Safe cracking.

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ptonsparky

ptonsparky

Tom
Location
NE (9.06 miles @5.9 Degrees from Winged Horses)
Occupation
EC - retired
Alright, maybe it's just core drilling an old bank vault. Need to put a new service on an old bank building. Water line is in what used to be the vault and some years ago converted to a restroom. Is core drilling this going to take more than 1 day? About 18" of concrete plus embedded goodies. Probably a 2" hole.
 
D

drive1968

Senior Member
It took a professional core drilling company about two hours to drill a 12" wide hole into a local bank's vault that is 18" thick. There was a kid locked inside a time-activated vault. An experienced driller could make a 2" hole in about twenty minutes with the proper diamond bit.
 
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billsnuff

billsnuff

Senior Member
Location
East of 480sparky
Maybe these guys can help ?

Maybe these guys can help ?

Butch-Cassidy-Sundance_400.jpg


Sorry, it's Friday, I'm bein' silly.....:D
 
roger

roger

Moderator
Staff member
Location
Fl
Occupation
Retired Electrician
I would put in about 4 hrs which should more than cover it if you have the right tools and people who know how to use them. If you don't have experience using core drills make it 6 hrs or use a core drilling company as drive1968 mentions, they will knock it out and be gone in a couple of hours.

Roger
 
C

Cow

Senior Member
Location
Eastern Oregon
Occupation
Electrician
I'd hire it out. I've heard professional core drillers complain about rebar breaking loose and twisting beside the core bit jamming it up when the hole is drilled in just the right spot. I'd bet a bank vault has quite a bit of rebar...

I think they said it'd take them a day to get their bit unstuck sometimes.
 
ptonsparky

ptonsparky

Tom
Location
NE (9.06 miles @5.9 Degrees from Winged Horses)
Occupation
EC - retired
Cow said:
I'd hire it out. I've heard professional core drillers complain about rebar breaking loose and twisting beside the core bit jamming it up when the hole is drilled in just the right spot. I'd bet a bank vault has quite a bit of rebar...

I think they said it'd take them a day to get their bit unstuck sometimes.
Click to expand...

You guys need to look at my location. I will be lucky to have a 2" core drill in the area, if I give them a few days notice.
 
C

Cow

Senior Member
Location
Eastern Oregon
Occupation
Electrician
ptonsparky said:
You guys need to look at my location. I will be lucky to have a 2" core drill in the area, if I give them a few days notice.
Click to expand...

That's a bummer. I didn't know living in Nebraska meant living in the boonies!:D

Do you have much for electrical supply houses around there or do you have to order everything in?
 
Smart $

Smart $

Esteemed Member
Location
Ohio
Cow said:
I'd hire it out. I've heard professional core drillers complain about rebar breaking loose and twisting beside the core bit jamming it up when the hole is drilled in just the right spot. I'd bet a bank vault has quite a bit of rebar...

I think they said it'd take them a day to get their bit unstuck sometimes.
Click to expand...
Hitting rebar can extend the drilling time considerably, even without burning up the bit from excessive pressure, or getting it jammed with loose rebar.

For 18" thick concrete and the likelihood of rebar, probably wise to scope the location prior to drilling... all the more reason to sub it out.
 
mivey

mivey

Senior Member
ptonsparky said:
You guys need to look at my location. I will be lucky to have a 2" core drill in the area, if I give them a few days notice.
Click to expand...
You can always make a trip to rent the correct equipment. It seems to me that it would not be too much different than hiring it done. We found it to be better to rent the expert along with the equipment. Of course, the experts were never more than 2 hours away for us. I'll have to visit NE sometime.
 
kwired

kwired

Electron manager
Location
NE Nebraska
mivey said:
You can always make a trip to rent the correct equipment. It seems to me that it would not be too much different than hiring it done. We found it to be better to rent the expert along with the equipment. Of course, the experts were never more than 2 hours away for us. I'll have to visit NE sometime.
Click to expand...

All the signs along the borders state that Nebraska is "The good life State". There is a little good life for everyone - there are cities and there are boonies, and there are areas in between.
 
B

BJ Conner

Senior Member
Location
97006
Contractors.

Contractors.

There are two nuke plants in Nebraska. Core drilling allways seem to be going on in shutdown work. Somewhere around there are core drilling contractors who can drill thick walls with up to # 18 rebar.
A bank vault would be easy.
 
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