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post #1 of 64 Old 06-16-2019, 08:30 AM Thread Starter
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Question sharpening blades

Has anyone heard of sharpening mower blades with a flap disc/wheel on an angle grinder? I've heard and read that this is supposedly a common method.

If not, what do you use?
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post #2 of 64 Old 06-16-2019, 08:37 AM
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Re: sharpening blades

Thats what i use to sharpen mine. Although ive heard many people say they are too aggresive.
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post #3 of 64 Old 06-16-2019, 09:35 AM
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Re: sharpening blades

I use a grinding wheel on mine.

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post #4 of 64 Old 06-16-2019, 10:01 AM
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I have stones strategically placed in my lawn that keeps a nice serrated edge on my blades. Failing that I use a small angle grinder.
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post #5 of 64 Old 06-16-2019, 10:07 AM
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Re: sharpening blades

Quote:
Originally Posted by Cnc View Post
I have stones strategically placed in my lawn that keeps a nice serrated edge on my blades. Failing that I use a small angle grinder.
Glad I wasn't drinking coffee when I read this post, would've been all over the keyboard!

I use bench grinder and balance them after every sharpening.

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post #6 of 64 Old 06-16-2019, 10:20 AM
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Re: sharpening blades

Quote:
Originally Posted by Cnc View Post
I have stones strategically placed in my lawn that keeps a nice serrated edge on my blades. Failing that I use a small angle grinder.


I don't care who you are that's funny right there!

I'v been using an angle grinder since I started sharpening my own blades with a grinding disc unless they are still fairly sharp, then I use a flap-wheel. I don't have a ballancer so I put them on a piece of all-thread in my vise to get them close.

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post #7 of 64 Old 06-16-2019, 10:41 AM
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Re: sharpening blades

I only sharpen blades once a year if that--in my yard the sharp edge lasts about one mowing,or the first tree root or rock the blades hit...usually by the time I've sharpened the blades 3-4 times they are overdue for replacement,they get cracks or chunks busted out from the solid objects they have hit over the years..

Frankly I do not see all that much difference in how the grass looks when cut with freshly sharpened blades --I have felt the edges on blades after one mowing I sharpened and they are already blunt and rounded over..but my yard is far from a golf course ,its more like a collection of green weeds and clover and wild flowers that resemble a lawn once cut..


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post #8 of 64 Old 06-16-2019, 10:57 AM
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Re: sharpening blades

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Originally Posted by Tractor-Holic View Post
I only sharpen blades once a year if that--in my yard the sharp edge lasts about one mowing,or the first tree root or rock the blades hit...usually by the time I've sharpened the blades 3-4 times they are overdue for replacement,they get cracks or chunks busted out from the solid objects they have hit over the years..

Frankly I do not see all that much difference in how the grass looks when cut with freshly sharpened blades --I have felt the edges on blades after one mowing I sharpened and they are already blunt and rounded over..but my yard is far from a golf course ,its more like a collection of green weeds and clover and wild flowers that resemble a lawn once cut..
Ha ha same here. But I like it that way it keeps the honey bees happy and making honey. I do like to do my first 2 mowings before I sharpen the blades because I leave the grass seed before the first mowing. Then it's time for a good sharp blade cutting. After that whatever..........

Been driving Deeres since 1974, Dodges since 1984, and Davidsons since 2004. Love my wife and kids I'm a blessed man.

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post #9 of 64 Old 06-16-2019, 02:13 PM
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Re: sharpening blades

I used a bench grinder, but then made a setup similar to the commercial blade grinding units to keep a more consistent angle on the blades.
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post #10 of 64 Old 06-16-2019, 09:53 PM
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Bench grinder, keep the pressure light so as not to create too much heat.

It is fairly easy to keep the same pitch as what is already on the blade by just paying attention.

Try to grind about the same amount off of each side of blade if possible.

Don't get them super sharp. you want them to be about as sharp as a butter knife; otherwise they will roll over on you.
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post #11 of 64 Old 06-16-2019, 10:20 PM
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Quote:
Originally Posted by Tractor-Holic View Post
I only sharpen blades once a year if that--in my yard the sharp edge lasts about one mowing,or the first tree root or rock the blades hit...usually by the time I've sharpened the blades 3-4 times they are overdue for replacement,they get cracks or chunks busted out from the solid objects they have hit over the years..

