Author Topic: Core Bits?  (Read 6283 times)

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Offline fdengel

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Core Bits?
« on: September 30, 2011, 07:21 PM »
This is probably in the wrong section, and rather off-the-wall unrelated to the forum, but I'm hoping someone here might be able to help me find something...

I'm in the USA, trying to find a core bit suitable for a 1.5" pipe.  I need to go through slightly less than 4" of brick.

I'm looking for one I can use with an SDS Plus rotary hammer, but I'm having trouble pinning down what pieces I need or possibly even finding a place that sells these.

I see smaller ones, larger ones, etc., but nothing in the 1-5/8"-1-3/4" range that I can find a way to adapt to SDS Plus, except for one bit that doesn't have enough reach (only 3" or something like that).


I've never used a core bit before, so I'm hoping someone with more experience might be able to point me in the right direction?

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Offline Holzhacker

  • Posts: 926
    • www.aic-chicago.com
Re: Core Bits?
« Reply #1 on: September 30, 2011, 07:33 PM »
Not sure a core bit is your best option. I have a large Bosch SDS demo/drill hammer. I use core bits for 3" and 4" pipe. For smaller pipe I use regular large SDS twist drill bits. They work fine, never had a problem. They have all lasted a long time through brick and concrete. All of my bits are at least 12", some are Bosch, some are ?. I'd have to go look. MSC on Belmont and N.Turek are where I buy these types of bits here in Chicago.
NOTE - If you are going through face brick and have an issue with needing a super clean rim on the hole. Try this ... go to a tile store and buy a carbide hole saw, 1 3/4" or 1 7/8" are fairly common depending on where you go. Cut the face first and then drill the hole. I've only done it a couple times when I knew the client would be super picky. Most of the time it just isn't necessary. Put the SDS on drill first and then hammer drill after getting in a bit.
Hope that helps, Markus
"The Code is not a ceiling to reach but a floor to work up from"

Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #2 on: September 30, 2011, 07:44 PM »
Not sure a core bit is your best option. I have a large Bosch SDS demo/drill hammer. I use core bits for 3" and 4" pipe. For smaller pipe I use regular large SDS twist drill bits. They work fine, never had a problem. They have all lasted a long time through brick and concrete. All of my bits are at least 12", some are Bosch, some are ?. I'd have to go look. MSC on Belmont and N.Turek are where I buy these types of bits here in Chicago.
NOTE - If you are going through face brick and have an issue with needing a super clean rim on the hole. Try this ... go to a tile store and buy a carbide hole saw, 1 3/4" or 1 7/8" are fairly common depending on where you go. Cut the face first and then drill the hole. I've only done it a couple times when I knew the client would be super picky. Most of the time it just isn't necessary. Put the SDS on drill first and then hammer drill after getting in a bit.
Hope that helps, Markus

My rotary hammer can only handle a 1" "normal" bit; 1-3/4" is too large...

Offline mastercabman

  • Posts: 1854
  • NORFOLK,VA
Re: Core Bits?
« Reply #3 on: September 30, 2011, 08:08 PM »
You can also try HILTI
I don't understand!?! I keep cutting it,and it's still too short!

Offline Alan m

  • Posts: 3312
Re: Core Bits?
« Reply #4 on: September 30, 2011, 08:46 PM »
i wouldnt reconmend a core bit because there isnt enough room on that small a size bit for enough teeth. i would reconmend a contraform fit. they are a fit like a auger bit with a ring od teeth on the front. i have drilled through over 12 inchs of concrete etc with these and it will eat its way through. the core bit is very slow and over heats very quickly.
if the pipe is a plumbing pipe go to a big plumbing holesaler that sells to builders they will sort you out
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)

Offline Ken Nagrod

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Re: Core Bits?
« Reply #5 on: September 30, 2011, 10:27 PM »
Save your money and rent a diamond coring bit and if necessary, a drill for it.  Clean hole without damage, no hammering action, just rotary.

Also, you didn't say what kind of pipe, so we don't know the actual hole diameter and the kind of pipe would also tell whether your 1 1/2" is ID or OD.

You might just have to rent a core bit SDS Max and the hammer drill instead.


If you're planning on using the typical schedule 40 PVC, then a 1 1/2" pipe has an OD of approx. 1 7/8", but I would always give a little bit of room that you silicone around, so a 2" hole gives you 1/16" all the way around.
« Last Edit: October 01, 2011, 12:05 AM by Ken Nagrod »

Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #6 on: October 01, 2011, 07:51 AM »
I believe it will be PVC.  It's for water evac from a battery-backed sump pump sharing a sump well with an electric one.

We will be doing two of these, though I'm not sure where the second one will be exiting the building at yet.

Wasn't thinking about ID vs. OD, just assumed it was OD, so if that is the case, will need a 2" bit instead...

I'll check on that.


I hate renting for some reason -- never knew why, just always have.  I'd really prefer to avoid getting another major tool, but it needs to be done, so if that's what it takes...


Alan m, I never heard of a "contraform fit" -- I tried to google that (and "bit") and mostly found hits on dancing and such, then added "masonry" and am still not learning much... any links on that, or some other term to search on?


Thank you!

Offline Alan m

  • Posts: 3312
Re: Core Bits?
« Reply #7 on: October 01, 2011, 08:01 AM »
I believe it will be PVC.  It's for water evac from a battery-backed sump pump sharing a sump well with an electric one.

We will be doing two of these, though I'm not sure where the second one will be exiting the building at yet.

