drill bit for cast iron

[Jack Houweling]

Hi Bob,

Your problem is your masonry bit. I don't know why 
you where advised masonry bits, I have tried these bits in my shop
 and found them useless except on stone.

I have done this many times using a metal drill bit.
I used only one bit the same size as the bolt and it would
only take a few minutes to drill each hole.

Jack Houweling

 
----- Original Message ----- 
From: "Bob Hull" <hullfam5 at yahoo.com>
To: <pianotech at ptg.org>
Sent: Wednesday, August 23, 2006 9:32 PM
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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