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Tool Talk Discussion Forum

sharpening jackhammer bit

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bustedbudget

01-29-2008 21:38:02




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Hello,

I have several chisels that fit my 90 lb pneumatic jackhammer that need to be sharpened. I have been told they need to be "re pointed" Heated up to the rite temp and drawed out like a blacksmith would do?

I have thought about chucking the chisle up in the vise and taking my milwaukee 9" angle grinder to them.

I have been told they are heat treated/ tempered?

Anyone know anything about this?

If I cant take the grider to them where can I get them re sharpned at?

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dr sportster

01-30-2008 13:40:27




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 Re: sharpening jackhammer bit in reply to bustedbudget, 01-29-2008 21:38:02  
If they are pretty bad you can hardface them and then just use a regular grinder.In the field I have just [unsafe]used the side of a chopsaw and light pressure.Dont change the angle or they tend to get stuck more.This is something you can do yourself because if you have to pay someone just buy a new one.And I dont know how much they cost so how good is my advice.I just call up the contractor and tell them send a new one but my motto is 'I work cheap".Also last time I saw a blacksmith I was at a museum.This post has made me feel like chopping something.The 90 pound is the best one.Good luck.

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bjr

01-30-2008 07:03:25




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 Re: sharpening jackhammer bit in reply to bustedbudget, 01-29-2008 21:38:02  
They gotta get tempered. The local rental stores told me that when I rented a electric jackhammer to punch a hole in a basement wall and they charged for the bits used. bjr



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Red Dave

01-30-2008 05:05:09




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 Re: sharpening jackhammer bit in reply to bustedbudget, 01-29-2008 21:38:02  
You can grind them to a point, but unless you can heat treat and temper it, that point won't last long. We used a forge to do it back when I did that kind of work. Too hard, it will be brittle, too soft and it will just dull fast.



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Bendee

01-30-2008 03:41:43




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 Re: sharpening jackhammer bit in reply to bustedbudget, 01-29-2008 21:38:02  
google "heat tempering". you may be able to do it yourself.



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XRogerX

01-30-2008 09:06:19




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 Re: sharpening jackhammer bit in reply to Bendee, 01-30-2008 03:41:43  
When I worked at a rental company back in 1993, we used to take all of our points to a welding shop where they would get heated in a forge and hammered back to shape by a blacksmith with a power hammer. I know that the tempering wasn't done properly once, and the bits snapped off after very little use.



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oldrustycars

02-03-2008 10:17:10




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 Re: sharpening jackhammer bit in reply to XRogerX, 01-30-2008 09:06:19  
I worked in the rental business for many years. We had a machine to sharpen the bits. Just a flat grinding wheel, and a cam and lever that would rotate the bits back and forth. Just the weight of the bit held it against the wheel, so tghey never got hot. Seemed to work very well. This was only used a dull bits, broken or severely worn ones were sent out.



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