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  #76 (permalink)  
Old 12-27-2009, 06:44 PM
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I wasnt so lucky with mine it took several attempts ,I couldnt get the hang of it.I watched the dvd and read the dirctions many times but my brother in law came over and took right to it,so I had him sharpen my bits for the longest time, its easy now, but I sure had a hard time at first.

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Old 12-27-2009, 08:22 PM
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Quote:
Originally Posted by deadbodyman
I wasnt so lucky with mine it took several attempts ,I couldnt get the hang of it.I watched the dvd and read the dirctions many times but my brother in law came over and took right to it,so I had him sharpen my bits for the longest time, its easy now, but I sure had a hard time at first.

The best place for that DVD (I got a VHS tape) is in the trash - where mine went - it's beyond confusing.

One thing they don't tell you is that on some drills you actually have to rotate them just a tad (clockwise as you look at the outside end in the holder) to get the correct point heel angle to cut properly. The twist on some drills is different and those 2 little jaws set the cutting edges just a weeeee bit off (I used to fight with the tool room at GE about crappy drill sharpening w-a-a-a-a-a-a-y back in the dark ages when I had a miscellaneous machining area as foreman)

Dave W
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Old 12-28-2009, 07:09 AM
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My Dad (RIP),worked at GE doing R&D way back when I was a kid.. I remember they had an Edison light bulb in the lobby that had been burning for years.One of his favorite stories was seeing a PHD Einstein type tring to drill a hole in a masonite box (the smoke got his attention) the drill bit was backwards.
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Old 12-28-2009, 07:21 AM
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drilling larger holes

If you look at the end of a lage drill bit you will see a small line between the larger lines of the flute edge. That portion of the bit cannot cut but must push the metal out of the way. that's why drilling a smaller pilot hole makes the total job faster. also I sometimes use a center punch and keep punching the the hole as soon as chips quit coming out. to move the center metal out of the way
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Old 12-28-2009, 08:41 AM
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Quote:
Originally Posted by deadbodyman
My Dad (RIP),worked at GE doing R&D way back when I was a kid.. I remember they had an Edison light bulb in the lobby that had been burning for years.One of his favorite stories was seeing a PHD Einstein type tring to drill a hole in a masonite box (the smoke got his attention) the drill bit was backwards.

I haven't been in the R&D center for quite a few years , but my recollection is that they still have one of those bulbs burning as well as a collection of man made diamonds.

And the backwards turning drill bit - one of our high level managers at the Gas Turbine plant was installing a bulletin board in his office next to mine and was swearing at the "dull" drill bit in his cordless......and you know the rest of the story .

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Old 12-28-2009, 08:50 AM
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Have used the Drill doctor for 3 years .......... GREAT tool, not sure what is so confusing about the tool . Real straight forward to use and set up..

AH yes you do need to pay attention as to how the tool holds the bit, and you actually need to look at the way the tool grips that drill bit .

Like this tool so much it lives next to the press. I have actually formed a new habit, dressing out the bit after use and store ... again great tool ..

There are two that have the biggest price tag I say at least get the 100$$ priced one you can dress bits up too 1/2 and at 140$$ you can do 3/4 darn nice tool ..
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Old 12-28-2009, 09:19 AM
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Quote:
Originally Posted by Irelands child

- one of our high level managers at the Gas Turbine plant was installing a bulletin board in his office next to mine and was swearing at the "dull" drill bit in his cordless......and you know the rest of the story .

Dave W
My good friends dad worked designing those blades "Gamble" was his last name.I hope it wasnt him, he sure was smart...Some day someone will invent a drill bit that'll cut in both directions (fool proof) it'll have to be double ended though,someone will put it in upside down
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  #83 (permalink)  
Old 12-28-2009, 10:24 AM
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Quote:
Originally Posted by timothale
If you look at the end of a lage drill bit you will see a small line between the larger lines of the flute edge. That portion of the bit cannot cut but must push the metal out of the way. that's why drilling a smaller pilot hole makes the total job faster. also I sometimes use a center punch and keep punching the the hole as soon as chips quit coming out. to move the center metal out of the way
I knew drilling a pilot hole made the job easier but never thought about the reason why. Thanks for your post. Makes sense.
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Old 12-28-2009, 11:19 AM
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Maybe straying off the subject just a little bit (no pun intended) but these things are handy as a shirt pocket and this one from Harbor Freight works great, I have used mine for several years now.


http://www.harborfreight.com/cpi/cta...Itemnumber=621




Sure you need to buy something like a Starrett if you are using it in a full time machine shop setting but these HF outfits work really good and hold up just fine, a real bargain at $4.99 but usually on sale almost free at $2.99. For three bucks you might think it to be a total piece of junk but this one (the brass one I have not tried the other one) seems to be just fine and does the same job as the much more expensive pro tool.
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  #85 (permalink)  
Old 12-28-2009, 04:56 PM
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I'll second that Red... I use them HF center punches too.I just put a bit of a sharper point on them.It save a lot of time when you got few hundred spot welds to drill out of a 1/4 panel.
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Old 12-29-2009, 01:47 AM
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Drill Doctor has a feature to make a "split point", I think they call it. This is a separate grinding that cuts away that flat bridge (web) between the flutes. This makes starting a hole more precise, the drill does not wander, and drilling the hole is easier. If you have a Drill Doctor, use this feature and you will love it. However, I usually use a pilot hole too. Make the hole just a bit larger than the web of the drill you are going to use for the final size. You can buy split point drills, but why, when you can grind them yourself.

JME
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