Subject: drill bits

From: [email-masked] (Roger Olsen)
Date: Tue, 6 Aug 1996 06:32:19 -0800

as long as were having this discussion on the merits of different drill
presses i would like to throw in a question on drill bits. in a
blacksmithing or metalsmithing shop repeated drilling of the same size hole
is often required and drill bits can become a consumable item, so starting
with the best quality and treating it properly one can hope for a longer
life, my question: drill bits are available that are called; 'heavy duty
cobalt bits", "solid carbide bits", "carbide tip", "heavy duty machine",
"bullet pilot point", "high speed twist".

I have found better life and cleaner cuts with the bullet pilot point bits
than with the  genaric standard high speed twist drills, but longest life
with the carbide tip. i have never had a solid carbide bit, or a cobalt
bit. can someone comment on these types and or add other styles, makes, or
suppliers to this discussion.

thanks,  roger olsen

fom the east slope of the cascade mountains in north central washington.

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From: "[email-masked] 415.855.5707" <[email-masked]>
Date: Tue, 06 Aug 1996 08:15:10 -0800 (PST)

I've been drilling some heavy sections of stainless steel lately (3/8" to 1.5"
thicknesses).  The prpoer cutting speed and feed, plus a good tool lube/coolant
can't be over-emphesized.  Check out the Machinery Handbook, it has loads of
good info on the subject.

Joe