Try using a diamond grit tile coring bit, they go as small as 1/4” basically the same bit for drilling bulkheads in our tanks except tiny diameter-wise. Should do the trick just remember to flush the hole with water to keep the core clear and the bit cool.
Edit: methodology of drilling is important. Lubricating the “cut” as well as keeping the drill bit cool. High speed, low feed or low speed high feed. Feed rate = amount of pressure you apply during the cut. If you have tried this already then I guess check geology websites that may have some insights we don’t have.. I’ve seen core samples that have been taken from granite that use a diamond cobalt coring bit and they use a lot of drilling fluid. Try Rapid-Tap, you can get it from Acklands-Grainger
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210 DD mixed reef, 75 gallon sump, SRO 3000, reef keeper, DCP15000 return, 3xAI sol, 250lbs live rock, 45 watt UV feedback loop to refugium, bubble magus doser for the big 3, Liquid carbon dosing. Waiting on a couple gyres....
Last edited by Kobiyashi; 01-02-2019 at 04:42 PM.
Reason: Didn’t read entire post...
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