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Cutting a larger tap hole in composite sink?

Discussion in 'Plumbing and Central Heating' started by devs, 12 Sep 2019.

  1. devs

    devs

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    Hi guys I’ve bought a Composite sink that’s already had a tap hole drilled can you share any tips on how to increase the hole size? Many thanks
     
  2. Newboy

    Newboy

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    Cut a piece of ply or MDF with the hole size required.

    Carefully clamp the cut piece over the hole position and use the piece to guide a holesaw to cut the required tap hole.
     
  3. devs

    devs

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    Perfect thanks for the help mate! But without sounding too much of a novice how clamp this, wouldn’t it get in the way of the hole saw?

    Cheers
     
  4. devs

    devs

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    Scrap that!! I’ve just woke up and understand thanks again
     
  5. Harry Bloomfield

    Harry Bloomfield

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    A suitably sized step drill would obviate the need for ply or MDF, assuming the hole is in the correct position, but just the size needs increasing.
     
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  6. devs

    devs

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    Thank you, I’ll check them out!
     
  7. Harry Bloomfield

    Harry Bloomfield

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    You can buy a cone drill, which has a steady taper, to enlarge holes, but on thick material they leave a cone shaped hole.

    A step drill, is similar to a cone, but has a series of stepped sizes. Aldi/Lidl sometimes have a set of three sizes of drill on offer, in a case, for not a lot of money.
     
  8. reds42

    reds42

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    Another way of guiding a bigger hole saw through an existing hole is to stack two cutters together.

    Put the larger hole saw on the arbor first, then screw on one the same size as the original hole which will act as guide bit.
     
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  9. devs

    devs

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    Nice! Thanks mate
     
  10. dilalio

    dilalio

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    This tip has saved me lots of times :D
     
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  11. Keithmac

    Keithmac

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    Excellent idea, I'll have to remember that one!.
     
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