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Sharpening mower blades

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Dick

05-14-2003 18:28:40




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Advice on how to sharpen mower blades? Bench grinder - sidewinder - by file?Also what angle should the bevel be?

Thanks for any and all help.




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Scott Green

05-17-2003 01:53:01




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
I use a belt sander.



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Nolan

05-15-2003 03:11:49




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
Any of the methods you describe will work. This isn't like trying to sharpen a pocket knife, you don't need true sharp edge or such.

I personally tend to use my little 4.5" grinder because it's quick and easy. Lots of folks use a bench grinder because it's also easy and tends to produce a flatter cutting edge. Bench grinder is also what most mower shops use for sharpening a blade.

Things like stones in a drill or a Dremel tool are slow, as is a hand file. Though these methods are perfectly fine.

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John

05-15-2003 00:59:19




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
Buy a Dremel tool. They make an attachment kit for about $10 that includes a V-guide that sets the angle and a special drelel grinding wheel. These things work great, I can grind a nice edge, in some caes without even removing the blade!



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C

05-14-2003 20:08:06




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
In addidtion to all the other replies...
It is my understanding that you should leave a 1/64" flat (.015") on the cutting edge, not sharpen to a sharp edge. A sharp edge immediately rolls over anyway. This way you also save a little grinding (and blade) by not bringing it to a sharp edge everytime.



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Glenn(WV)

05-14-2003 19:59:51




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
Lowe's sells a grinding wheel specifically made for sharpening lawnmower blades. It's about 2-3" in diameter and has a 30-degree bevel in it, perfect for sharpening blades. It chucks in an electric drill. I have just such a wheel, and it works great! I think it cost about $12 or so.



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Brian G. NY

05-14-2003 19:11:48




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
If you sharpen them regularly and you don't try to cut a lot of stone, filing is all that's necessary. I clamp my blades in a vise and file with a coarse file; then a fine file. about 30 deg. as John says. Ocassionally, when I have hit a stone and the blade has a knick, I will grind it, but I always finish with a file to keep a nice straight cutting edge. There are special grinders that will do a nice job, but they're meant for the professional and are just too expensive for the average guy.

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John in MA

05-14-2003 18:51:17




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 Re: Sharpening mower blades in reply to Dick, 05-14-2003 18:28:40  
About 30 degrees, IIRC. I clamp the blade in a vise and use an angle grinder, then sometimes touch up with a file. Remember to balance when you're done.



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Brian G. NY

05-15-2003 19:42:13




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 Re: Re: Sharpening mower blades in reply to John in MA, 05-14-2003 18:51:17  
I sharpened the blades on my Lawn tractor today and altho I usually use a file, I tried something different; I used the flat side of my 6" grinding wheel. This worked real well and I was able to get a nice straight cutting edge. Of course..... I just had to "dress" 'em up a little with my fine flat file; not easy to give up old habits!



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