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Old 08-30-2017, 08:54 PM
BobFish BobFish is offline
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Default Hard Coral

I am trying to drill through hard corals and neither concrete bit or high speed steel will touch it.....anyone drill really hard coral
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Old 08-31-2017, 01:14 AM
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Quote:
Originally Posted by BobFish View Post
I am trying to drill through hard corals and neither concrete bit or high speed steel will touch it.....anyone drill really hard coral
Diamond drill bit?

https://www.homedepot.ca/en/home/p.5...000529505.html
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Old 08-31-2017, 01:38 AM
Tyfighter Tyfighter is offline
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A concrete bit will drill through it if you have it on have it on the hammer setting. If you don't want to risk cracking it you would want to use a diamond bit as stated above. What type of coral are you drilling and what size is the hole?
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Old 08-31-2017, 02:04 AM
BobFish BobFish is offline
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used diamond bit, masonry bit wouldn't touch it, thanks for the replies
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Old 08-31-2017, 02:08 AM
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You're drilling coral or rock?
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Old 08-31-2017, 06:14 AM
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drilling very hard coral, some of it is softer!
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Old 08-31-2017, 01:15 PM
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Like Tyfigher said, concrete/masonry bits will work but they need to be used in a hammer drill on the 'hammer drill setting'. The size/brand/quality/condition of the bit and drill makes a difference too. They are however pretty rough/violent and wouldn't be my first choice.

There are bits for drilling through tile as well as diamond coring bits which have already been mentioned.
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Old 08-31-2017, 03:25 PM
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There are bits for drilling through tile as well as diamond coring bits which have already been mentioned.

This is what I've used
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Old 01-02-2019, 04:33 PM
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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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Last edited by Kobiyashi; 01-02-2019 at 04:42 PM. Reason: Didn’t read entire post...
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Old 01-02-2019, 11:49 PM
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Try using a diamond drill
LOL
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