Best way to sharpen blades on rotary cutter: Field Mowers Brush Cutters  -- Tractor Attachments Implements 3ph Discussion Forum and Review Best way to sharpen blades on rotary cutter: Field Mowers Brush Cutters -- Tractor Attachments Implements 3ph Discussion Forum

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 05-18-2002, 07:23 Post: 38749
Redmessage
2002-05-18 07:23:45
Post: 38749
 Best way to sharpen blades on rotary cutter

I know this may be a simple question, but what is the best way to sharpen the blades on my 5' rotary cutter? I would prefer to not have to remove the blade and sharpen while attached. But do you use a grinder disk on a drill or what? What type of grinder disk? The pasture I have to mow is just medium density grass, no saplings or small trees. Thanks in advance.

Redman






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 05-18-2002, 16:21 Post: 38764
dsg

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 Best way to sharpen blades on rotary cutter

Redman,

I use a 4" handheld ele. grinder. I don't really sharpen the blades I just dress them up a bit, flaten out the dings but trying to keep about an 1/8" blunt edge.

David






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 05-19-2002, 05:45 Post: 38775
TomG

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 Best way to sharpen blades on rotary cutter

I keep something of an edge on my riding mower blades but I do it with a big mill-file. Well, the mower still cuts OK and I sharpened the blades about three years ago.

For a rotary cutter that's intended to cut material heavier than grass, I wouldn't want a very sharp cutting bevel. Thin edged blades mash up, or chunks break off, when they hit something woody.

I use a file because I really don't know if these blades are made of mild steel. Mild steel grinds OK on a high-speed wheel, but high-speed grinders generate heat and take the temper out of tempered edges. Quite a few decent wood chisels are rendered pretty useless by box store grinders.







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 05-19-2002, 08:45 Post: 38783
John Mc



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 Best way to sharpen blades on rotary cutter

I use a 4" (4.5" ??) angle grinder on my brush mower and do it right on the mower. The grinder was a cheapie, $25 or so. Works great... the only problem I have is figuring out how to direct the grinding sparks so I don't fry myself (heavy gloves and an old Carhart jacket help). I can usually figure out something with pieces of old 2x4 to keep the blades from pivoting while I try to grind them.

I do NOT use a fine grit wheel, since this tends to generate more heat. Take it slow, let things cool as you go.

I try to take off the same amount of each blade to maintain balance, but after a couple of resharpenings I usually pull the blades off and grind to match the weight and balance point of the blades.






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 05-20-2002, 17:04 Post: 38838
David Carpenter



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 Best way to sharpen blades on rotary cutter

I have a 5' Bush Hog and use a 4.5 angle grinder also, works fine. I use quick clamps, clamped to the back of the cutter to keep the blade from moving. Safety goggles are a must, along with gloves and a jacket. I have found that the blades on the Bush Hog hold their edge much better than the generic cutter I had before.






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