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  1. #1
    Join Date
    Sep 2007
    Location
    Sydney
    Posts
    43

    Default Best way to cut 100mm hole in besser block?

    Hi guys,

    I need to cut a 100mm hole in besser block to run a pvc tube through. I need a neat hole and once pvc tube is through, I'll need to seal it (that is between block and tube).

    Can anyone please advise me what's the best way to do this and what tools "ill require?

    Thanks,

    Julie

  2. #2
    Join Date
    Feb 2007
    Location
    Sydney
    Posts
    6

    Default

    Best looking hole will be made with a 'core drill'

    Expensive option for just one usage though.

    Do you know someone who installs air-conditioning? A lot of them have core drills ranging in size from 60/70mm up to 100mm

    Otherwise you could do a messy hole & fit a skirt around the pipe to hide it.

  3. #3
    Join Date
    Jun 2007
    Location
    Perth, WA
    Posts
    67

  4. #4
    Join Date
    Jul 2003
    Location
    On the Downs, Darling SEQld
    Posts
    420

    Default

    If you can,
    go bigger than the 100mm.

    Cut a section of the 100mm Pipe, about 250mm or 350mm long;
    depending on Block Width;
    slit it,
    and open it up and slip it over the Main Pipe where the Pipe goes through the Block.

    Seal around the Sleeve.
    Navvi

  5. #5
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    I cut a 100mm hole through a block wall so i could put my dust extractor outside.

    I just drilled a series of holes around the perimeter and knocked the centre out.
    I smoothed the hole up for a neat fit with a cold chisel & hammer. (tapping the chisel - not belting it hard)

    The whole job only took an hour or so
    Regards, Bob Thomas

    www.wombatsawmill.com

  6. #6
    Join Date
    Oct 2003
    Location
    Kentucky NSW near Tamworth, Australia
    Age
    86
    Posts
    1,067

    Default

    Quote Originally Posted by memphis View Post
    That would be great at a reasonable price but you would want a decent drill to drive it and you would really want to hang on if it grabbed. You would want a drill with a clutch in it like the old 1/2" Blue Bosch that I have.

  7. #7
    Join Date
    May 2007
    Location
    Bundoora, Melbourne
    Posts
    197

    Default

    As echidna said. There was a thread on this a few weeks back, but into house bricks, same applies.
    Just trace you pvc piece onto the block and put a masonry bit around the perimeter as close as possible without it dropping into the hole you've just drilled.
    Planned Landscape Constructions
    www.plannedlandscape.com.au

  8. #8
    Join Date
    Aug 2004
    Location
    sydney
    Posts
    62

    Default

    can you take your block somewhere?
    There's a mob that do core drilling and concrete sawing in sydney (diacore I think they were called) - I was looking at getting some blocks core drilled to install lights.

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