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Drill Spyhole - Help!

Discussion in 'Windows and Doors' started by IMPEX, 15 May 2011.

  1. IMPEX

    IMPEX

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    Hi

    Can anyone advise how best to drill a 32mm hole for a bigger spyhole/camera into a composite door where a 14mm hole already exists for the existing spyhole? I am thinking a spade bit is no good as there is nothing for it to 'bite' into. Any ideas appreciated.

    Regards

    Asgar
     
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  3. Alarm

    Alarm

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    32mm hole saw carefully placed, with a slightly smaller pilot bit is one way.
     
  4. IMPEX

    IMPEX

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    Ok, thanks, bit will the hole saw type not damage the exterior of the door? Is there any other way please?
     
  5. Alarm

    Alarm

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    Slow cut from outside, pilot protrudes inside. Now drill from inside, should be no damage.

    Padsaw, damage for sure.
    A lot of small holes, untidy and damage.


    How was the hole cut in the first place?
     
  6. crank39

    crank39

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    Drill a 32mm hole in a scrap bit of ply, clamp this over the exsisting hole obviously centralising it and use it as a guide for your 32mm bit, once its started you could remove the ply, do this on both sides to eliminate blow out. This is how i would do it.
     
  7. Charnwood

    Charnwood

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    Surely the 14mm hole would act as a pilot hole for a spade bit?
     
  8. Alarm

    Alarm

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    Tip of a 32mm spade is not 14mm.
    Think about it.
     
  9. Charnwood

    Charnwood

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    I have done, but can't see a problem. Care to enlighten me, please.
    I know the tip is only about 10mm at its widest point.
     
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  11. crank39

    crank39

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    Well think about it a bit longer then :D
     
  12. tinytom

    tinytom

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    think cranks answer will be best, because holesaws, flat bits and augers need a center point to start from, otherwise they will make a real mess of the material :)
    hope this helps

    tom
     
  13. Alarm

    Alarm

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    Why I said a hole saw with a smaller pilot bit.
     
  14. orchard222

    orchard222

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    What ever you do be very careful, composite chips very easy when drilling holes in the door slab. Not a problem if you have cnc router tho!
     
  15. Charnwood

    Charnwood

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    I have done and still can't see it.

    I am an amateur. Does it show? ;)
     
  16. Aulus

    Aulus

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    Personally, I would glue in a piece of 14mm dowel, then when set, drill with spade bit.
     
  17. DIYnot Local

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