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Sharpened drill bit dulls quicky

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john

11-26-2002 11:01:32




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I used a drill Dr sharpener on a 3/8" twist drill bit, worked well in wood but after the first pass in steel it dulled so bad it wouldn't drill wood any more. I will try sharpening again, did I get the angles wrong or is the bit material soft? Can these bits be heat treated to make them stay sharp longer? Any ideas are greatly appreciated-

john




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Wayne W

11-28-2002 07:05:39




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
One more thing, not yet mentioned. Make sure you are dealing with a high speed steel drill bit. If you are using a drill bit designed for wood, it just won't work!! The drills designed for wood have a slower twist in the flute section than HSS.

If this helps, great. If not, perhaps you can seek out someone close by who is more experience in sharpening drills. We've all gotta learn, - and usually an experienced teacher sure helps. (Don't expect to be able to live long enough to learn it all through my own mistakes!)

Good luck.

WW

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Tom

11-28-2002 06:33:44




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
The other comments are all good information. I am not experienced with any of the drill sharpners. I use a belt sander, high speed for metal, and a drill point gage. You can get a drill point gage for from about 8 to 20 dollars in any machine tool catalog. It will help you to get the porper angle, and most important, the same length cutting edge on each flute. As was srtated, look at the edge of a new drill, learn to duplicate this using the drill point gage to check equal amounts of grinding on each flute. Finish the edge, if you are not using a very fine wheel or belt, with a hand stone to make it smooth. A rough cutting edge from a corse wheel or belt will not last. A few minuts spent learn to do drills free hand and you can sell the drill sharpening devices to someone else.

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JT

11-27-2002 10:41:19




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
I have a DD also. I really like it but you still need to take your time. Be sure that that step 1 is done according to the instructions. Make sure the bit is bottomed on the little plate and the springs have a hold in the volute. When you are sharpening keep turning until it isn't hardly grinding at all. Don't try to go to fast as mentioned earlier this can heat the bit to much and cause it to lose it's temper.

LOL

JT

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CR

11-27-2002 09:59:44




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
A couple of things for you to look at.
When you are sharpening the bit, be careful not to overheat the area that you are grinding. If the tip of the bit is blue or yellow it has been overheated and will dull rapidly. I usually keep a can of water next to the grinder and periodically dip the bit to cool it when sharpening. Look at the rake of the bit (from cutting edge back to trailing edge). The trailing edge needs to be lower than the cutting edge. The angle of the bit (from the center tip to the bottom of the cutting edge) also determines what the bit is used for. I usually set my bits at 135 degrees for heavy steels, and 118 degrees for thin materials. The best thing to do is to take another unused bit and use it to compare to the one to the one you are sharpening. This will let you see the correct angles and rake you are trying to get. When cutting steels keep your drill speeds low. Use a cutting oil, I have used motor oils when that was all that was around. The oil cools the bit and will keep it from dulling as fast. When drilling you want to see two spirals coming out of the bit, one from each cutting edge. If the angles are incorrect one edge will cut more then the other and will dull faster as it is doing the work for both.
Hope this helps

CR

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John M.

11-26-2002 21:29:16




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
Be sure to read the instructions! The DD will not always do a perfect job. You may not have enough clearance behind the drill lip. Turning the bit slightly from the setup position will give more clearance. A book called Machine Shop Practice has drill speed tables and the formula for figuring it out. I can't locate mine now, but 200 rpm is too slow for drilling mild steel.My B&D 1/2" single speed drill runs at 500 rpm; I think the 3/8" bit should turn around 1200. What kind of steel are you using? If it's common old bed rail, that's the worst stuff, with hard spots. I think the rails are tempered; you'll seldom see them welded, only riveted.

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F14

11-26-2002 12:59:52




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 Re: sharpened drill bit dulls quicky in reply to john, 11-26-2002 11:01:32  
I've got a DD, pretty near impossible to get the angle wrong.

What did you use to drill through the steel? Most hand-held drill motors run too fast and will burn the drill. For a 3/8 drill, you should be running somewhere around 200 rpm. Resharpen it and try it again in a drill press, or with a large (like 1/2") drill motor that runs slower.



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jim

11-27-2002 14:51:52




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 Re: Re: sharpened drill bit dulls quicky in reply to F14, 11-26-2002 12:59:52  
Seems to me I remember a simple jig to check the correct final angle. That was to weld two hex nuts face to face and if the newly sharpened bit fit the angle formed by the nuts , you had the proper taper on the bit. Hope I've got that right.



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