[TowerTalk] Drill bits

[hanslg at aol.com]

 An HSS type should do the job. You have to use some oil to avoid burning/overheating the drill though. If you want to be a little fancy you can buy a carbon-nitride drill bit. They, usually, are gold colored and come with "life-time warranty" how much that now is worth. You should still use oil during the drilling as that extend the lifetime of the drill quite a lot.

An other avenue is to resharpen the drill after it gets dull, but that requires a grinder and some skill. You get good at it after some time though.

Hans - N2JFS



 

 

-----Original Message-----
From: Guy Molinari <guy_molinari at hotmail.com>
To: towertalk at contesting.com
Sent: Tue, Mar 23, 2010 11:11 pm
Subject: [TowerTalk] Drill bits



Hi all,

    I don't know why this is so hard.   I'm trying to drill out some hole on 
some 3/8" steel plates that I'm going to have galvanized.   I bought a 13/32" 
drill bit and it worked great for about 10 holes or so.   The problem is that I 
have about 140 more to go.   Any recommendations on a good quality drill bit?   

 

73,

Guy, N7ZG
                      
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