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#60305 - 12/28/05 09:02 PM Dull Drill Bits  
BigJohn  Offline
Member
Joined: Mar 2004
Posts: 391
Boston, MA
I end up using paddle bits a lot during rough-ins when an auger-drill isn't available or would just be too inconvenient to use. All the use dulls bits in a heartbeat and a new paddle-bit might only last me about five days.

Can these things be sharpened effectively?

I've been looking into using different types of bits, ones that have a circular blade seem like they might work better: more cutting area = longer life? But a lot of these bits seem designed for precision wood work, not use and abuse with framing lumber.

Am I stuck constantly shelling out for new paddle bits or does anyone know an alternative?

-John


Work Gear for Electricians and the Trades

#60306 - 12/28/05 09:32 PM Re: Dull Drill Bits  
BobH  Offline
Member
Joined: Oct 2004
Posts: 135
Newfane, N.Y USA
Big John, hit em with a grinding wheel. I've been using the same cheapo bits forever and this is what I do. Either that, if you have time, a file.


#60307 - 12/28/05 09:44 PM Re: Dull Drill Bits  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
You can also ruin a perfectly good drill bit by sharpening the wrong part of it or by sharpening it at the wrong angle. [Linked Image]


#60308 - 12/28/05 10:12 PM Re: Dull Drill Bits  
BigB  Offline
Member
Joined: Mar 2004
Posts: 719
Tucson, AZ USA
Bosch makes paddle bits with screw tips. I bought some and so far they have held up really good, plus they really plow thru the wood fast. By the way, a forstner bit works well in those tight spaces.


#60309 - 12/28/05 10:40 PM Re: Dull Drill Bits  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,123
Estero,Fl,usa
I agree with Bob. I have found rusty spade bits in the yard and brought them back from the dead.
You do need a bench grinder with an adjustable guide, at least I do but I can get them very close to the factory angle.
I have had a lot worse luck with twist drills and the assortment of sharpening tools I have accumulated over the years.


Greg Fretwell

#60310 - 12/28/05 11:50 PM Re: Dull Drill Bits  
u2slow  Offline
Member
Joined: Sep 2003
Posts: 200
Salt Spring, BC, Canada
Tried the Milwaukee self-feed bits? I've only tried one briefly, but it worked well.

[Linked Image]


#60311 - 12/29/05 12:37 PM Re: Dull Drill Bits  
BobH  Offline
Member
Joined: Oct 2004
Posts: 135
Newfane, N.Y USA
I've never ruined a bit to the extent that I can't fix it. It's just a paddle bit, so what if you get the wrong angle, they'll still cut like new. I do the same with my regular drill bits, just takes a little practice. Better than buying bits every week like he's doing now.


#60312 - 12/29/05 01:51 PM Re: Dull Drill Bits  
kdal  Offline
Member
Joined: Sep 2005
Posts: 34
Florida,U.S.A.
I sharpen my augers and paddle bits with a dremel.Works great with a little practice. It also helps to have a new or good bit to go by.


#60313 - 12/29/05 02:55 PM Re: Dull Drill Bits  
Spark Master Flash  Offline
Member
Joined: Jul 2003
Posts: 141
Las Vegas, Nevada, USA
Hey Big John,

The flat face of the paddle bit meets the beveled end to form a sharp cutting edge. After a number of cuts, that edge gets beat up. Since this is a quick and easy thing to sharpen, I won't go into a lengthy diatribe about how to sharpen plane irons, chisels and scissors.

Here are a few tips.

- Maintain the factory bevel angle as you re-grind the bevel on the end.

- Don't grind the scoring burr off the end of the cutting edge, if you have such a burr.

- Grind the bevel until the flat face and bevel angle meet again all the way across.

- Don't overheat the metal. It can get too hot, especially right at the very cutting edge where the steel is thin. Quench it in some water here and there so it doesn't heat up. You can remove the temper of the steel by overheating, which will leave you with a claylike drill bit that will last about as long as a drill bit made of Silly Putty.

- There should only be two angles to make your cutting edge: the face and the bevel. Don't try to put another little bevel on the face side of the cutting edge. That will ruin the cutting action.

- Since paddle type bits have a sharp point in the center and sometimes scoring burrs at the perimeter, it is a good idea to do that kind of job with a Dremel.

- Don't leave the bit with an overhanging burr on the edge. You can use a fine diamond stone to flatten the face of the paddle bit and take off that burr. Go back & forth, face and bevel, until the burr is gone.

Remember, don't re-grind new angles on the bit. As you study the bit and all of its angles, you'll see where the cutting edge is located. The cutting edge might twist and turn slightly around the point and burrs, so when you sharpen the points keep the factory bevel intact.

One more little concept to ponder. To get the sharpest edge possible, first flatten the face of the bit with a diamond stone and work your way up through the grits until it's flat and smooth. Then work it over for a while with red jeweler's rouge until it's like a mirror.

Now that the face is flat, grind the bevel, work up through the grits and polish to a mirror finish.

Now you don't need a drill. You can hand-turn your mirror-finish drill bit through 6 inches of bird's-eye maple.

I'm happy that I can now sharpen everything I own, including Xacto knives (most people don't know how to sharpen things that are already that sharp), razor blades, drill bits, planes, chisels, scissors, axes, serrated blades, screwdriver tips, hammer claws, table saw blades, circular saw blades, hand saws, band saws, etc.! NOW DEN!

I taught a female artist friend how to sharpen a chisel, I flattened both faces on an old set of scissors she bought at a garage sale to return them to like-new shearing action, but she keeps trying to get me to sharpen all her stuff. Be wary of trying to teach a woman how to sharpen things - they don't want to know how to do it. Don't let anybody know you know how to sharpen anything. If you meet the wrong person, you'll be strapped to the sharpenin' post from now 'til the cows come home.


"When in doubt, short it out"

#60314 - 12/29/05 03:36 PM Re: Dull Drill Bits  
e57  Offline
Member
Joined: May 2003
Posts: 2,876
S.F.,CA USA
Those milwaukee self feed bits a service can be provided to swap out sharp ones. I've known a few shops, especialy plumbers who get a service to resharpen them.


Mark Heller
"Well - I oughta....." -Jackie Gleason

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