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Posted in response to Drilling small polished stones for stringing? from Tammis on November 21, 2010 at 09:54:46:

Re: Drilling small polished stones for stringing?

...Tammis. ... the VERY best thing I used was a 50-watt IMAHSHI Ultrsonic drill... went through 1/8"(3mm) of very hard Jamaican (where I'm from/live) ..in ten secs.. this too, has its problems.. you have to have a good torch and some soldering skills..bits costs are waaay down, and are made from stainless wire ...the 250,000 cycles per sec and the applied grit and water do the trick..! Anyway, back to earth.. I've had a Covington drill for years, and takes about 15 minutes to go through 1/4 inch of agate.. expect about a minute to a minute and half per inch ... DO use a foot switch to vary the speed (Dremel speed is useless, here, I think).. AND proper ground fault circuitry..water and amps and us dont mix!!! BUY THE BEST BIT YOU CAN AFFORD!!.. the sintered or embedded ones are best, as you can "sharpen" them much like a saw blade as you go along... when you have only the stick of the shaft left, you KNOW its time to change!! Be gentle... "a LIGHT, pecking motion" I was taught, allowing the whirl of the drill to flush out the debris...you dont want to spend your time drilling debris, now do you ??
Anyone need two 30-inch .103, 1-inch arbor MK blades? Have one hour of use.. I bought the machine and converted to 24 inch.. VERRY REASONABLE !!

From Tony Goffe - January 16, 2011 at 19:23:18
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Message: 69640



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