Frankly I do not see all that much difference in how the grass looks when cut with freshly sharpened blades --I have felt the edges on blades after one mowing I sharpened and they are already blunt and rounded over..but my yard is far from a golf course ,its more like a collection of green weeds and clover and wild flowers that resemble a lawn once cut..
Same here, tons of rocks and rounded blades. Beat that grass with a club every mowing and it'll eventually give up and be too scared to grow.

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post #12 of 64 Old 06-16-2019, 10:29 PM
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Re: sharpening blades

All you guys sharpen your lawnmower blades? ? ? A helicopter doesn’t fly, it just beats the air into submission, my mower doesn’t ‘cut’ grass, it just beats it down. Doesn’t grow as fast that way, well, at least until the “Wonderful Wife” expresses dismay at the miserable appearance of the yard. And since she cooks so great, I will make sure she keeps on doing so, I make a big production of removing the blade(s) and sharpen on a grinder. Mamas happy for a long time, (and therefore her #1 oldtgeezer is happy) well, until we start getting shaggy looking grass again. If it wasn’t for that cooking advantage, I’d just let the mower keep ‘beating the grass down’.
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post #13 of 64 Old 06-16-2019, 10:52 PM
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Re: sharpening blades

I use my Bradley blade sharpener and finish up with the magnamatic blade balancer.

In the past:
Craftsman, MTD, Snapper, 1961 Ford 801 Powermaster, 1992 LB 4.5HP 580546, 2003 LB 10552 6.5HP Duraforce, IH Cub Cadet 105, 2001 Cub Cadet 2146 14HP Linamar 38" deck, love of my life (Sold 10 Dec 2011), 2007 Cub Cadet 2550 22HP Kohler Vtwin 50"deck (Sold 22 Aug 2018)
In use:
1994 JD LX178 sweet little mower, only 15HP, twin cyl, 38" deck, liquid cooled!
1998 JD 445 22HP Shaft driven wheels, shaft driven 60" deck, diff-lock, hydraulic lift, power steering, fuel & temp gauges, fuel injected, and liquid cooled! This machine has it all!
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post #14 of 64 Old 06-16-2019, 11:56 PM
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Re: sharpening blades

Since I found out that the condition of the lifting wings on the back of the blade is more important than the condition of the cutting edge, I no longer sharpen the blades.

If the lifting wings can't suck the grass up to where the mower blades can make contact, even a razor edge will not cut the grass. Most poor cuts are due to lack of lift.

A sharp edge only lasts until it contacts the grass. If you look at a new blade, the cutting edge is not sharp. Mower blades cut with velocity (close to 200 mph), not with a sharp edge. Witness weed whackers. The wire is 1/16" to 3/32" in diameter. There is no sharp edge, and yet they cut as cleanly as a freshly sharpened mower blade after a single mowing of the lawn.

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post #15 of 64 Old 06-17-2019, 12:05 AM
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Quote:
Originally Posted by TUDOR View Post
Since I found out that the condition of the lifting wings on the back of the blade is more important than the condition of the cutting edge, I no longer sharpen the blades.

If the lifting wings can't suck the grass up to where the mower blades can make contact, even a razor edge will not cut the grass. Most poor cuts are due to lack of lift.

A sharp edge only lasts until it contacts the grass. If you look at a new blade, the cutting edge is not sharp. Mower blades cut with velocity (close to 200 mph), not with a sharp edge. Witness weed whackers. The wire is 1/16" to 3/32" in diameter. There is no sharp edge, and yet they cut as cleanly as a freshly sharpened mower blade after a single mowing of the lawn.
There is a limit to the dullness though. My first mower would start eating the deck drive belt when the blades got too dull.

My XT3 got to cutting slow and leaving strips last year when I let the blades get too dull. I didnt know until this year not to knife edge the blades. I got more cuts out of my last sharpening by leaving the edge slightly dull.

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