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Tool Talk Discussion Forum

Left handed drill bits

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MAC,IL

08-31-2004 18:23:31




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I know a guy gets what he pays for, but anyone ever use or own that 39.00 set of left hand drills from Northern Tools.




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TheRealRon

09-01-2004 01:36:22




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 Re: Left handed drill bits in reply to MAC,IL, 08-31-2004 18:23:31  
I've had that set for a couple of years. They work fine for me.



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bubba

08-31-2004 21:52:04




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 Lets face it in reply to MAC,IL, 08-31-2004 18:23:31  
Most drill bits become dull from trying to hog a hole into metal.Most people think they can get by with drilling only one hole.Bits will last MUCH longer if you start out with a small bit and work up to the size of drill you want. Forcing a bit to do more than it should and drilling at a faster speed that you should creates a lot of heat which removes the temper of the drill cutting edge and then it is all over for that sharpening. Its not always a case of "cheap" drill bits.In fact it almost never is the case. A pilot hole is key to keeping drill bits sharp.

And another tip.Don't just stop at tightening one hole in the Jacobs chuck.Tighten the chuck in all 3 holes.That will keep the drill from spinning in the chuck most times.

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txblu

09-01-2004 06:06:28




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 Re: Lets face it in reply to bubba, 08-31-2004 21:52:04  
2 additional comments that I have learned over the years:

Always use a quality cutting oil.

Hold speed down to a level that will allow the material to show evidence of being cut; i.e. spiral screw shavings or chips and put lots of pressure on the bit (preferably drill press vs hand drill).

Worst thing I did early in life (when they didn't have variable speed) was run the drill at 2000 rpm or whatever it was and use no cutting oil. I could dull a bit in 2 minutes.

Today I don't remember the last time I dulled one.

Mark

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NC Wayne

08-31-2004 18:31:53




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 Re: Left handed drill bits in reply to MAC,IL, 08-31-2004 18:23:31  
I can"t say as I have ever used one of the Northern sets, so I can"t offer an opinion on their particular brand, but I can speak in general terms. If your using a left handed bit your most likely trying to remove a broke bolt, etc. It never fails that the bolt you need to drill out was either a Gr8 bolt to start with or for some reason got hard during use. Like you said you get what you pay for, and in my experience with "cheap" bits in general you might get one bolt drilled before it gets dull. If bolt removal, etc is what your shooting for then you"d be better off to spend a little more initially on a set of bits that will stay sharp through multiple uses instead of having to sharpen or replace bits after or during each use.

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Steve-Maine

09-04-2004 14:10:14




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 Re: Left handed drill bits in reply to NC Wayne, 08-31-2004 18:31:53  
I bought a set from Northern and had very good luck on exhaust studs. I always start with the smallest bit and go up one size at a time.



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