[AT] Drill bits

[Bill Brueck]

I've had consistent success sharpening bits freehand on the flat side of a
grinding wheel.  I'm sure my bits have drifted some from the correct angles
but they cut well.

I've not been able to sharpen real small bits this way...maybe about 1/8
inch and less.  I'm just not steady nor accurate enough to do the smaller
bits.  

Study up just a little on bit geometry, there is plenty of information on
the web.  I rotate the bits with my right hand whilst the left hand guides
the bit into the stone.  

Some bits don't sharpen up well, I expect they are tempered just at the
factory edge and once that's ground past the steel isn't any good.  That
seems to be true for some cheaper bits I have bought that cut well for a
little while and then need to be discarded as near as I can figure.

Will be interested where this thread goes.  

Bill Brueck
   Pine Island, MN  USA

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dick Day
Sent: Sunday, October 13, 2013 10:08 PM
To: atis
Subject: [AT] Drill bits

I guarantee that everyone on this list knows way more than I do about tools.

I assume that, like most things, you get what you pay for.  Years ago, I
bought what I thought was a very good (expensive, at least for this wallet)
set of drill bits, that went from just thicker than a hair to 1/2"  They
performed well but over the years they have pretty much worn out, and I hate
to admit it, I broke a few and lost one.  When drilling any type of metal, I
always have a can of 3-in-1 Oil with me and use it liberally.

Does anyone use a Drill Doctor (or similar piece of equipment) to lengthen
the life of your bits?  It looks like they range in cost from $50 to $250. 
Before I invest in a new set of bits, any thoughts on renewing verses
replacing?

Thanks

Dick 

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