Ken:

Keeping a core bit in the middle of a 30" wide brick masonry wall, 
which surely has voids, brick rubble, and mortar slop in the core, for 
40 FEET, seems like something that just isn't going to happen.  And 
then there will be the water and core drilling muck damage to the wall 
when this stuff seeps out of the open mortar joint, the crack, or 
wherever it can.  In theory, and also in practice, one could monitor 
where the end of the bit is, especially if you have enough money.  Use 
acoustic emission and a string of geophones.  I am not giving you a 
quote, but this monitoring should cost about $7-10,000, especially if 
the person with the equipment tags onto your insurance.  In reality, 
they need a better plan -  one that doesn't involve drilling down the 
wall.  How about a pipe on the wall?  That could be done for $500 or 
less.

Steve Stokowski
Stone Products Consultants

-----Original Message-----
From: Gabriel Orgrease <[log in to unmask]>
To: [log in to unmask]
Sent: Fri, Oct 15, 2010 12:29 pm
Subject: [BP] need some help, core bit detection in brick masonry

I need help in figuring out how to determine in real-time the depth and
x.y.z location of a core bit within a 30" width of brick masonry wall 
as
we drill down through the wall 40'. The primary intent is to keep the
core bit at a 15" horizontal depth in the wall.... the undesired result
is if the core bit pops out of the wall.

Best,
Ken

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