Drilling Thru 12 Inch Block+Inner Wall

The wall is ceramic tile, drywall, foam, and then 12" concrete block (I can't detect any hollow). I have a 12" long masonry bit but the total wall is something like 18 inches! Is there a way of detecting where the drill is located from the outside (after maxing the depth from the inside)? I was wondering about studfinders that can detect live wires and metal studs or a non-contact voltage detector and connecting a live wire to the bit or rod...any thoughts on this? Thanks! Bob_V
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Cut a metal hanger, sharpen the point and chuck it into your drill. Drill the max depth with the masonry bit and then use the wire to complete the hole.
A hanger will go through both wood and block. BTDT
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On Thursday, August 1, 2013 7:05:52 AM UTC-4, DerbyDad03 wrote:

Or just buy a longer drill bit.....
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On Thursday, August 1, 2013 6:05:52 AM UTC-5, DerbyDad03 wrote:

Seriously? Do you use HS (I know you don't use hammer-setting!)?
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DerbyDad03 wrote:

If the block has the cored grouted (cemented) it aint' going through. An extension for the bit should do the job if the hole size is at least 5/8" or so.
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On Thursday, August 1, 2013 9:23:15 AM UTC-5, Pete C. wrote:

1/4 in. so I'm limited unless I go larger...
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On Thursday, August 1, 2013 10:10:46 AM UTC-5, Bob_Villa wrote:

Has anyone taken the carbide end off...and silver-soldered it to a slotted rod?
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On Thursday, August 1, 2013 11:52:55 AM UTC-4, Bob_Villa wrote:

An

d rod?
Silver solder won't hold up.
Start on the outside and drill a test hole to see if the block is hollow. If it is, drill your outside hole and use a piece of wire to figure out how far you are from the sides of the hollow space in the block. Then you sho uld be able to use a tape measure to hit the same hollow from inside. The holes won't be exactly opposite but probably close enough. You can make th e outside hole a bit bigger to help. Then get that concrete patch in a cau lk style tube to "grout" the hole after you run what ever it is you want to run through it.
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What's with all the half-assed measures?
Get a longer drill.
--
Dan Espen

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On Thursday, August 1, 2013 1:21:34 PM UTC-5, net cop wrote:

You probably mean drill bit...Mr. other half of the ass!
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Just for the record, I did not call you an ass did I?
Do what you want.
--
Dan Espen

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On Thursday, August 1, 2013 5:58:21 AM UTC-5, Bob_Villa wrote:

an't detect any hollow). I have a 12" long masonry bit but the total wall i s something like 18 inches! Is there a way of detecting where the drill is located from the outside (after maxing the depth from the inside)? I was wo ndering about studfinders that can detect live wires and metal studs or a n on-contact voltage detector and connecting a live wire to the bit or rod... any thoughts on this? Thanks! Bob_V
An extension holder for the bit is not that expensive, assuming you have a decent hardware store within 20 miles or so.
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If you have an electric welder, weld a bit of rod on and extend the drill. You might have to bash it about a bit to get it straight.
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So If you are unlucky and hit a web you lack 6" of depth in the concrete block; if not on a web, maybe 1 1/2". For that, you could take a steel rod, shape the end some and bang away with a hammer. Ultimately, you'll probably pop out a sizeable chunk.
As far as going from the other side, how accurately can you drill and measure?
--

dadiOH
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