1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

152mm Core Drill - Blunt?

Discussion in 'Plumbing and Central Heating' started by eveares, 18 Jul 2017.

  1. eveares

    eveares

    Joined:
    28 Jul 2012
    Messages:
    1,305
    Thanks Received:
    46
    Location:
    Surrey
    Country:
    United Kingdom
    Just bought this off ebay for £35 inc P&P (Included hex arbour kit not shown) as I need to drill a 6"/150mm hole through a wall for a short piece of 6"/150mm (External diameter 156mm) solid ducting what is to be used as a exhaust outlet for a portable AC Unit.



    Now the brand is SilverLine and the box says it is "diamond core", however the amount of effort to get through a bit of 6mm plywood as test for the hole size was unbelievable!

    Is this because the core drill is blunt and a knock off OR just because the plywood was to soft to grind away at?

    The wall I am am hopefully going to be drilling through tomorrow is breeze block with insulated plasterboard on the inside and smooth render on the outside. Using my 18V Dewalt cordless drill.

    Regards: Elliott
     
  2. Sponsored Links
  3. Can't see that clearly, but it doesn't look as though there aren't many diamonds in it. Silverline are normally cheap, but basically okay, so I think you've got a knock off there.

    Having said that, I'm not surprised you can't get through the plywood; too soft to be ground away. Wait to see what happens on the breeze block.
     
  4. sbgasman

    sbgasman

    Joined:
    7 Apr 2008
    Messages:
    1,585
    Thanks Received:
    706
    Location:
    Yorkshire
    Country:
    United Kingdom
    it is not designed for wood,your 18v battery drill is not powerful enough.
     
  5. Roger928

    Roger928

    Joined:
    10 Aug 2016
    Messages:
    2,631
    Thanks Received:
    201
    Country:
    United Kingdom
    You would be better off hiring a rig.
    You'll realise that when you've burnt out the cordless. You can sell the core on ebay.
     
  6. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,651
    Thanks Received:
    9,075
    Location:
    Lanarkshire
    Country:
    United Kingdom
    it wont cut through ply wood and you need a core drill not a cordless
     
    • Like Like x 1
  7. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    8,036
    Thanks Received:
    2,274
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    A dry diamond corer won't cut wood for toffee, too smooth a surface. A diamond core needs a hard surface to keep the diamonds in the segments exposed, all the wood will do is create too much heat and polish the surface.
    You may need to chap those segments up, looks like they have become smooth and the diamonds need to be exposed again. Cold chisel, and chap light marks into the segments if you find it won't bite, or a senior hacksaw and roughen them up.
    If the corer jams then you may break your thumb/wrist, you need a clutched drill, not a cordless!!
     
    • Like Like x 2
  8. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    13,203
    Thanks Received:
    3,018
    Location:
    Daventry
    Country:
    United Kingdom
    You'll ruin your drill if you're trying to do it with a cordless. You need a proper mains powered core drill with a clutch.
     
    • Like Like x 2
  9. Happyplumber

    Happyplumber

    Joined:
    9 Feb 2009
    Messages:
    4,237
    Thanks Received:
    1,008
    Location:
    Berkshire
    Country:
    United Kingdom
    Use a jigsaw and cut the hole if you need a guide
    The core drill is made for cutting through Brick,block and wilm definetly struggle through wood and also steel !!
     
  10. Sponsored Links
  11. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,651
    Thanks Received:
    9,075
    Location:
    Lanarkshire
    Country:
    United Kingdom
    when you are cutting through a timber kit house you go through plaster board, and the insulation then hit the Ply, it takes ages and takes the life out of the core until it gets to the block or brick then it can do what it was designed to do.
     
  12. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    7,746
    Thanks Received:
    1,244
    Location:
    Potters Bar
    Country:
    United Kingdom
    Use a hole saw first. Then the diamond core. Starrett are good.
     
  13. flameport

    flameport

    Joined:
    10 Mar 2007
    Messages:
    9,798
    Thanks Received:
    1,953
    Location:
    Poole, Dorset
    Country:
    United Kingdom
    There's the problem.

    There's another one.

    Give up now before it's too late.
     
    • Thanks Thanks x 1
    • Like Like x 1
  14. yes, I am afraid you are using a questionable quality core with a totally incorrect drill and trying to test it against an unsuitable substrate. apart from that what could possibly go wrong?
     
  15. Come on guys,give the poor guy a break. He's learnt not to try a core drill on ply, so he'll know better next time. He's only going into breeze block, so as long as it's not a £30 Lidl cordless drill, it may well cope, and there's only 20mm of render at the end so it might well survive. At the end of it, if the drill burns out, he'll know to get a better drill next time, so it'll have been a good learning curve all round for him.

    There are some questions you just shouldn't ask.
     
    Last edited by a moderator: 22 Jul 2017
    • Like Like x 1
  16. a 152mm core hmmm!
     
  17. PullerGas

    PullerGas

    Joined:
    11 Jul 2015
    Messages:
    6,062
    Thanks Received:
    1,205
    Location:
    Glasgow
    Country:
    United Kingdom
    This made me laff; the thought that someone could clone a 'Silverline' product!! Now, that would be scraping the barrel....:D
     
    • Like Like x 1
Loading...

Share This Page