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Grinding brush hog blades

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Harry

08-13-2002 03:19:34




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I need to buy a grinder to sharpen brush hog blades that get pretty dinged up with rocks (large gouges, bent cutting edges, etc). The options are too confusing. Craftsman, Delta, Dewalt? Does it matter? Large wheel (10") or smaller wheel (8")? High speed (3600 rpm) or low speed (1720 rpm)? For rough work, should I get a wire wheel or just a coarse aluminum oxide wheel? I am a novice here and need some guidance. Thanks, Harry in Cooperstown, NY

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TimC

08-30-2002 14:26:32




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
He is another idea. Tourch off part of the blade and weld on the cutting part of a grader blade.

Works fine, last a long time.



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Fred OH

08-16-2002 13:32:18




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
I use both a pedestal grinder and a hand held angle grinder for myself and have got the scars to prove it...yep...got so confident that I had the hog raised up with the shop hoist...sharpening away and changing knees on the concrete and watching a car going by at the same time...scar is about an inch and a half long...required a few stitches, a shot and $159...nuf said. I read from a company that manufactures brush hogs that said to grind a 1/16" flat across the face of the cutting surface. Hmmm I never did that but didn't think razor sharp again.
My advise would be to use either method that is convenient to you...just be careful and not burn them purple with the grinder...that kinda takes the heat treatment out of the blade and makes it softer and easier to ding up. But if you do...don't worry about it cause a piece of plastic string will cut most of the green stuff. Your next question would be "what angle should I grind them at?" A short steep angle would be harder to ding up but won't cut as smooth and clean as a long thin angle. Seems that when you go to grind them and they're all dinged up...you have a tendency to steepen the angle to keep from grinding away so much of the blade...choice is yours...experiment around and find out what's best for you L8R....Fred OH

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Harry

08-19-2002 04:53:52




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 Re: Re: grinding brush hog blades in reply to Fred OH, 08-16-2002 13:32:18  
What a great set of responses to my question. I completely changed my mind based upon the advice offered. Saturday, I bought a Dewalt 4 1/2 " angle grinder, a heavy duty vice, and went to work. Not so hard after all. Had two sets of blades sharpened in less than 20 minutes.

Thanks all.

Harry



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JDTECH

08-13-2002 21:37:05




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
When my bush hog blades start to dull, I take them off and take them to the local blacksmith shop and have him heat them, beat them out and put an edge back on them for about 6-8 bucks a blade. You don't lose any metal by grinding and they hold an edge longer than if I grind them.



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Scott Green

08-13-2002 17:35:23




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
Well , here is how I sharpen my blades on my brush-hog. Lift it as high as possible. Get out the 4 or 4-1/2 inch grinder(I have both) , and go to it. About fifteen minutes later , you start mowing.



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Curt

08-13-2002 12:57:16




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
i like to stick blades in the bench vise and use the 4 1/2 inch milwalkie my dad found lightly singed in a burnt garage



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Mac

08-13-2002 09:01:04




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
4-1/2 Makita would be plenty. Remove blades as previously mentioned. I dont think you want to go the bench grinder route. Would take at least a 2X10 wheel to do any good. Who wants to wrestle the blades when you can let the vice hold them.
Try not let them get in real bad shape to start with. Good tips on previous posts.



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hay

08-13-2002 07:30:40




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
a 4" grinder is easiest to hold while under the "hog", however if you want to get a really good sharp blade with the proper angle it needs to be removed and clamped in a vise. much easier to sharpen while standing up looking at the blade instead of being underneath on your back with sparks flying all around. much safer also. if you do elect to sharpen underneath the "hog", please block it up so it cannot fall on you. be safe!

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Harry

08-13-2002 07:53:45




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 Re: Re: grinding brush hog blades in reply to hay, 08-13-2002 07:30:40  
Thanks for the help to date. I am thinking about a bench grinder not a hand held one. Safer all around. And should give a better finish to the blade (?). Any comments?



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kjm

08-13-2002 08:07:38




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 Re: Re: Re: grinding brush hog blades in reply to Harry, 08-13-2002 07:53:45  
Harry, You may need a bench grinder but for this job you need a hand held grinder and a vise. A 4 in will work,a 10 in will work better. [a wire brush is good to remove dirt and rust ect. but won`t sharpen your blades]



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Dr. Evil

08-13-2002 08:02:39




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 Re: Re: Re: grinding brush hog blades in reply to Harry, 08-13-2002 07:53:45  
Probably better off with the hand-held grinder. That's how I end up sharpening my lawn mower blades.



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Don LC

08-13-2002 10:11:47




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 Re: Re: Re: Re: grinding brush hog blades in reply to Dr. Evil, 08-13-2002 08:02:39  
You need a body grinder with a #36 grit sanding pad.....mine is a 8" air driven....lock the blades in a vice and have them sharp in no time.....



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Dr. Evil

08-13-2002 10:41:05




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 Re: Re: Re: Re: Re: grinding brush hog blades in reply to Don LC, 08-13-2002 10:11:47  
I've got a 4-1/2" Dewalt and a 7/9" 15A Black & Decker from back before the Dewalt days. I use depressed center wheels, Type #15 I think on both...Either one will sharpen anything I need. On bush hog blades with only a single cutting edge You have to make sure the individual blades are close in weight otherwise the cutter may vibrate, Very hard on bearings & seals. On lawn mower blades I balance them over a screwdriver centered on the mounting hole. Remember to remove as much of the stuck-on grass & ??? before you balance the blades.

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T_Bone

08-13-2002 13:28:57




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 Re: Re: Re: Re: Re: Re: grinding brush hog blades in reply to Dr. Evil, 08-13-2002 10:41:05  
Hi Harry,

I would use a bench grinder with the blade mounted in a cross vise. You can buy a adaquote cross vise for about $60 now. This would let you maintain the proper angle and keep the blade cooler while grinding as you can adjust the feed rate and depth and stop the blade and grinder vibration.

I've also made a adapter to fit my Makita 5" 10000rpm grinder so I can mount that to a drill press vise. I used a piece of 1/2" x 3/4" bar stock with two bolts.

T_Bone

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F14

08-13-2002 03:32:30




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 Re: grinding brush hog blades in reply to Harry, 08-13-2002 03:19:34  
I think you'll find the most all-around useful grinder is the 4-1/2 inch jobs, with grinding wheels, not paper disks. DeWalt, Makita, Milwaukee, Porter Cable, Bosch, all the usual names for good power tools make them, usually in the $100 neighborhood. Might take a while on something with as much meat as a bush hog blade, but you'll find 100 other uses for it around the place.



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