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Old 02-25-2019, 08:26 PM   #1
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Default Hitting Rebar When Drilling

What if you were drilling about a 1" hole in concrete and hit rebar and can't drill in another place. How do you deal with the piece of rebar to clear the hole?
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Old 02-25-2019, 08:30 PM   #2
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If it's big enough bar that a rebar rated 4 cutter SDS bit won't eat it then we'll go through with a rebar cutter then finish the hole up.
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Old 02-25-2019, 08:40 PM   #3
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One of these,

https://www.grainger.com/product/BOS...r-Cutter-2PPZ5

Get your earplugs ready.
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Old 02-26-2019, 07:00 AM   #4
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back in the day it used to be a problems but now i noticed the hilti drill bits usually eat through the metal.
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Old 02-26-2019, 08:31 AM   #5
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I guess it goes without saying that sometimes you shouldn't be drilling through the rebar (assuming it is in fact rebar), and that the powers that be should approve it in writing in some form or another.
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Old 02-26-2019, 08:58 AM   #6
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Wet coring with a diamond bit. Rebar is mere butter to my wet coring drill....
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Old 02-26-2019, 10:06 AM   #7
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Above 1" I out source the wet coring.

Otherwise, we just do it.

I use roto-hammers for anchors... but through-holes are rare enough to merit wet coring.

Often such penetrations will end up as exposed work. ( landscaping retaining wall )

Consequently, jumping around and re-punching is just not a viable solution.
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Old 02-26-2019, 10:18 AM   #8
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Quote:
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Wet coring with a diamond bit. Rebar is mere butter to my wet coring drill....
Do you normally wet core a hole that small?

I thought they didn't start until 1 1/2".
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Old 02-26-2019, 10:40 AM   #9
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Do you normally wet core a hole that small?

I thought they didn't start until 1 1/2".
I don't do any wet coring these days, unless you consider a ships auger into wet Honsador Lumber treated studs left outside at the yard ...

But I used to almost daily. I'd have to go look to see what the smallest diameter bit I have is. Don't even know any more..
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Old 02-26-2019, 10:46 AM   #10
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My Hilti bits:

1/2" (7/8")

3/4" (1.125")

1" ( 1.5" )

Yeah, it's a puppy. It can handle larger sizes -- but I don't attempt such.

I bought the rig because I grew sick and tired of ^%$# around with SDS-Max and rebar.
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Old 02-26-2019, 10:47 AM   #11
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Anchors are shallow.

So my NIB magnet can detect rebar that would frustrate them.

Yeah, it's intense.
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Old 02-26-2019, 10:49 AM   #12
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BTW, Metabo makes -- by far -- the best roto-hammers.

Especially their SDS+ designs.
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Old 02-26-2019, 11:01 AM   #13
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Quote:
Originally Posted by macmikeman View Post
I don't do any wet coring these days, unless you consider a ships auger into wet Honsador Lumber treated studs left outside at the yard ...

But I used to almost daily. I'd have to go look to see what the smallest diameter bit I have is. Don't even know any more..
Same here for the most part, I sold most all that stuff off before I moved in 09.
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Old 02-26-2019, 11:03 AM   #14
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Quote:
Originally Posted by telsa View Post
My Hilti bits:

1/2" (7/8")

3/4" (1.125")

1" ( 1.5" )

Yeah, it's a puppy. It can handle larger sizes -- but I don't attempt such.

I bought the rig because I grew sick and tired of ^%$# around with SDS-Max and rebar.
So those are core bits?
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Old 02-26-2019, 11:04 AM   #15
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Yes.

The rig is a small version of the Big Ones.

It has a vacuum base, water injection, -- the whole works.

It's scaled for just this purpose.

It's really too small for anything past 2" -- 1.5" trade size.

I never shelled out for that bit. Too expensive.

If I'm punching feeders, then it's 2" trade size on up.

Such holes are very few and very far between for me.

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Old 02-26-2019, 11:06 AM   #16
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Yes.

Interesting, never gave that much thought I guess.

I still have my Hilti core drill but none of the bits or accessories.

[IMG][/IMG]
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Old 02-26-2019, 11:16 AM   #17
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That looks like a Jacobs chuck.

Mine is a DCI chuck. (ancient but reliable)
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Old 02-26-2019, 11:24 AM   #18
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Quote:
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That looks like a Jacobs chuck.

Mine is a DCI chuck. (ancient but reliable)
It is a Jacobs chuck.
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Old 02-26-2019, 03:27 PM   #19
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My other reason for wet coring: Blow Out.

Punching in Wall-Pac lighting fixtures is a lot easier with a light weight wet drill.

I found that I could rig up a chassis (Unistrut) atop the rails of a Big scissor lift (a rental with a suitable gen-set built in) and dial my drill right up to the wall from the interior. It's a big speed up. The Hilti core drills are perfectly dimensioned for this task. Then it's a snap to toss through some MC. A task that was taking all day suddenly was whipped out by morning break.

However, Sacramento is so over-built with shells and warehouse space that I've gone a long time since the last project of this type was put out to bid.

Why is it that, once I have the perfect solution, my market dries up?
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Old 02-26-2019, 09:59 PM   #20
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Quote:
Originally Posted by telsa View Post
BTW, Metabo makes -- by far -- the best roto-hammers.

Especially their SDS+ designs.
I have yet to use a hammer drill better than Hilti, and I’ve used quite a few. Drilling concrete Hilti has the answer and quality bits, and their price reflects the labor saving headaches.
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