rotary mower blades

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.
 
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.
 
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.
 
Floor jack--butterfly impact wrench and air grinder and 24 or 36 grit disc, fifteen minute job.
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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
Blade sharpener jig
 
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.
 
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.
 
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
 
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.
 
> 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.
 
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.
 
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.
 
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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