[AT] drill bits

[Ernst Borchert]

	If the drill bit is sharped without using coolant (oil or water) to
keep the grinding wheel from heating up the drill bit, the heat build or
burning will soften the high speed steel in drill bit and it will dull much
faster.

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Cecil R Bearden
Sent: Friday, May 01, 2015 7:15 AM
To: Antique tractor email discussion group
Subject: Re: [AT] drill bits

Gary
I bought a very good set of drill bits in a screw top holder at the 
farms show.   It was the American Made Bit Sales booth.   They have a 
lifetime sharpening and replacement guarantee.   However, I had mine 
sharpened lately, and the sharpened ones seem to be a lot shorter and they
dull much quicker.  My advice would be to just break the bit if you want it
sharpened by them and give them the broken piece that goes in 
the drill.   I got the mechanics length set that has 3 flats on the bits 
for a 3/8 drill.  The set goes from 1/16 to 1/2 by 1/64  i think the set is
made by Triumph.

Cecil in OKla



On 4/30/2015 1:58 PM, k7jdj at aol.com wrote:
> I wonder what type of drill bits work for antique tractor bolt removal and
repairs?  I have been buying cheap throw away Harbor Freight titanium
nitride coated bits but have gone back to using high speed steel bits.  Even
the higher quality coated bits don't seem to work as good as the high speed
steel bits.
>
> The coated bits don't drill as well and are much easier to catch and
break.  It is getting harder to find high speed steel bits. I have a drill
doctor but it doesn't do a good job on the really small sizes.
>
> Would be interested in what others are using or doing that I might be
missing.
>
> Gary
>
> Renton, WA
>
> JD B
> 2 Cletrac model F's
> 1 Cletrac model W
>
> and lots of other old iron
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at


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