Cutting for atmos speakers

Discussion in 'Home Cinema Building DIY' started by Navvie, Oct 25, 2017.

  1. Navvie

    Navvie
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    I need to cut some 244mm circular holes in my ceiling for atmos speakers, what's the preferred method?
     
  2. Peter Parker

    Peter Parker
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    One way is to mark the circle on the ceiling, drill a hole and then use a pad saw.
     
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  3. ufo550

    ufo550
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    If it's just plasterboard, I would just use a pad/jab saw. If you really wanna go technical, get Dremmel or something similar.
     
  4. SparkerB

    SparkerB
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    I did mine with a 1inch wide dremmel.. main thing was making sure I didn't cut into any electric cables. Ideally they should be pinned to the joists, some of mine wasn't so I marked the blade too avoid going too deep. Also ensure there are no joists interfering with your speaker location, that happened to me.. I was not happy!
     
  5. Russa

    Russa
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  6. ufo550

    ufo550
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    ^^^

    I got one of those, its in me garage, and its staying there ;)
     
  7. ufo550

    ufo550
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    ^^^

    That's in the garage as well :D
     
  8. Plasma Dan

    Plasma Dan
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    I've done this using a jigsaw with a coarse blade a few times. It's neater & quicker than using a pad saw.

    IMAG0838.jpg

    IMAG0997.jpg

    Dan.
     
  9. ufo550

    ufo550
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    On the other side of things, I cut an access hole in some chipboard flooring with a hole saw, top of landing up against the wall.
    This is what I found after cutting the hole;
    [​IMG]

    Luckily I was rather careful when cutting the hole, and didn't damage the gas pipe. The markings were made by me after the fact.

    So Navvie, I'd be careful using a marauding jig saw, unless you know what's above the ceiling
     
  10. Navvie

    Navvie
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  11. Navvie

    Navvie
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    That was close...

    I put the ceiling up earlier in the year. There's not even rockwool above the bit where I plan on cutting.
     
  12. Plasma Dan

    Plasma Dan
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    You can chop down a jigsaw blade so it doesn't cut through anything deeper than the plasterboard, done that a few times to avoid damaing cables that I knew were there. Or just make a smaller hole first so you can see what's there.

    Dan.
     
  13. ufo550

    ufo550
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    As said I've used such devices, they are imprecise; both cutting blades have to be position precisely, which is difficult to achieve and when cutting such large holes in plasterboard, the centre pilot hole enlarges as the cut progresses, so you end up with a mess.

    If you've only a few holes to cut, and haven't a power tool, I would just use a pad saw.
     
  14. Russa

    Russa
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    Fantastic tool, my electrian told me about them years ago.

    He installs a lot of av builds.
     
  15. Navvie

    Navvie
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    I bought an adjustable hole cutter, made a few trial holes on some plasterboard off cuts. Now, I'm a dab hand with a hole saw but this... what a mess. I'm sure the smaller (200mm) cutter with the hood is better as it would help you keep the drill at 90 degrees, without the hood it's very difficult to do this.

    I ended up doing as @Plasma Dan suggested, cut my jigsaw blade just long enough to cut through the boards but nothing else, cut a slightly smaller hole than required and used a coping saw to follow my marked outlines.
     

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