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Thread: Core Drill

  1. #11
    Join Date
    Aug 2007
    Posts
    521
    Quote Originally Posted by Speshulk View Post
    Not sure if this is the right section of the forum, but I'm not seeing anything specifically about tools.

    I'm looking into getting a hand held core drill. A local plumber occasionally lends me his Eibenstock when I need it and I leave him a 20 in the box when I return it to his shop, but I need my own. It works great, but I find that it is a bit tough to get holes lined up neatly with the hand held drill since it walks around some when you initially start drilling the hole. I'm wondering if anyone knows of a hand held drill that has a simple wall mount guide attachment.
    We use a long hammer drill bit that is the same size or a little smaller than the pilot bit on the core hole drill and drill it all the way through the wall before we use the core drill. If you take the time to set a torpedo level and a framing square (on the bit), the pilot hole will be level and square. Once the pilot hole is established, the core drill pilot bit just follows the pilot hole all the way through. When you get close to the other side of the wall stop and start drilling from the other side of the wall. This will will eliminate any blowout of the concrete or block.

  2. #12
    Join Date
    Nov 2014
    Location
    MA
    Posts
    106
    Core Bore makes a nice hand held unit, its wet drilling though. They are a much cleaner hole than the dry hammer bits

  3. #13
    Join Date
    Mar 2007
    Location
    Valdosta, GA
    Posts
    3,588
    Quote Originally Posted by Fulthrotl View Post
    rebar is the kiss of death for them. i needed a couple holes,
    but if you really need holes, a wet drill is really what needs
    to happen. .
    I had to drill about 10 holes through a 24" deck a few years ago .... rebar every 4". Dear god the hole saws we went through...... drilled it wet though. Took two days.

    Built a drive-thru for McD's on top of a parking deck that was street level at the front and went underground at the back. And then all conduit on bottom of the desk and penetrated back up into the store.

    College town Tallahassee at the corner of FSU....... st Patrick's day..... parking garage full of piss and puke. Good times.


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  4. #14
    Join Date
    Jan 2017
    Location
    North SF Bay Area, CA
    Posts
    39
    Quote Originally Posted by brantmacga View Post
    I had to drill about 10 holes through a 24" deck a few years ago .... rebar every 4". Dear god the hole saws we went through...... drilled it wet though. Took two days.

    Built a drive-thru for McD's on top of a parking deck that was street level at the front and went underground at the back. And then all conduit on bottom of the desk and penetrated back up into the store.

    College town Tallahassee at the corner of FSU....... st Patrick's day..... parking garage full of piss and puke. Good times.


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    <shudders> Blah, a lot of the parking structures out here are pre/post tension slabbed and have to be X-ray'd before drilling, whole area is cleared, "ain't cheap"

  5. #15
    Join Date
    Apr 2007
    Location
    Huntington Beach, CA (19 Hrs. 22 Min. from Winged Horses)
    Posts
    5,451
    Quote Originally Posted by ShockedMonkey View Post
    <shudders> Blah, a lot of the parking structures out here are pre/post tension slabbed and have to be X-ray'd before drilling, whole area is cleared, "ain't cheap"
    try plan "b".... breaking a post tension cable on the fifth floor of a hotel across
    from john wayne airport. it shot out the side of the building, and poked a hole
    in the glass side of the building next to it. imagine a .30-'06 going off in a small
    room next to you. that's what it sounds like. no doubt that something important
    had happened. and the curves in the cable blow out concrete a few inches wide,
    and 4' long.

    x rays are better.... this one, they cut the cable off flush, and then cut the
    loops that blew out of the deck.. there were arches of cable bulging out everywhere.

    i apologized, and said i was sorry....
    ~New signature under construction.~
    ~~~~Please excuse the mess.~~~~

  6. #16
    Join Date
    Mar 2007
    Location
    Valdosta, GA
    Posts
    3,588
    Quote Originally Posted by Fulthrotl View Post
    try plan "b".... breaking a post tension cable on the fifth floor of a hotel across
    from john wayne airport. it shot out the side of the building, and poked a hole
    in the glass side of the building next to it. imagine a .30-'06 going off in a small
    room next to you. that's what it sounds like. no doubt that something important
    had happened. and the curves in the cable blow out concrete a few inches wide,
    and 4' long.

    x rays are better.... this one, they cut the cable off flush, and then cut the
    loops that blew out of the deck.. there were arches of cable bulging out everywhere.

    i apologized, and said i was sorry....
    [✔️] Rekt
    [ ] Not Rekt


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  7. #17
    Join Date
    Nov 2014
    Location
    MA
    Posts
    106
    I just did 12 holes in a building, all 2", rebar in every hole. I did it with a core bor and diamond bit. It took almost 3 hours to do them all. It's much better than the hammer drill and so much quieter, less abuse on the body too.

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