LAPIDARY DIGEST
Administered by Hale Sweeny (hale2@mindspring.com)
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This list digest contains the following message subjects:

1. LapDigest News for Issue No. 141 - Monday 5/11/98
2. NEW: What Diamond Wheels Should I Order?
3. NEW: Information on VIGOR Electric Burnout Furnace.
4. RE: Information on VIGOR Electric Burnout Furnace.
5. RE: Information on VIGOR Electric Burnout Furnace.
6. NEW: Looking for Smokey Quartz Bracelet
7. NEW: Cutting Curved Facets
8. RE: Drilling Stones
9. RE: Drilling Stones
10. RE: Drilling Stones
11. RE: Drilling Stones
12. RE: A Possible Cheap and Safe Cutting Oil
13. BIO: Erik Jorgensen
14. BIO: Dale and Roz Miller


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<MSG1>

Subject: LapDigest News for Issue No. 141 - Monday 5/11/98

The sand and the surf at Hilton Head were wonderful therapy
and I got a lot of needed rest; now back to work.

If anyone has channel work patterns they can share with this
whole list, please let me know. I will try to put them up on
a website somewhere.

Have fun, gang.....

hale
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<MSG2>

Subject: NEW: What Diamond Wheels Should I Order?


I am setting up a work shop in a 12x20 lofted barn this
summer where I hope to cut and polish my own special shaped
freeform cabs for my custom angel jewelry. It is my
intention to order a Genie grinder and to use a six inch trim
saw and an older Highland park (8 x 1 1/2 wheel) grinder
which has space for 2 diamond wheels, one expando drum, a
muslin buff and a leather covered disc. I am seeking
opinions on the correct (best?) set of wheels to order with
the Genie and on how to utilize the H.P. grinder.

I want to use all diamond and I will be using pre-cut slabs
approx 1/4 inch thick I have been acquiring these slabs for
years and they include all hardnesses of stone. Would you
recommend *hard* wheels or Nova wheels or a combination of
both? What combination? How fine should I go on the Genie?
In what steps? Should I put two coarse wheels on the H.P. and
get finer wheels only on the Genie?

I have a million questions, so I'll stop here for now since
this will be the first big investment in this project.

Sincerely, Dale Miller
<rozdale@ccia.com>
http://www.ccia.com/~rozdale
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<MSG3>

Subject: NEW: Information on VIGOR Electric Burnout Furnace.


I'm trying to locate a supplier for B. Jadow and Son's VIGOR
Electric Burnout Furnace.

At a garage sale, I bought their model CA-1045, 1 phase, 115
volts, 14 amp, k-w 1.6, vent hole on top and peek hole in
front door---and want to find the instruction book that must
have been with it at one time. Also, this unit has a LO to
HI rheostat for temp control, but no built-in temp gauge--and
I need to find out if, and how, I can fit the unit with a
temp gauge. Does anybody out there have any experience with
this furnace?

Anything you can do to help me locate the 'owner manual' and
info on retrofitting a temp gauge will be very much
appreciated.

All the best,
Leslie
leslie@olypen.com

"non-commercial republish permission granted"
-------------------------------------------------------------
(Ed. Note: Now I know that this is outside the LapDigest
scope, but I thought others also might be interested. So I
sent a copy of Leslie's letter to an old friend, Fred Sias,
who is a very clever engineer and who also teaches casting.
Fred's answer to Leslie follows. I think Fred's two answers
are sufficient to close this thread. hale)
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<MSG4>

Subject: RE: Information on VIGOR Electric Burnout Furnace.


Leslie:

Looking thru my old catalogs, I find that FDJ (Winter Park,
FL. 1-800-323-6091) used to handle Vigor ovens. The
particular part number was not listed in my catalog, but they
handle quite a number of replacement parts and can probably
contact the manufacturer about your needs.

Analog pyrometers are also available from VIGOR as well as
lots of other folks. Price for instrument (meter) and a
thermocouple is around $100.

This gives you a furnace but no controller. Electronic
controllers cost $200 and up but a simple oven controller
(called an infinite switch) can be obtained from kiln
manufacturers for $18-$20. Experimentally set it to hold a
particular temperature. Try Olympic Kilns, Atlanta, GA
at 770-441-5550. They also have pyrometers listed in my old
catalog at $85.

Hope this helps,
Fred
frsias@ces.clemson.edu
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<MSG5>

Subject: RE: Information on VIGOR Electric Burnout Furnace.


Leslie:
I was just visiting a jeweler's tool dealer today and have
some new information. My FDJ catalog was several years old
and their new catalog doesn't show the VIGOR furnace any
more. I was talking to another jeweler's supplier today and
got some further information. It appears that the VIGOR line
is no longer available -- there was some sort of buy out.
Perhaps the successor company can provide the parts you
need.

I also found a lower priced pyrometer: about $58 for the
instrument and about $27 for the thermocouple. All you do is
hook them together and you have a Pyrometer.

For help call Steve Darnell at Darnell Jewelry Tools and
Supplies next week. He can help you find the parts. Tell him
I told you to call and he may remember our conversation.
His company receives calls from 4:30 to 11:00 p.m.
Phone: 614-637-4457. It's in Knoxville, TN.

Good luck,
Fred
frsias@ces.clemson.edu
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<MSG6>

Subject: NEW: Looking for Smokey Quartz Bracelet


Does anybody know where I can find a dark (black) smokey
quartz bracelet? This repair I have was either made from a
solid carved smokey bracelet or in sections, anyway I need a
piece that is 30mm x 8mm x 5mm. Strange huh? Anyway I don't
know how to cut and polish the inside curve.

