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SDS drill bits--sharpening?

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Tom

03-06-2002 06:02:33




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I have a Bosch Bulldog that uses the SDS type bits. Some of the bits are getting dull. Since the bigger ones are pretty pricey, I would like to not have to buy new one. Can the old ones be resharpened? Can I do it myself? If so, How? Any help is always appreciatied.




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Rod MI

03-07-2002 00:03:51




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 Re: SDS drill bits--sharpening? in reply to Tom, 03-06-2002 06:02:33  
As a rule if carbide is to hot to touch with your hand its to hot to quench other wise it will crack on you the green weal is good for the heave work and I like to use your regular wheel to finish polishing Rod MI



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Russ

03-06-2002 08:19:21




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 Re: SDS drill bits--sharpening? in reply to Tom, 03-06-2002 06:02:33  
Hi Tom, I`ve had good luck re-sharpening Hilti bits, just have to use a "green" wheel for carbide tips on your grinder. Nothing fancy about the angles, it`s not like sharpening regular twist drills. Russ



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Tom

03-07-2002 05:55:55




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 Re: Re: SDS drill bits--sharpening? in reply to Russ, 03-06-2002 08:19:21  
I want to thank everyone for their replies.I have a couple of dumb questions, though. What is a "green" wheel"? Can I go to Home Depot et al and get one, or does it have to be from a specialty store?



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VaTom

03-07-2002 15:30:11




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 Re: Re: Re: SDS drill bits--sharpening? in reply to Tom, 03-07-2002 05:55:55  
I don't have one but Grainger calls them "green" too (or silicon carbide), $17.70 and up. I use a small diamond coated wheel in my drill press. Harbor Freight for maybe $10.



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Mark Kw

03-06-2002 08:48:26




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 Re: Re: SDS drill bits--sharpening? in reply to Russ, 03-06-2002 08:19:21  
Tom said most of what I would have but I'd like to add a little more. When you sharpen them on the green wheel, let the wheel do the work, don't force it. Keep the bit cool but don't quench in water. Grind a little and allow to air cool.



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Mike Englebrecht

03-06-2002 23:05:40




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 Re: Re: Re: SDS drill bits--sharpening? in reply to Mark Kw, 03-06-2002 08:48:26  
Keep a SMALL container of karosene to cool your carbide. It keeps the wheel clean also.
Nothing to hot and keep the sparks away, but it is safe and it gives a better finish.
The good clean finnish makes the tool run better and longer.
If carbide gets too hot, you won't see it but there will be micro fractures.
Cool it often.



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