Wasn't thinking about ID vs. OD, just assumed it was OD, so if that is the case, will need a 2" bit instead...

I'll check on that.


I hate renting for some reason -- never knew why, just always have.  I'd really prefer to avoid getting another major tool, but it needs to be done, so if that's what it takes...


Alan m, I never heard of a "contraform fit" -- I tried to google that (and "bit") and mostly found hits on dancing and such, then added "masonry" and am still not learning much... any links on that, or some other term to search on?


Thank you!

sorry about that. maybe the name is lost in translation across the pond. thats what its called here , that doesnt mean thats its proper name. basically its just a like a big auger rather than the core bit like a hole saw
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)

Offline mastercabman

  • Posts: 1854
  • NORFOLK,VA
Re: Core Bits?
« Reply #8 on: October 01, 2011, 08:54 AM »
I believe it will be PVC.  It's for water evac from a battery-backed sump pump sharing a sump well with an electric one.

We will be doing two of these, though I'm not sure where the second one will be exiting the building at yet.

Wasn't thinking about ID vs. OD, just assumed it was OD, so if that is the case, will need a 2" bit instead...

I'll check on that.


I hate renting for some reason -- never knew why, just always have.  I'd really prefer to avoid getting another major tool, but it needs to be done, so if that's what it takes...


Alan m, I never heard of a "contraform fit" -- I tried to google that (and "bit") and mostly found hits on dancing and such, then added "masonry" and am still not learning much... any links on that, or some other term to search on?


Thank you!

sorry about that. maybe the name is lost in translation across the pond. thats what its called here , that doesnt mean thats its proper name. basically its just a like a big auger rather than the core bit like a hole saw
I think what he means is a solid drill bit usualy in SDS MAX (large rotary hammer)But if you need to drill a large hole,you are going to need a rotary hammer that can handle it.
You may also check your local codes but here you can't just run a pipe thru a brick wall without a sleeve.You can use a short larger pvc pipe so that the 1.5" can go inside of it.
I don't understand!?! I keep cutting it,and it's still too short!

Offline tjbnwi

  • Posts: 6116
  • Cedar Tucky Indiana
Re: Core Bits?
« Reply #9 on: October 01, 2011, 09:01 AM »
If you end up using a twist bit and are concerned about the edge of the hole, use a smaller diameter bit and drill through the wall. Clear the surface of the inside wall with the larger bit. Drill through the wall from the out side.

Silicone an escutcheon in place to cove the edge of the hole. I have seen them in PVC to match the pipe.

http://www.plumbingsupply.com/escutch.html

Tom

Offline neth27

  • Posts: 574
Re: Core Bits?
« Reply #10 on: October 01, 2011, 12:47 PM »
Can't you use this type? http://m.screwfix.com/details.htm?id=45971.
I'm sure you can get them over there..

John

Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #11 on: October 01, 2011, 04:54 PM »
Can't you use this type? http://m.screwfix.com/details.htm?id=45971.
I'm sure you can get them over there..

John

Only seeing metric sizes, which I could probably deal with if I could find one that was close enough to what I'm looking for -- about 51mm...  except I don't see specs on how deep they can cut, and I don't see any US dealers.

I found two potential hits on eBay, waiting for responses from the sellers to see if they will work for me.

If all else fails, I'll just end up needing to get one of the bigger tools.

Crazy.

Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #12 on: October 01, 2011, 04:55 PM »
If you end up using a twist bit and are concerned about the edge of the hole, use a smaller diameter bit and drill through the wall. Clear the surface of the inside wall with the larger bit. Drill through the wall from the out side.

Silicone an escutcheon in place to cove the edge of the hole. I have seen them in PVC to match the pipe.

http://www.plumbingsupply.com/escutch.html

Tom


I don't think we're too worried about that.  The brick is on the outside, and on the inside it will be in an unfinished basement.

More concerned about the water seal than about the overall appearance.


Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #13 on: October 01, 2011, 04:58 PM »
I think what he means is a solid drill bit usualy in SDS MAX (large rotary hammer)But if you need to drill a large hole,you are going to need a rotary hammer that can handle it.
You may also check your local codes but here you can't just run a pipe thru a brick wall without a sleeve.You can use a short larger pvc pipe so that the 1.5" can go inside of it.

Ok, yeah I know about those, have plenty of the smaller ones...

I don't see any remotely affordable RH's that can handle one that size.


The sleeve is an interesting point; none of the others seem to have that from what I can tell, but I know enough to know that doesn't mean they are not supposed to... will need to check on that; I've never heard of it until today.

Thank you!

Offline tjbnwi

  • Posts: 6116
  • Cedar Tucky Indiana
Re: Core Bits?
« Reply #14 on: October 01, 2011, 10:10 PM »
By using an esctucthion you can chalk around the pipe, fill the recess of the escutcheon with chalk slide it over the pipe and press it to the wall. Creates a very good seal and cleans up the look of the hole.

Tom

Offline Ken Nagrod

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Re: Core Bits?
« Reply #15 on: October 01, 2011, 10:14 PM »
You want a little room around the pipe for natural movement in the structure.  That's why I've always used silicone to seal around pipe penetrations.

Offline fdengel

  • Posts: 854
Re: Core Bits?
« Reply #16 on: October 05, 2011, 09:24 AM »
I think I may have found a solution as far as the bit(s); find out when they arrive and I get to try them out.

Meanwhile, I'm glad I asked, because some interesting points were raised here that I hadn't thought of myself ahead of time.

We're looking into whether or not a sleeve is needed.


Thank you for all of the help!