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Tool Talk Discussion Forum

Sharpening of a large steel bit

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Ollie3

11-18-2006 16:04:32




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I would like to know if there is a commercial sharpener for a 1' to 1-1/4 in hss steel bits. I have trouble sharpening these large bits. Some times its ok and then a bummer. I do not like to spend $100. for a new bit if the old one can be sharpened.




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Ol Chief

11-20-2006 05:02:23




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
Keep in mind that dhe drill will make a hole larger than it's intended size if the cutting edges are unequal in length. This is caused by the drill being strained and pushed off center by the longer cutting lip.



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JOHN HARMON

11-19-2006 07:47:01




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
I probably should not offer any advice on this as I do not sharpen any Drill Bit with a Grinder,rather I sharpen all my drill bits no matter what size ,Free hand and use a vertical 2" Belt Sander. If a lot of dressing is required I use a Disc Wheel with a 80 Grit Disc attached. My Disc Sander is from 'Delta" and the Vertical Sander is from Foley-Belsaw. John



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Midwest redneck

11-19-2006 04:28:48




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
I use a belt sander for sharpening HSS bits, it works great. I also use a surface grinder for the smaller bits.



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MikeCatthemuseum

11-18-2006 22:11:20




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
Actually, the big ones are easiest to sharpen... if you have a big enough grinder. Trying to slide the lip along a gouged up 6x1/2" bench grinder wheel is just not going to work. You'll need at least a 1" wide wheel, and a well dressed flat one to get it right. Also, buy or make yourself a drill point gauge. I keep a Starrett on hand and it makes all the difference in the world. You cannot guesstimate the lip angles and have it work right.

Another thing.. are these bits just naturally dulling or are they being damaged? If it's the corners burning up, you are running too fast and/or feeding too slow. What is the material being drilled and how thick is it? You can use alternate points and angles in many cases and get a lot more holes per drill.

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msb

11-18-2006 17:15:31




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
2 ordinary hex nuts or as some people used to call them,taps, tack welded together or just put together (flat to flat) make a good gauge for grinding the angle.



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big jt

11-18-2006 16:53:39




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
MSC has some as do other machine tool supply outfits. Check the next page when you look at the link for more options.

Hold on to your shorts when you look at the prices though.

jt



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What

11-18-2006 16:27:02




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 Re: Sharpening of a large steel bit in reply to Ollie3, 11-18-2006 16:04:32  
I've done to sharpen big ones, grind them the best you can (a gauge is helpful) then try it at the slowest speed and stop the drill while it's in the cut. Take note if only one side is cutting- if it is keep track of which side it is and go back to the grinder and grind a little off that side. Do this until you get a balanced cut on both sides. I've also had good luck using a large belt sander for sharpening them.

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Areo

11-18-2006 18:36:28




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 Re: Sharpening of a large steel bit in reply to What , 11-18-2006 16:27:02  
I agree on trying it and watching how it cuts and then regrinding according to the cut pattern. It may take more than one regrind, but it will get you there.

Areo



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