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Thread: Push Drill Fluted Bits
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20th August 2013, 09:43 AM #1
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- Dec 2012
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Push Drill Fluted Bits
Good Day from North Texas,
I do not know if I am thinking to hard on this topic or not. I have never seen an article or instructions on how to sharpen push drill fluted bits? I tried using one of my bits and I think I would have started a fire by friction before I finished the hole. Can anyone help me out? I have attached a picture so ya'll know what I am talking about. Thanks, Chris
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20th August 2013, 02:10 PM #2
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I have two of those drills, I believe that they belonged to my grandfather. So I'll guess 70+ yrs old. As I've kept the original bits, I pound out and file what I need from coat-hanger wire. Kind of use it and toss it.
1. I don't believe that you have to fool with the flutes.
2. You need to figure out what the bevel angle needs to be for a cutting edge.
3. I'll make a wild guess and say 30 degrees (like a woodworking chisel).
= = =
If you touched it up, very, very gently, to 30 and try it and tell us all.
If I had to make a second guess, 25 degrees like a good cabinet maker's skew.
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20th August 2013, 04:10 PM #3
They look very similar to what is used in a Stanley "Yankee" screwdriver (the precursor to the modern cordless drill!).
You should be able to touch them up on a grinder basically the same as you would hand sharpen a normal twist drill.
Alternatively, if they are the same as the Yankee bits then new ones are available.