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Tool Talk Discussion Forum

Brush Hog Blades need rebuilt

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Scott

07-21-2003 21:02:02




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Well, after some serious clearing, a big chunk of red granite, a chunk of steel, and a little dirt, some of the sharp edge is starting to resemble the back of the blade. I have a tig welder with stargon gas, and I did weld in a small area when I got the mower, and it seemed to work well. Can I do some re-building on these blades to bring the edge back up to a sharpenable face? The worst spot is on the tips of the blades where the rock got hit...about an inch wide, and probably 3/8" deep at the tip.

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Bill R

07-24-2003 00:14:38




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
I buy new blades now. It's just not worth the time, bother and risk. I've already spent too many hours straightening, facing, fixing grinding and balancing the darned things. I hope my spent time saves you some time. They're cheap, and it's just not worth it, for me. Got brush to cut.



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Farmer John

07-23-2003 11:38:23




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
Scott
Don't build yourself a gernade!!! If the blades cannot be sharpened, Replace them. I have seen to many accidents from guys trying to save a buck by welding bladed. Blades are not that expensive. Would you weld on you PUSHMOWER blades,,,of course not because you like your feet....



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TimC

07-23-2003 09:22:27




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
I didn't take time to read all the post so this might be a repeat. If you can find and old grader blade, cut it and weld it to the existing bush hog blade, touch it up and never worry about it again.



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John A

07-22-2003 20:33:55




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
Scott, I agree with the others,But take this 2 steps farther! #1 While there, replace the mounting bolts. Again cheap insurance. #2 If you are particulary hard on this shredder go ahead and "Hardface" the edge of new blade. Will extend the life of the blade. And if done right and you get a good sharp edge, it will virtually eliminate the need to shapen again.
It will strengthen the blade for it is almost impossible to pop the hardfaceing off.
My ol JD shredder has a set done this way. This shredder has eatten and spit out TREES that it shouldn't have been able to do . In addition to washtub size rocks,stumps & odd pipe sticking out of the ground. The blades have been on for 10 yrs.
Not very much hardfaceing has come off over the years. Anyway that my $.02. Don't skimp on the new bolts.
Hope this helps.
Good Luck,
John A.

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Jeff

07-23-2003 08:09:36




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 Re: Re: Brush Hog Blades need rebuilt in reply to John A, 07-22-2003 20:33:55  
How did you run the hardface?

Along the top of the blade edge, or?



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John A

07-23-2003 18:38:16




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 Re: Re: Re: Brush Hog Blades need rebuilt in reply to Jeff, 07-23-2003 08:09:36  
Jeff, I visited with a local welder about it. Then, when I bought them @ my welding supply co. visited with them also. I bought only a few rods so I looked at the box they came out of also. To do 2 blades it only took 4 or 5 rods.
I used a ol Monkey Wards 225amp cracker box welder, to do the job. I did the beveled cutting edge of the blade. Then dressed the blade to a more even finish.
Hope this helps,
Good Luck,
John A.

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Jerry/MT

07-22-2003 12:16:03




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
My opinion is that you should never, never, never repair a rotary cutter blade. In order to do it properly you would have to know the metalurgical properties of the metal, verify that there were no microscopic cracks in it and the perform a certified repair that took all those factors into account.Have you ever seen what a broken blade whirling around at 540 rpm can do? Why take the risk of hurting yourself or a loved one to save the $20 or so that a new blade costs? You might get by a time or two but I would never take that risk.

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Tom_NC

07-22-2003 20:23:11




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 Re: Re: Brush Hog Blades need rebuilt in reply to Jerry/MT, 07-22-2003 12:16:03  
The PTO is doing 540 RPM and if memory serves me correctly the actual blade RPM is even higher. A small piece of metal would be like a bullet. I have to agree with the others, buy a new blade.



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Scott

07-22-2003 15:16:32




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 Re: Re: Brush Hog Blades need rebuilt in reply to Jerry/MT, 07-22-2003 12:16:03  
Well, the way I figure it, I'll have, at the most, two pieces 1", and about 8 pieces the size of a small pop rivet flying arround if it fails. The blades are entact, not broke. I just don't want to grind that much off the blades to get them sharp. I figured a little fill in the deep points could make the job much easier, and probably cut better. Yes, I've seen what mower blades can do. The piece of steel I hit was 5/8" thick...clean cut. The granite wasn't just a stone either. Split off a 1 lb piece. Gotta dig that sucker out next weekend.

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moonlite

07-22-2003 10:31:36




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
It can be done with your tig welder and will be safe to use if you know what you are doing. If you are that much experienced i doubt that you would be asking in this forum. Also this is too time consuming and would exceed the price of new blades.



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Mac

07-22-2003 09:56:07




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
Seen a lot of decent repairs, but I never trusted them. Blades are not that expensive.



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Richard Fazio

07-22-2003 09:48:43




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
I agree I also had a blade come off and go through the hog. It looked like a torpedo hole. New blades are like $20.00 each. Get yourself some new ones.



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BB

07-22-2003 04:43:09




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
Blades are not expensive. I would put new ones on before I would try welding the old ones.



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Bus Driver

07-22-2003 04:30:41




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
In my experience, these blades should never be welded. Pro welders in my area will not weld a mower blade. It is too dangerous to change the structure of the metal. I had a blade- never welded or sharpened- that broke without warning. It went through the side of the mower housing- 11 gage steel- and traveled 40 feet more.



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hay

07-22-2003 03:19:16




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 Re: Brush Hog Blades need rebuilt in reply to Scott, 07-21-2003 21:02:02  
i have seen "farmers" take a totally unusable worn out completly bush hog blade and weld a new cutting lip on them made from an old grader blade.



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