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 foreverHi 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?
Dallas the sandtonian
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 )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.
I'd love to take the credit, but it is a fellow reefer that showed me how to do itGreat 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 )
Yup, I agreeThe 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
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