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Drill bits

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IHMAN

11-04-2002 16:06:49




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I have forever been dissillusioned by drill bits. I had recently been told that the 135 degree angle tip or the Black & Decker bits with the starter tip (self starting, no draft) are the best bit on the market for general purpose drill press use.....anyone had any experiece with these bits?
These $19.95 drill kits burn up with about two attempts to drill 1/2" material.




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Neal in NM

11-09-2002 15:12:43




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 Re: Drill bits in reply to IHMAN, 11-04-2002 16:06:49  
I was a tool and die maker for many years (I now own a machine shop). As an apprentice I sharpened MANY drill bits. I use a drill point gauge and a pedestal grinder. For the home shop, I would not recommend the 135 deg grind, which is usually for tool steels in a very rigid setup. I use 118 deg for general purpose. I recommend High Speed Steel drill bits (DO NOT USE CHINEESE). They are easy to sharpen, inexpensive and hold up better to stress. The coated ones are actually for production where seconds count, the coating comes off very easily if not in a rigid setup, so IMHO they are a waste of money for home or occasional use. I have never found an automatic drill bit sharpener that is worth a dam, the problem is in the relief angle I have always had to touch it up after a drill bit sharpener. I can actually sharpen a drill bit faster than an automatic sharpener. As far as speeds go, it sounds like you are spinning the drill too fast. For mild steel, I use a simple formula 180 divided by the diameter of the drill bit. i.e. a one-inch drill should spin 180 rpm and a 1/2-inch drill should spin 360 rpm. now this is general and will get you close. There is a proper formula, which I can't remember right now but if anyone wants it email me and I will look it upin my notes. N

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Don Young

11-06-2002 20:14:47




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 Re: Drill bits in reply to IHMAN, 11-04-2002 16:06:49  
The point angle doesn't matter near as much as having the two sides the same, having the clearance angles reasonably correct, and having the drill made from a decent steel. Some of the inexpensive drills are made from poor material and are incorrectly sharpened when new.



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Scott Green

11-05-2002 02:44:18




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 Re: Drill bits in reply to IHMAN, 11-04-2002 16:06:49  
I worked at a place where we used all different drill bit angles , custom ground in the machine shop. After the tool grinder showed me the thery of sharpenning drill bits , I've done all my own sharpenning at home. I just pick an angle(guess at the degrees)which fits the project I'm drilling , and start drilling. About 15 - 30 seconds on the belt sander , and drill bit is sharpenned.



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Don LC

11-06-2002 06:41:41




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 Re: Re: Drill bits in reply to Scott Green, 11-05-2002 02:44:18  
Scott ---- How about telling us what the tool grinder told you.....I have a bunch of dull drill bits,but I don't want to spend the money on a bit sharpener..... ....



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jake

11-04-2002 19:21:16




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 Re: Drill bits in reply to IHMAN, 11-04-2002 16:06:49  
The 135 degree drill bits are usually the split point bit type. The tip does not have the large web that the 118 tips have and when drilling it does not wander from a center punch mark. These drills are found at enco.com and used in metal working. Check out the drill doctor site, I have the 750 model and can make or sharpen either, it will explain the difference.



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Tom

11-04-2002 17:17:47




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 Re: Drill bits in reply to IHMAN, 11-04-2002 16:06:49  
If you are burning up drill bits with only two holes you are probably running the drills too fast. It is better to be too slow than too fast. Most drill presses will not run slow enough for a 1/2 " hole. You need one with double reduction belts that will get the speed down to less than 200 rpm for drilling 1/2 to 3/4" holes. The drills need to be sharp. Learn to sharpen them. Look at a new drill and learn how to grind the angles on a dull one. Finish with a fine wheel or stone the edge smooth, it will last longer. Use a cutting oil, or at least some engine oil if you don't have cutting oil. Look up the proper speed for the drill you are using and don't go faster, if anything go slower. Make sure you keep the drill cutting, you want to see a continous chip comming out of the hole, actually two, one from each flute. If the drill is turning and not cutting (no continous chip) it is dulling the edge. Keep it cutting. Drill a pilot for holes much over 1/4 (more or less) inch. The pilot should be about the size of the small straight section of the drill point that is between the two angled cutting edges, about 1/8" for a 1/2" hole. It can help to work up to a larger hole size in steps, say 1/4 " dia. at a step until you get to the finished size.

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JRN

11-04-2002 23:07:37




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 Re: Re: Drill bits in reply to Tom, 11-04-2002 17:17:47  
Here is a link to bookmark.



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John S-B

11-06-2002 16:10:01




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 Re: Re: Re: Drill bits in reply to JRN, 11-04-2002 23:07:37  
Hey that's a great chart to have, thanks for sharing that with us!



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