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    pastor1189's Avatar
    pastor1189 Posts: 1,538, Reputation: 3
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    #1

    Feb 23, 2013, 11:30 AM
    Core Drill Bit
    Friend has to drill a hole in cement block. About 2" wide. Has a lot of masonry
    drill bits and a hammer drill maybe the largest one drill bit is perhaps 1" wide and is long enough . But he would have to make two separate holes. If the core bits were not so expensive he could probably use that.. Is there a way to make the hole bigger to 2" wide? Or must he drill two separate holes?
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Feb 23, 2013, 11:56 AM
    Have you tried an equipment rental place... I know the ones local to me have them. You don't need to buy something you will use once.
    smearcase's Avatar
    smearcase Posts: 2,392, Reputation: 316
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    #3

    Feb 23, 2013, 12:03 PM
    I just did one through foundation block using a hammer drill and 1/2 inch masonry bit (drilling from inside) to accurately locate the center from outside. Then used a variable speed hammer drill with a flat bit from outside to enlarge the hole. A large core bit would probably still cause overbreakage where it exits outside. Once the small hole is accurately located outside, enlarging it gradually even with a hammer and chisel is relatively easy.
    pastor1189's Avatar
    pastor1189 Posts: 1,538, Reputation: 3
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    #4

    Feb 23, 2013, 12:05 PM
    Very good thanks
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #5

    Feb 23, 2013, 01:15 PM
    Use a smaller drill and make a circle of small holes. Then knock out the center. Make sure you are in a space not the web.
    pastor1189's Avatar
    pastor1189 Posts: 1,538, Reputation: 3
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    #6

    Feb 23, 2013, 01:28 PM
    Okay

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