Nick
nicknlee@webwide.net

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<MSG7>

Subject: NEW: Cutting Curved Facets


Can anyone point me to a company that makes or sells faceting
machines /equipment for cutting convex/concave facets. At
one time there was a company called Polymetrics which did
this, but I can't find it.

Thank you.

Duncan
dwelliott@msn.com

non-commercial republish permission granted
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<MSG8>

Subject: RE: Drilling Stones


NO dentist will give you unsterilized bits! If they did, they
would be open to malpractice lawsuits. Mine autoclaves them
when I am getting "worked on", then gives them to me on the
way out. These are usually pretty well worn, not new-ish as
you imply, but they still have plenty of life in them, and
appear to be both sintered and plated bits. I'm sure all
dentists do things a little differently just like we
rockaholics.

Tim Fisher
<tim@OreRockOn.com>

non-commercial republish permission granted
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<MSG9>

Subject: RE: Drilling Stones


Diamond tipped drills work real good at drilling holes in
everything from Agate to travertine (honey onyx) here in the
Northwest. Keep the drill point and material wet to make your
drill last longer.

On beads or other material, drill from both sides to prevent
breakout. I generally hold the beads in my hand and drill
with a dremel. That way I can tell whether it is heating up
too much, which will also age your drill bit prematurely.

I find my diamond drill bits at Lortone, Inc. 2856 N.W.
Market St, Seattle, WA 98107, (206) 789-3100.

George Burkhardt
(geoburk@halcyon.com)

Noncommercial republish permission granted.
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<MSG10>

Subject: RE: Drilling Stones


I had wondered if/when someone would think to sinter diamond
to a drill bit. Now I know that they have, where can we get
some?

Thanks,

Tom Burchard
Roxhund@aol.com
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<MSG11>

Subject: RE: Drilling Stones


A while back someone recommended, (I suppose for brittle
stones like garnet) drilling in from both sides; e.g., drill
halfway in, back out, turn the stone over, and drill the rest
of the hole from the other side, to prevent "Blowing out"
when the drill clears. Excellent advice, with one fly in the
ointment. The Indians (Hindus) do this all the time, and
mostly they get away with it. But sometimes (just often
enough to make my wife redrill every indian-drilled garnet
she gets her hands on), as the holes don't quite meet. This
leaves a small, but sharp 'ledge' which is guaranteed to cut
thru every type of cord except tiger tail(R). Now, if you
knot between every two beads, this is no problem; but if you
don't, or if you use monofilament where you can't, you are
asking for spilled beads as the stone cuts the cord. So;
it's time-consuming, but worth it in beads that don't come
back, to run a diamond bit of the appropriate size through
every hole; if a ledge is encountered, be sure that it's
smoothed out, which may entail redrilling from both sides.
Sounds like a lot of trouble, but it only takes a few seconds
for each bead, and is, as I say, definitely worth it.

As for ultrasonic, it's definitely the way to go, as far as
speed and uniformity of results, with few if any 'blowouts.'
But wear ear protection! The energy required to drill a
stone is sufficient to damage an ear drum, or cause otitis
media or otosclerosis. You only have two ears, and ear
damage is irreversible.

That's my 2 cents' worth on drilling (smile)!

Ted Robles
erobles24@hotmail.com

non-commercial republish permission granted.
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<MSG12>

Subject: RE: A Possible Cheap and Safe Cutting Oil

<<The Food and Drug Administration (FDA) has classified
propylene glycol as an additive that's "generally recognized
as safe" for use in food. It is used to absorb extra water
and maintain moisture in certain medicines, cosmetics, or
food products. It is a solvent for food colors and flavors.

Propylene glycol is simply glycerine. This is about as
non-toxic as you can get.
Chip Kent
<drk3548@unix.tamu.edu>
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Subject: BIO: Erik Jorgensen

I owe you my BIO. My name is Erik Jorgensen and I live in
Denmark, 30 miles north of the German border. I am a retired
mechanical engineer and also a gemologist(FGA) and have
been so for 20 years. All my machinery is home-made. I
have all of the common instruments, and my work is
non-commercial.

Special interests: All kind of lapidary (faceting incl. MOF).
Investment casting (Centrifugal vacuum and pressure on home
built equipment) . My aim is to see how far I can press
processes.

Erik.
<gemerik@post1.tele.dk>
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Subject: BIO: Dale and Roz Miller


Hi...My name is Dale Miller and I began Rozdale Designs
(http://www.ccia.com/~rozdale) in 1988 as a hobby for my wife
Roz and myself. The exact story is on our web site if you
are interested.

In the ten years since our interest began, we have fallen in
love with the gemstone trade and the wonderful people we
have met while selling our signature product which we call
"Ultimate Angels". I am an Engineer (I repair X-ray
equipment) at a local hospital by profession, and our gem
trade is a side business that we do for pleasure, interest
and of course profit.

I am an amateur graphics artist ( I built our web site and
did all the art work therein) and a retired musician.

Roz is co-owner of a local coffee house/restaurant. We have
two children, one a college music major and one a precocious
8 yr old who has appeared in two high school plays and is
currently earning a black belt in Karate.

Thank you,

Dale and Roz Miller
<rozdale@ccia.com>
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