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Polishinh holes


#1

I am starting a project, where I will be drilling holes in a faceted
stone, and need to polish the inside surface.

Drilling is easy enough - anyone have any ideas, on how to polish
the inside? I have the usual sequences of diamond paste available
(220,600,1200,300,14,000, 50,000)

I just do not know what to use for a tool, Hole diameters are 0.75
mm to 1.5 mm .

Mark Zirinsky, Denver


#2

Hi Mark, I use fully worn bits for the first steps through 1200.
Then repeat 1200 on copper wire followed by 3000, 8000 on a tooth
pick. Use plently of lube to prevent over heating fracturing.
Marcus Amshoff, Santa Fe


#3

Copper wire might work. I would work harden it first and try to make
sure it was very straight. Diamonds have an affinity for copper and
copper is used for some faceting laps because of this. Karen


#4

Mark,

   Drilling is easy enough - anyone have any ideas, on how to
polish the inside? I have the usual sequences of diamond paste
available (220,600,1200,300,14,000, 50,000) I just do not know what
to use for a tool, Hole diameters are 0.75 mm to 1.5 mm . 

Couldn’t you put a toothpick or something in a Dremel and use that?
I’ve polished the insides of holes with chopsticks turned down to the
size I need, and coated with buffing compound.

Loren
http://www.golden-knots.com/


#5

Mark, I once heard a lecture by Michael Dyber, who makes fabulous
faceted stones with tubes drilled in them. He was not willing to
share this particular technique with us but, having heard how he does
other things, my guess at his tool would be a toothpick or other
wood shard chucked in a rotary handpiece.

Linda


#6

Here is an articulate answer, from offline, thought I’d share it:

Howdy Mark, I am a serious hobby faceter but very beginner
metalsmith. You’ll get a lot of suggestions I’m sure. First, I would
suggest you practice on some ‘scrap’ material first. Also, try
skipping the 220 step, maybe the surface left by the drill is
already close to this. As for tools, copper would be my first choice.
You will need seperate tools, stored seperately, for each step and
THOUROUGHLY clean between steps. Be as cautious as you would be with
your buffs - plus some. Try a ligt oil for a lubricant,colant. Olive
oil or WD-40 would be good carriers for diamond. You will need much
less diamond after the first tool use because the copper will 'take’
a charge and hold on to it. Be careful doing any wiping or you will
scratch the surface of the stone (I assume they’re already finished
on the exterior?) You don’t mention what material you’re working with
but many materials will look fine after 14K diamond. That’s
considered a commercial polish. I’d start by going with a 320 or 600
for a first step. Then something like a 1200 or 3000 prepolish. Then
go to the 14K or, for quartz and beryl, cerium oxide using a
toothpick or some type of plastic,(lexan,lucite,etc.) If you still
see scratches it may mean you will need that 220 initial step. good
luck! Carl R. Downey 1 Lucky Texan alckytxn@swbell.net