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Tool Talk Discussion Forum

Sharpening masonary drill bit:?

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Robert in Md

03-02-2006 18:19:22




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I have some masonary hammer drill bits that need sharpening. What type of grinder stones are used to sharpen them . I thought it was the green type but can't remember the name. Will this stone also sharpen carbide lathe tool bits. Thanks Robert




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Robert in Md

03-03-2006 04:39:05




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 Re: Sharpening masonary drill bit:? in reply to Robert in Md, 03-02-2006 18:19:22  
Thanks guys for your relys, I,m going to order the grinding wheels and other stuff from ENCO since I haave a free frieght number for this month . Thanks again.



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Ford Man

03-02-2006 19:58:55




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 Re: Sharpening masonary drill bit:? in reply to Robert in Md, 03-02-2006 18:19:22  
You want a green silicon carbide wheel for sharpening carbide.If you can't find it localy try mscdirect.com or mcmastercarr.com

Ford Man



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DADDY E

03-02-2006 19:28:09




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 Re: Sharpening masonary drill bit:? in reply to Robert in Md, 03-02-2006 18:19:22  
You are right about the green grinding wheel.
You can get them at a hardware store.
They have "crystolon" partical structure used for grinding carbide. Diomond wheels are superior but are much more expensive, the green wheels do a good job for what you are doing. They wear down much faster than the regular wheels used
for grinding steel. This is necessary as the
wheel particals get dull and wear away bringing
up a fresh new surface as the cabide dulls the wheel surface rather quickly. After sharpening
the drill,grind a small negative angle (1/16) on the front cutting edge. Approx. 15 degrees from centre line of drill. That will make the cutting edge stronger hence last longer between sharpenings especially when used in a hammer drill. The green wheel sharpens lathe tools as well..... Eldon

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Thoughts

03-02-2006 18:41:57




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 Re: Sharpening masonary drill bit:? in reply to Robert in Md, 03-02-2006 18:19:22  
The green wheel you're talking about is "crystalon" as I recall. They can grind carbide but it's a slow process and wears the wheel almost like a wheel dresser. It's much better if you can get near a diamond wheel.



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