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Tool Talk Discussion Forum

rotary mower blades

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dewy

07-15-2020 18:28:08




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whats yalls go to method for sharpening blades......thanks dewy




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Bob - MI

07-18-2020 06:40:19




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I have a couple of options. We use large pedestal belt grinders at the shop and that's generally what I use. At home depending on how dull they are I use a file while the blade is clamped in a vise.

Either way I always check the balance and work to get them as close as I can. I think that and using synthetic grease in the spindle bearings really goes a long way to increase bearing life. My Cub Cadet 2518 has 540 hours on it and still has the original bearings in the spindles.

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flembo

07-17-2020 05:55:49




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I do as others have said clamp them in a vice and use a 4-1/2" angle grinder, but I also check them with a cone shaped balancer made for blades and adjust if needed.



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fixerupper

07-16-2020 11:25:46




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I use an angle grinder but the sanding idea sounds interesting. I dont try to get them razor sharp. If I did the razor sharp edge would be there for only a few minutes of use anyway. How long the edge lasts depends if the grass is lush and tender or dry and tough.



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Azpeapicker

07-16-2020 06:19:44




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I noticed hat nothing was mentioned about balancing the blade which is just important as sharping .


Azpeapicker



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MarkB_MI

07-16-2020 08:49:57




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 Re: rotary mower blades in reply to Azpeapicker, 07-16-2020 06:19:44  
> I noticed hat nothing was mentioned about balancing the blade which is just important as sharping .

Good point. I always count the number of passes I make with my grinder, then make the exact same number on the other end of the blade. When I'm done, I'll check the balance by hanging it on a nail; it always seems to be close enough.



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Ken Loewenhagen

07-16-2020 04:54:42




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I've tried just about every method. The one I like best is a 4-1/2" grinder with a 80 grit flap wheel. No need to file. Really does an excellent job.



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John T

07-16-2020 04:29:52




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Dewy, I clamp mine in a vise and start the sharpening process using an angle grinder but not to drastic. Then I finish off using a hand file to smooth and finish them off. NOTE a man who has owned a lawn more sales and service 20 years told me NOT to over sharpen them down like you would say a pocket knife, just a nice clean smooth even edge NOT razor sharp. Works for me. After too many sharpenings when the outer edge starts to round off too much I replace them

John T

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RobCons

07-16-2020 04:19:31




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
If your talking about a bush hog I lift it with tractor, brace it up, and use a 4 1/2 inch grinder to put an edge on them. A lawn mower I take them off and use the grinder on them while clamped in a vise.



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MarkB_MI

07-16-2020 03:14:35




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I keep a spare set of sharpened blades for my ZTR so I can swap them out quickly whenever I need to. Then when I have time, I sharpen the dull blades with a 4-1/2 inch angle grinder. I do it outside with the blade clamped to a sawhorse to keep the dust out of my shop.



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Dean

07-15-2020 20:06:01




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
File.

Takes awhile and I go through a file each time.

Dean



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oldproudvet

07-15-2020 19:49:04




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Here's a jig I purchased a couple of years ago. Really, really slick. A well thought out fixture that holds the blade and grinder on a constant angle. I got away from the grinding wheel on the 4.5" angle grinder, and the blade in the vise and I'll never go back. Once I trued the blades with a grinder, lots of metal to move, I finish with a 40 grit abrasive disc. Amazing finish. I touch up my blades every 20 hours of mowing and it's a piece of cake with abrasive. It'll save a lot of blades. Take a look.... Local, American made in the Midwest. Larry

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gab

07-15-2020 19:25:13




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Floor jack--butterfly impact wrench and air grinder and 24 or 36 grit disc, fifteen minute job.

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Stephen Newell

07-15-2020 19:48:14




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 Re: rotary mower blades in reply to gab, 07-15-2020 19:25:13  
I normally use a grinder and then finish with a file.



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gears

07-15-2020 19:13:08




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
I prefer the remove & sand method with a 4&1/2 grinder and 60-80 grit disc.

I can get the edge back and not remove so much metal that it needs rebalanced. I feel like it doesnt get as hot as a grinder either.



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mf294-4

07-15-2020 18:55:13




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Take the blades off. Put in vise and big angle grinder. Rotate the blades when I put back on.



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Guido

07-15-2020 18:44:32




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Hello dewy,

Yall gone a laugh at this: 4/1/2 in. grinder with 40 grit sanding disks. Put the blades in a vise 5 minutes job for me. Two riding mower blades,

Guido.



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moonlite37

07-15-2020 18:38:52




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 Re: rotary mower blades in reply to dewy, 07-15-2020 18:28:08  
Take them off put in a vise and get s heavy angle head grinder. I know some sharpen on the machine, but i never do too dangerous and too hard to do.



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