Lapidaryforum.net
Gadgets, Gizmos, and Dohickeys => Cutting, Grinding, Polishing => Topic started by: nwbeachrocker on January 21, 2017, 11:52:28 AM
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Hello,
I'm looking to drill some holes in agate and other rock. I have seen some examples of cabs on this site with some clean holes, nice beveled edge and all. I recall seeing a few that Gergis had done. Any recommendations on the best type/brand/source for drill bits for this? I've been using some cheap harbor freight diamond coated bits, but would like to invest in something decent. Cheers
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Any sintered bit works well if well lubricated and a light touch is used.
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The person who said any sintered bit knows his stuff, so there's your answer. I believe my bits always come from lasco, and while I have broken my share of stones in the drilling process, its a matter of a light touch, patience, a new bit when appropriate, and practice. I use a Dremel drill press attachment but many small lapidary drills will work as well. There is a tapered bit that can be used to flare the hole superficially,. And of course don't allow that stone to slip in the process. I nest mine on a layer of thick cardboard that when soaked with water does allow the stone to nestle securely, and provides a bit of gap so I don't drill through to the bottom of the container holding the water coolant. Drill away with confidence, but practice on some slabs before you do your best and final produced cab.
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Maybe I'm behind the times but all my diamond bits from Lasco are plated. I don't think they supply sintered bits unless it's something new.
Several companies offer sintered tools including Badger, Mountain Mist, Kingsley North, Diamond Pacific, Gesswein, etc. I'm not sure how cost-effective they are compared to the cheap Chinese plated bits. If you're careful and aren't doing production work you can make quite a few holes with the disposable cheap ones.
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Great info, thanks. Are we talking about solid shank or core drills here?
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My reply concerned solid bits, except for Badger (both). Just Google "sintered diamond core drill bits" and you'll get lots of hits.