joejansal
noticing nice landscape pebbles
Member since August 2009
Posts: 98
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Post by joejansal on Sept 7, 2013 8:37:01 GMT -5
hi all, need info on 1.5mm diamond core drill bits, I am using 1.5 diamond bits now and seem to be having a problem with them dulling out to quickly. I drill holes in seashell which isn't very hard, I drill under water, tried diamond twist drill bits they do not even penetrate the shell. I use diamond core larger bits and they work well, but I have to clear out the piece by hand. that is why I need info on the 1.5mm core bit, will it be plugged solid, and how do I clear it, does it have a hole on the side like my larger core bits. any info would really help, I have tried all types of bits thanking you in advance joejan
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unclesoska
freely admits to licking rocks
All those jade boulders tossed in search of gold!
Member since February 2011
Posts: 934
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Post by unclesoska on Sept 7, 2013 10:42:34 GMT -5
I tried 1.5mm core bits awhile back and they worked well for the first couple holes, but I had trouble removing the core after that. I had to use a needle to remove cores. Have you tried starting a hole with a round ball diamond burr and then using your drill bit to finish? That's what works best for me. Drilling seashell would produce alot of waste, so make sure you're really clearing the hole of debris after every drill insertion, otherwise this will slow down the drilling and clog your bit. I Hope this helps.
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<'))))>< Fish
Cave Dweller
Gone Fishing
Member since April 2005
Posts: 1,841
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Post by <'))))>< Fish on Sept 7, 2013 12:42:27 GMT -5
I drilled holes in harden steel, using carbide drills, that should cut shells like butter.
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Post by jakesrocks on Sept 7, 2013 22:01:42 GMT -5
Anyone using the smaller tube drills might want to invest in a set of welding torch cleaning wires. Just about any size you could want for cleaning cores out of those tubes A whole set isn't all that expensive.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 9, 2013 13:24:01 GMT -5
the diamond to stone ratio is very small in the tiny core bits. They don't really dull out. They just get used up. I used to drill 3mm holes in 20mm granite. Each core drill was good for 5 holes. Bits for $5 ea, $1 per hole. I can core 2" holes for far less.
That is the cost of that business. Just a fact of life.
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Post by johnjsgems on Sept 10, 2013 7:41:24 GMT -5
Make sure you use the wire drills with a pecking motion. Touch the shell and back off. This lets the water flush away the drilled material and keeps the drill cool.
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Post by broseph82 on Jan 26, 2015 12:23:49 GMT -5
Use a water swivel and sintered bits.
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Post by Rockoonz on Feb 8, 2015 1:19:16 GMT -5
We use lube cool 4800 in our drilling water at 1/2 the trim saw dilution, I think it's like 20:1. It has doubled the life of our drill bits.
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Post by orrum on Feb 8, 2015 8:08:15 GMT -5
Good info Rockonz.
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Post by phil on Feb 12, 2015 13:46:18 GMT -5
Are you drilling with light pressure for a 3 count then pulling the bit out for a 3 count, then drilling for 3, out for 3 etc etc and either drilling underwater in COLD water or have a water spray directed into at the hold and bit?
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mrzulu
starting to spend too much on rocks
Member since May 2015
Posts: 245
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Post by mrzulu on Sept 4, 2015 9:59:48 GMT -5
Great info!
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mrzulu
starting to spend too much on rocks
Member since May 2015
Posts: 245
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Post by mrzulu on Sept 4, 2015 10:02:05 GMT -5
Use a water swivel and sintered bits. Water swivel? Splain please?
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Post by broseph82 on Sept 6, 2015 1:34:49 GMT -5
Use a water swivel and sintered bits. Water swivel? Splain please? Connects bit to drill and puts water to the inside of the bit continuously
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mrzulu
starting to spend too much on rocks
Member since May 2015
Posts: 245
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Post by mrzulu on Sept 6, 2015 16:32:30 GMT -5
Cool...!
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