. The trick is to make sure it's balanced (same weight on either side of the center) because unbalanced blades will create a vibration that will harm bearings. You can buy a cheap balance for under five buck, and it's well worth the money.
Apparently you have never seen the movie Slingblade.
Yes it can be done. Disconnect the spark plug so the mower can't start, remove the blade, either use a vice and mill file (actually, they're called mill bastards, but the board may block that word for illegitimate child) or a grinder of some sort (belt sander will work fine).
ideally, the blade should be mostly balanced - check this by locking a ball-pein hammer in the vice with the ball upwards, place center hole of blade on ball and see if it balances - if not remove small amounts of material from heavy (lower) end.
Reattach blade, reconnect sparkplug, enjoy a sharp blade.
Well, sharpening the old blade is cheaper then buying a new one, rite? :3
I have a reel mower and I touch up the blades with my dremel in just a few minutes. It works fine and I also us it to touch up my shears. The dremel is a lighter use tool so it is best to touch things up every month or so, so it doesn't have to work too hard. I find a beer helps too!
I use this on my Dremel and it gets my blade really sharp:
I use a flat file
I sharpen mower blades with a Dremel while the blade is in a bench vise. Dull blades damage the grass. You should only be taking off a very little metal at eah pass. It takes longer to remove and reinstall the blades than it does to sharpen them.
I support the blade solidly (a vise works best), then follow the original angle first with a double cut mill file then a single cut mill file. I have sharpened them on a bench grinder but always end up removing more metal that way and the blade is no sharper than when filed. The blades for my mower are not cheap so I try to get as much use as possible from them. Sharpening them with a file works best for me.
Biscuts and mustard mmmmmmhmmm
That's how I've sharpened mine for many years.
I have seen it done quite a few times. That was done with a file to remove any nicks or damage in the blade and bring it back to fairly sharp - remembering it doesn't really need to be razor sharp to cut grass when it is spinning at that speed.
A fairly simple job versus paying for new blades, I know what I will choose