kiwiraka Posted June 11, 2016 Report Share Posted June 11, 2016 I'm going to drill one of my tanks for an overflow, will 20 mil be enough drainage for 300 lph? Also, where do you get glass cutting drill bits? Quote Link to comment Share on other sites More sharing options...
kiwiraka Posted June 11, 2016 Author Report Share Posted June 11, 2016 www.trademe.co.nz/building-renovation/tools/power-tools/saw-blades/auction-1101339934.htm will this be any good? Quote Link to comment Share on other sites More sharing options...
livingart Posted June 11, 2016 Report Share Posted June 11, 2016 Get a 38mm drill and put a minimum of 25mm bulkhead in kiwiraka 1 Quote Link to comment Share on other sites More sharing options...
kiwiraka Posted June 11, 2016 Author Report Share Posted June 11, 2016 So would you attach a 20mm fitting to the bulkhead or go with 25mm piping?Why cut such a big hole? In case I need to increase the size? Quote Link to comment Share on other sites More sharing options...
livingart Posted June 11, 2016 Report Share Posted June 11, 2016 run at least 25mm piping, and yes incase you need to go bigger kiwiraka 1 Quote Link to comment Share on other sites More sharing options...
kiwiraka Posted June 13, 2016 Author Report Share Posted June 13, 2016 I've ordered a 38mm diamond drill bit and two 25mm Hansen female tank fittings, one for inflow and one for outflow livingart 1 Quote Link to comment Share on other sites More sharing options...
kiwiraka Posted June 15, 2016 Author Report Share Posted June 15, 2016 Do i use the drill bit as well as the cutter? Or will it crack the glass? Quote Link to comment Share on other sites More sharing options...
Shilo Posted June 16, 2016 Report Share Posted June 16, 2016 Don't use the drill bit, use a template to keep the hole saw in place & water as a coolant.Take a look at: https://www.youtube.com/watch?v=UZBm3iDWcZg from about 4.20 onwards. kiwiraka 1 Quote Link to comment Share on other sites More sharing options...
kiwiraka Posted June 17, 2016 Author Report Share Posted June 17, 2016 (edited) Wasn't anywhere near as stressful as I expected there was slight chipping, but I'm happy Edited June 17, 2016 by kiwiraka Quote Link to comment Share on other sites More sharing options...
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