Enlarging holes in tank

Discussion in 'General Discussions and Advice' started by dallasg, 4 Feb 2009.

  1. dallasg

    dallasg Moderator MASA Contributor

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    Hi Hennie,

    if my tanks already have holes drilled, 40mm and i want to make them 50mm, can i drill over them with the bigger bit?

    thanks
    Dallas the sandtonian :)
     
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  3. Awvince

    Awvince Here fishie fishie

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    That does not sound safe, but i'll tag along to see if it can be done. :)
     
  4. Tobes

    Tobes Retired Moderator

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    Not sure because a hole saw has a bit in the centre to centralize it. With the hole being 40mm, how you gonna centralize the 50mm saw to keep it from running around? You can always use a small dremmel tool and grind it bigger(which will take forever) or cut it with a thin dremmel tool all around the circumference until you're through (I did this with 12mm glass) - also takes forever :p
    Just remember to use a lot of water on the tool ;)
     
  5. Mike

    Mike Retired Moderator

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    You can clamp a piece of flat timber over the current hole, then drill through the wood and into the glass, the wood keeps the glass cutter from slipping - do it slowly and keep wet, it will be fine.

    P.s. - i tried with a dremel, it took bloody ages. :(
     
  6. Tobes

    Tobes Retired Moderator

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    Great idea Mike - done something simular before but with steel - not glass, why I didn't think about it now is beyond me. Took me 6 hours with a dremmel on 12mm glass (was also playing with the wife inbetween as she sprayed the water :whistling:)
     
  7. Mike

    Mike Retired Moderator

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    I'd love to take the credit, but it is a fellow reefer that showed me how to do it:)
     
  8. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    hahaha :)

    thanks mike, will do that
     
  9. Pete

    Pete

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    The glass drill bit does not have the centre drill piece in it...Do what mike has suggested just go realy slow and dont rush it
     
  10. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cool thanks, going to be fun moving a 150kg tank to drill it
     
  11. Reef Maniac

    Reef Maniac MASA Contributor

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    Yup, I agree

    Of course, the safest bet would be to do the drilling using a drill press, to prevent the drill from "wandering" off centre, but with a really steady hand you just might be lucky...

    Hennie
     
  12. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cant move the tanks, so will have to see if i can modify a router to drill and use its big base to steady the drill
     
  13. Shaun

    Shaun Retired Moderator

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    You can also drill a hole in a old piece of glass and then use dbl sided tape to hold it in place while you drill.
     
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  14. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    ok just to recap, i need to drill 20mm and 50mm holes my tanks.
    can i drill in the base say 5cm from the edge?
    i have made hole templates for enlarging the holes, going to use diamond hole saws, to keep them from wondering sound ok?

    now my worry is that these can weaken the tank, but if i add a square piece over the hole like this, courtesy of punk

    [​IMG]
     
  15. Mike

    Mike Retired Moderator

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    %cms from the edge is ok, just don't drill the holes too close to each other
     
  16. dallasg

    dallasg Thread Starter Moderator MASA Contributor

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    cool, need to drill 2 in the center about 10cm appart and thats all :)
     
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