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Tool Talk Discussion Forum

drill bit

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hay

12-20-2005 06:04:48




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what, if any, is the advantage of a 118 deg drill bit vs. a 59 deg drill bit? only thing i can see is the 118 deg bit "bites" into the metal slightly better. do they drill cooler? are they supposed to last longer? can they be run a faster speeds? thanx for any info.




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Adam2

12-23-2005 00:27:47




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 Re: drill bit in reply to hay, 12-20-2005 06:04:48  
The Drill Doctor 500X product lists the ability to sharpen in either 118 or 135 degree angles.

The "blunter" 135 degree angle would be useful for drilling tuffer material, without crumbling.

You may want to look into using "split-point" drill bits for easier drilling.

The split point feature takes the normal center cutting edge of the center of a twist drill bit and divides it in two, meaning less drill bit "walking" and less pressure to use.

The biggest drilling performance improvement I've found in drilling metal, as a former Machinist, is the use of a center punch mark, a pilot hole and some form of lubrication/coolant.

I hope this has helped.

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Bill WI

12-20-2005 06:52:50




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 Re: drill bit in reply to hay, 12-20-2005 06:04:48  
Sounds like same difference to me. The 118 degree is included angle and 59 would be just to center. Would be kinda hard to sharpen a 59 degree included angle.



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