Rogue Trader
freely admits to licking rocks
"Don't cry because you are leaving, smile because you were there."
Member since December 2008
Posts: 839
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Post by Rogue Trader on Apr 21, 2009 3:56:20 GMT -5
... Short & Thick does the trick ;D :help: Genuine Questions: I want to drill a 8mm hole through a 10mm thick slab. Should I use a thin drill bit initially to drill a pilot hole, and then use thicker drill bits. Or do I just use the required sized drill bit. Also, what is the best drill speed to use to drill holes? Slow speed or high speed, and should I use play putty around the hole to build a dyke to contain the lubricant/coolant or should it be kept flowing? :nono: No doubt there will be some gutter post replies to this thread also
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Post by 150FromFundy on Apr 21, 2009 6:59:07 GMT -5
Not sure about the pilot hole, but you want the highest RPM possible. To drill, you want to use a Dremel (or something like that) where you can get 25,000 to 30,000 RPM out of it.
You must drill with the piece submerged under water fro cooling and to keep the deadly dust down. Silicosis sucks!
I think there has been a previous post on RTH on how to do this.
150FromFundy
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Post by Hard Rock Cafe on Apr 21, 2009 7:28:02 GMT -5
I've done a couple of holes, but not a lot. I would recommend drilling a pilot hole because you're going to get blow-out (chips) on the opposite side when the bit comes through. If you use the pilot hole you can then move to the larger bit and go half way through on one side, flip the stone over and do the other side.
Either the dam or submerged will work, but I prefer submerged. That way you are sure to keep flushing the hole.
Key tip: don't just drill straight through like you would with wood. Use a piston action where you drill, back out, drill, back out, etc. until you're through. This keeps the bit cool and flushes the grindings out of the hole.
I agree with 150: high RPMs.
Hope this helps, Chuck
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Post by NatureNut on Apr 21, 2009 7:28:48 GMT -5
Woulda thought Shannon would be jumpin' right on this...
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Apr 21, 2009 7:28:58 GMT -5
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181lizard
Cave Dweller
Still lurking :)
Member since December 2005
Posts: 2,171
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Post by 181lizard on Apr 21, 2009 10:51:55 GMT -5
I like to keep everything submerged. This pic shows a dremel I use to use but I now use a foredom & love it! I also like to use as coarse a bit as I can. Chews through rock much faster.
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lsmike
spending too much on rocks
Maxwell's demon lowers tumbling entropy
Member since January 2007
Posts: 468
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Post by lsmike on Apr 21, 2009 12:05:19 GMT -5
You can also use a cone-shaped bit to ream out a pilot hole-of course you will have to go from both sides.A ball bit also can work.Mike.
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Post by Hard Rock Cafe on Apr 21, 2009 12:35:21 GMT -5
Good links Dr. Joe!
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Rogue Trader
freely admits to licking rocks
"Don't cry because you are leaving, smile because you were there."
Member since December 2008
Posts: 839
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Post by Rogue Trader on Apr 21, 2009 14:38:30 GMT -5
Thanks for those links Dr Joe. Really is appreciated, and they certainly contain loads of information.
Stopped me jumping in with both feet and possibly knackering my drill bits.
Thanks also to everyone else for their useful information.
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Post by Bejewelme on Apr 21, 2009 18:33:48 GMT -5
There is so much good material in this thread, I really don't know where to start! I am still having fun with the other thread!!! Amber I will wait for Shannon!!
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Post by Jack ( Yorkshire) on Apr 22, 2009 2:06:08 GMT -5
Hi RT,
Ive drilled 1.5 mm up to 13mm and used fast and slow speeds drilling experements,
I see that the recomended speeds are by a drill manufacturer ??
I find that (In my own experiance) if I use the Dremell (high Speed) a drill bit will drill 4 or 5 holes only before getting blunt (under water up down all by the book)
If I use a ordanary DIY drill 10 or more holes ,
I dont know if others have had this experiance ?
Experiments were in Drilling Agates and Jaspers and Quartz
have a good day
Jack Yorkshire UK
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Post by Jack ( Yorkshire) on Apr 22, 2009 2:23:11 GMT -5
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Rogue Trader
freely admits to licking rocks
"Don't cry because you are leaving, smile because you were there."
Member since December 2008
Posts: 839
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Post by Rogue Trader on Apr 22, 2009 2:46:41 GMT -5
Thanks Jack, noted
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 22, 2009 13:53:10 GMT -5
Amber, Really no relevant info I can add other than long and thin or short and thick.......dont matter as long as you know what the hell you are doing with it......umm pertaining to drilling holes. That was what we were talking about right? Drilling holes?
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Rogue Trader
freely admits to licking rocks
"Don't cry because you are leaving, smile because you were there."
Member since December 2008
Posts: 839
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Post by Rogue Trader on Apr 22, 2009 14:11:23 GMT -5
Weeshann - drilling rocks dear Drilling rocks
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pebblepup
has rocks in the head
Succor Creek Thunder Egg
Member since July 2008
Posts: 515
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Post by pebblepup on Apr 24, 2009 11:56:31 GMT -5
I use a core style bit (about 10mm) I purchased on eBay to make slab clocks. Using my drill press I put just enough pressure to let the bit cut. I have not worried about the speed and use lithium grease to keep the bit cool. Since the grease is quite thick you don't have to worry about it dripping or splashing allover everything. Cleaning up the grease is easy using dish soap and water.
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sunfighter
starting to shine!
Member since January 2009
Posts: 47
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Post by sunfighter on Apr 28, 2009 19:54:13 GMT -5
Pebblepup...I am glad I signed in and read about your left hand/right brain invention! I had been searching for a lubricate for my core drill bits and saw your posting about lithium grease which I am not familiar with..it sounds like what I need. What can you tell me about it and where did you get it?
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