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PostPosted: Tue Oct 26, 2010 3:43 pm 
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Elite

Joined: Mon Nov 16, 2009 8:06 am
Posts: 616
Location: Trenton, Michigan
I have a couple brad point drills that are not cutting as good. What is the way to sharpen them?

Steve.


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PostPosted: Tue Oct 26, 2010 9:02 pm 
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Obsessed
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Joined: Tue Aug 22, 2006 12:39 pm
Posts: 4969
Location: Livonia
Boy...lotsa crickets chirping here Steve...

I was hoping this question had a whiz-bang answer! :-k

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PostPosted: Tue Oct 26, 2010 9:07 pm 
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Elite

Joined: Mon Sep 29, 2008 1:02 pm
Posts: 414
If you're good with a grinder and have a flaring cup wheel, that will work. If the bits aren't too bad, you might use an abrasive stick and touch it up by hand. I've seen advertised those diamond hone sticks that sort of resemble a file, and they might work but somehow I envision them being very slow-cutting. If there's an elegant answer to your question, I'm not aware of it.

Steve


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PostPosted: Tue Oct 26, 2010 9:43 pm 
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Master

Joined: Sun May 09, 2004 7:50 pm
Posts: 247
Location: southfield, mi
as long as you dont let them get stone dull diamond files work great

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PostPosted: Wed Oct 27, 2010 7:00 am 
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Elite

Joined: Wed Mar 16, 2005 4:22 pm
Posts: 601
Location: Monroe, Michigan
Peter Galbert, a noted Windsor chairmaker, has instructions on his blog about how to grind a regular twist bit to make a brad point on steroids. Here is the address

http://chairnotes.blogspot.com/search/label/Drill%20Grinding

I'm not sure that this is exactly what you are looking for, but it may give you some ideas. I haven't ground a bit this way, but I've used them and they work well. If anything they are a little too aggressive.

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PostPosted: Wed Oct 27, 2010 8:08 am 
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Master

Joined: Wed Feb 23, 2005 3:49 pm
Posts: 219
Location: Charlotte Mi.
Use a Dremel and a small diameter grinding stone to sharpen a brad point. I use a tapered,cone or bullet shaped stone.
Two things to be aware of:
* Make sure to follow the slight taper away the cutting edge. You can see the taper by holding the drill bit with the point pointing up. Looking from the side you will see how the bit tapers down away from the cutting edge. The top surface is where you will be grinding.
* Remove the same amount from each side of the bit. Do this by first coating the grinding surfaces with a black felt tipped marker. With a light touch, grind off the black marker. If the edge is nicked, you may have to repeat the steps several times to remove the damage.
Keith

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