Fw: [TowerTalk] Drilling Chrome-Moly Steel w0yg@prolynx.com

[kk9a@arrl.net]

In a machine shop I used to drill 4140 Chrome-Moly with regular
High Speed Steel drill bits.  This was in a drill press, I know that it's
a lot tougher with a hand drill on a tower.  I still think a regular HSS
drill should work for you.  Be careful not to run it too fast and work
harden the surface and also use a cutting oil.
73,
John

-----Original Message-----
From: Charlie Summers
To: towertalk@contesting.com
Sent: 6/18/2001 4:28 PM
Subject: [TowerTalk] Drilling Chrome-Moly Steel

Can someone please tell me what type of drill bit I need to drill out a
5/16" diameter hole in my existing 2" mast with 3/8" wall.  I want to go
to
5/8 if possible but the mast may just be too hard.

I would rather stay away from the real expensive, like $150.00, drill
bits,
instead preferring to use several say cobalt tipped or titanium tipped
or
some kind of hardened steel bit.

I have looked at McMaster-Carr's catalog and see what they recommend in
print but was hoping someone would be able to give me guidance based on
experience.

The other hooker is I have to drill this on the top of a tower so
staying
there for hours will not be pleasant, especially with a heavy half inch
drill.

This is a rather personal request on a Tower-Talk related subject so
personal replies might be in order to:  w0yg@prolynx.com

Thanks and 73,

Charlie, W0YG..>>



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List Sponsor: Are you thinking about installing a tower this summer? Call us
for information on our fabulous Trylon Titan self-supporting towers - up to
96-feet for less than $2000! at 888-833-3104 <A HREF="http://www.ChampionRadio.com">
www.ChampionRadio.com</A>

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FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
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