TERRY ROWEKAMP Posted August 31, 2016 Share Posted August 31, 2016 Best drill bits for drilling holes in fossils. Link to comment Share on other sites More sharing options...
Troodon Posted August 31, 2016 Share Posted August 31, 2016 Welcome to the forum. What size hole are you talking about and type of fossil being drilled. Link to comment Share on other sites More sharing options...
TERRY ROWEKAMP Posted August 31, 2016 Author Share Posted August 31, 2016 orthoceras. Used 1mm diamond bits and they break just when I get near the end Link to comment Share on other sites More sharing options...
Troodon Posted August 31, 2016 Share Posted August 31, 2016 Are you possibly going to fast with excessive pressure and it overheats. Link to comment Share on other sites More sharing options...
Raggedy Man Posted August 31, 2016 Share Posted August 31, 2016 28 minutes ago, Troodon said: Are you possibly going to fast with excessive pressure and it overheats. Many of those industrial diamonds they use for those bits are no harder than quartz. I would suspect that with this and what @Troodon (Ha! Figured I'd see what the hubbub was all about with @****)said, your bits failed. Have you tried a carbide tungsten bit? Best regards, Paul ...I'm back. Link to comment Share on other sites More sharing options...
abyssunder Posted August 31, 2016 Share Posted August 31, 2016 Welcome to TFF ! " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
snolly50 Posted August 31, 2016 Share Posted August 31, 2016 A little drip of water may help - just don't electrocute yourself. Human beings, who are almost unique in having the ability to learn from the experience of others, also are remarkable for their apparent disinclination to do so. - Douglas Adams, Last Chance to See Link to comment Share on other sites More sharing options...
smt126 Posted September 1, 2016 Share Posted September 1, 2016 The other thing is that if you're not keeping your hands steady it will put extra pressure on the shaft of the bit causing it to break. Link to comment Share on other sites More sharing options...
TERRY ROWEKAMP Posted September 1, 2016 Author Share Posted September 1, 2016 thanks for all the advice. I am drilling them in water. The bits I have are blunt, no point at the end and this might be part of the problem. Good advice on the carbon tungsten bits. Will try those. I'll get back to you all later. Terry Link to comment Share on other sites More sharing options...
Fossildude19 Posted September 26, 2016 Share Posted September 26, 2016 I think this was meant to be Posted here. "The key was to use a drill bit that was a spiral bit. Thanks for the advice on using the tungsten carbide bits. They worked great. Take your time, drill under water and use a spiral bit. I used 1mm bits for my holes. If you want bigger holes drill smaller first and then go back and use larger bit. I also realized that I was drilling limestone so the rock only had a hardness of 3. Thanks again for all the advice. Terry" Tim - VETERAN SHALE SPLITTER VFOTM - APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
JohnBrewer Posted September 26, 2016 Share Posted September 26, 2016 Welcome aboard I think Troodon may be right with too much pressure. Get another drill bit and start again and use ice cold water as a coolant. Don't put too much pressure on the drill, the bit should do the work rather than pressure. When you've made what your making make sure you post it on the forum! John Map of UK fossil sites Link to comment Share on other sites More sharing options...
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