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  1. #1
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305

    Hand held Core drilling

    Hey guys and gals,

    I have owned a Bosch hammer drill for about 15 years, I have a 5" core that is worn but still drilling, a 4" and a 2", and smaller stuff.

    I have a new employee that says he used to work at a company where they used the dry coring system...I believe I saw full page ads in one of the trade mags.

    Any how, what is the best way now to drill holes? I guess my biggest needs is 3" plastic, but once in a blue moon I would drill a 4" ABS pipe as well (not so much plumbing anymore).

    Does anyone here actually own a 'bolt on' core drilling machine?


    Thanks for the help! gary

  2. #2
    Join Date
    May 2006
    Location
    Cumbria (England)
    Posts
    17
    We dry core all holes bigger than 22mm. But, and I say but it can be a real pain in the butt. If the wall is dry and the brick is good we have no problem, like a knife through butter. Hit a damp patch and it sticks like mad as the damp dust jams the bit. Cobbles, pebbles, slate or anything loose dont even bother as it just rips the teeth clean off the core and they aint cheap. If its a pain we just hire a wet core drill but only good if you can make a mess. We alse have this red brick which is like cutting a dimond, it just burns the teeth off the core. So basically dry core is olny good for concrete, and good brick. Good thing is if you hit a steel rod or even a metal lintal the dimond core will usually just cut through it too is you hit it right.

  3. #3
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305

    tools

    So, is it better than my rotary hammer??

    There's no 'hammer" on the one you're describing right?

    Is there a name brand you like?

    gary

  4. #4
    Join Date
    May 2006
    Location
    Cumbria (England)
    Posts
    17
    No theres no hammer action used. We have a Dewalt diamond core drill but there not cheap. We dont buy and particular brand of core but dont buy cheap ones as there arnt as many diamond in the tups so they dont cut as well. I have never used a hammer drill for cutting holes 1" and bigger. The companies I have worked for always use diamond core. Why dont you hire one for your next install and try it and see how it feels before you buy one. We just hold a hover up when were drilling to keep the dust down. I cant imagine the hammer core drill you use doesnt stick in damp walls but for dry solid walls you wont beat a dry core for speed and cleaness of cut.

  5. #5
    Join Date
    Mar 2003
    Posts
    7,321
    I own both the dry core rig, and a wet core rig. For anything from one to four inch my guys love the dry core rig. We have a kit that a local supplier made up consists of one to four inch bits, extensions, drill motor all tucked into a neat canvas carry bag. You need to know that to start a hole, you cannot put the bit flush on the surface, but rather at an angle to starta small spot, then walk it up to hit the entire hole. Have had nothing but good luck in what we use it for. The wet machine can be cumbersome but worthwhile as well.

  6. #6
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305
    Quote Originally Posted by flange View Post
    I own both the dry core rig, and a wet core rig. For anything from one to four inch my guys love the dry core rig. We have a kit that a local supplier made up consists of one to four inch bits, extensions, drill motor all tucked into a neat canvas carry bag. You need to know that to start a hole, you cannot put the bit flush on the surface, but rather at an angle to starta small spot, then walk it up to hit the entire hole. Have had nothing but good luck in what we use it for. The wet machine can be cumbersome but worthwhile as well.
    cool, can I get a name and number for your supplier?

  7. #7
    Join Date
    Jun 2008
    Location
    NH + VT
    Posts
    27
    Quote Originally Posted by flange View Post
    I own both the dry core rig, and a wet core rig. For anything from one to four inch my guys love the dry core rig.
    Same here. The guys love the dry core. It makes a much nicer hole than a hammer. Clean and fast.
    "Luck is what happens when preperation meets opportunity."

    Lucius Annaeus Seneca

  8. #8
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305
    Quote Originally Posted by richelli View Post
    No theres no hammer action used. We have a Dewalt diamond core drill but there not cheap. We dont buy and particular brand of core but dont buy cheap ones as there arnt as many diamond in the tups so they dont cut as well. I have never used a hammer drill for cutting holes 1" and bigger. The companies I have worked for always use diamond core. Why dont you hire one for your next install and try it and see how it feels before you buy one. We just hold a hover up when were drilling to keep the dust down. I cant imagine the hammer core drill you use doesnt stick in damp walls but for dry solid walls you wont beat a dry core for speed and cleaness of cut.
    I've drilled dozens of 5" holes with the hammer. It takes about 30 minutes with an 8" wall.

    How long does the dry core take for a 4"?

  9. #9
    Join Date
    Apr 2008
    Location
    Florida
    Posts
    33

    angle grinder

    I pull out my makita angle grinder and make a 5" hole in a wall in less than a minute
    *most walls are block so this works most time
    sometimes i do need grandpapies long masonry bit
    *personal tip
    whenever using any diamond bit always keep it cool always dip it in water now and then will make the job go by 10 times faster and your bit will last 15 times longer

  10. #10
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305
    I'm not understanding, are you serious?

  11. #11
    Join Date
    Apr 2008
    Location
    Florida
    Posts
    33

    yep

    angle grinder and a diamond core bit can be used wet/dry special bit
    the fastest for me

  12. #12
    Join Date
    Feb 2005
    Location
    Massachusetts
    Posts
    305
    how big of a hole with your angle grinder? Is this a big grinder or a small one?

  13. #13
    Join Date
    Apr 2008
    Location
    Florida
    Posts
    33

    size

    small makita variable speed ive done 4-5" holes but it goes through fast

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