Drilling plate

[Bob Hull]

Joseph Garrett wrote:
 
> Bob,
> Just use a Sharp Jobbers Bit and be done with it! No
> need to use a carbide bit, IMO. Also, use a high
> speed/torque drill! IMO, you got bum advice from the
> machine tool jjoint!

Thanks folks.  I don't know why this man (the retired
owner of the machine tool and supply store) gave me
this poor advice about using a masonry bit.  There are
pianos whose tuning pin field will not permit bolts,
so using existing screw holes would be the method for
that scenario.


Bob Hull

> > 
> Bob Hull said: "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?"
> 
> 



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