drill bit for cast iron

[David Love]

Cast iron should drill quite easily with a standard bit, though you might
get more life out of a drill made for metal.  I don't think the blade
configuration on a masonry bit is right for cast iron.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Bob Hull
Sent: Wednesday, August 23, 2006 9:33 PM
To: pianotech at ptg.org
Subject: drill bit for cast iron

Drill Bit Question:

Background: Yesterday I was trying to repair an
Everett console that had a separation crack between
the last lamination of the pinblock and the back beam.
 I guess it's glue joint failure and a downward
warping of the wood from the downward pull of the
tuning pins.  

I made plans to install 3 bolts 3/8" x 5"L  after
applying CA down in the crack.  However, drilling
through the plate took about 45 minutes to do 1 hole. 
I used a carbide tipped masonry bit per the suggestion
of a industrial machine tool and  supply co.  I also
tried using a 1/4" bit first and then progressing to a
3/8" bit.  So, I wound up just installing 1 bolt due
to time restraints.  

I have done this repair a few times before but it's
been awhile and I don't remember it taking this long
to drill thru the plate.  I used a good low rpm
electric drill vsr 0-600 rpms.

Any drill bit recommendations?

Thanks,

Bob Hull

  

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