Issue No. 281 - Friday, April 23, 2004
Moderated by: Thurmond Moore III
Committed to carrying on the fine works of
Hale Sweeny and Jerry Dewbre
http://www.gemcutters.org or
Hi all,

Short list this week. Have a great weekend.
If you happen to be in Lubbock, TX this weekend
be sure to attend the Lubbock Gem and Mineral
Societies annual Spring Show at the Lubbock
Civic Center.


Index to Today's Digest

01  RE: cutting and polishing tourmaline with a closed c-axis
02  RE: Jamb Peg
03  RE: Faceting machine
04  RE: Hand Faceting
05  AD: gem book availability
06  NEW: Off the dop, Strontium Titanate Round Brilliant


Subject: Re: cutting and polishing tourmaline with a black c-axis
Date: Fri, 16 Apr 2004 12:39:50 -0700
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: Don Rogers <Don@Campbell-gemstones.com>

>polish with linde a (sapphire 14k) on tin and burn in the flow.

Burn in the flow is a term I've not heard of.  What exactly does it mean?




Subject: jam peg
Date: Sat, 17 Apr 2004 08:31:33 -0600
To: <faceters@caprock-spur.com>
From: "jake" <efjke@msn.com>

In regards to the Jam Peg machine, below is a letter that I do not believe
they will mind me sharing. I had mentioned this machine in regards to
another matter, but was glad I got the information. This is from Don Clark
IGS. This information will apply to a few other low budget machines, as well
I am sure.

"I had a look at the AEW-FPK Faceting machine and I would be very cautious
about it. Faceting is precision work and if you have less than precision
tools it quickly becomes a pain in the ass. I started on a Graves and was
constantly making adjustments to compensate for it's inaccuracies. It was
kind of like an old Volkswagen, it would get you where you want to go, but
you better leave early. And it was easy to work on, but something always
needed fixing.

There isn't much information about the AEW-FPK, but it looks like it has a
small protractor. It is real hard to set an angle correctly on a 3"
protractor. After rough shaping, you have to go back and match the setting
for prepolishing and again for polishing. If you miss the angle by .01
degrees it will cause you headaches. You will eventually learn to live with
it, but it is never easy and the learning process is real difficult.

The most accurate, inexpensive machine right now is a 6" model put out by
Polymetric, (about $1400.) I got to use one once and was really impressed.
It was nearly as accurate as my much more expensive Ultra Tec and in many
respects, easier to use.

Rock bottom in price is Wykoff's calibrated jam peg for $100. (See our
Recommended Suppliers) Very hard to learn, but quick to use once you get the
hang of it."

Several years back I had planed to build a machine on the gearloose model.
My brother in-law was a machinist at Hill Airforce, (now retired) after 911
it did not seem like a good idea to have him work on this on his lunch hour
as the rules were changed in that regard. The only thing else was to hire
someone and hope they weren't slower than death with the hourly rate (I do
not have the tools required). I still have a Facetron motor with speed
control. In the meantime I cut some turquoise, and many other things and
this took me in another direction. I still plan on getting involved in
faceting but like all things different projects hit up resources and there
is only so much at any time, unfortunately opal rough (even the "cheap"
stuff), silver, tools, and some others cost money, etc., diamond cabbing
units are not free either, unfortunately. Some on this list are limited in
regards to budget, so you cannot have everything at once, not all of us are
yuppies. Before I got involved with this I made the comment that I wanted
everything (in regards to basic equipment) a reply was that you understand
that will cost several thousands of dollars, this I knew, but like the song
I plan to get it one piece at a time. Wykoff's machine is definitely on my
list of things to get around to, soon, I hope, as long as I can reframe from
some other things. I believe that once I "get the hang of it" that I would
prefer Wykoff's machine, so this delay is I believe in my benefit. For those
who may not know who Wykoff is he is a leading authority and recognized
internationally. As to the calibrated jam peg machine, note that
award-winning competition stones can be cut with it, this is proven. As for
the EW-FPK Faceting machine, I think this is the case where money saved, and
this is important to me, would not be worth it over the long run, besides
the calibrated jam peg is cheaper and I believe the type of machine I would
prefer over other kinds. For information about this you can see
http://stores.ebay.com/GemLore-Productions note also the library, another
project I have to get to.


Subject: Re: Faceting machine
Date: Mon, 19 Apr 2004 22:52:45 -0700
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: Tony <lightbender@thegemdoctor.com>

Hello Jack,

Nice little machine you have there but I think stone inspection
might be a bit difficult.  I would recommend copper laps over
aluminium for cutting.

A jamb peg can be as simple as an eight sided 'dop stick' and a
vertically mounted panel that has been drilled with many holes
or depressions to allow the dop stick to held at the required
angle. There is a slow learning curve but great speed can be
accomplished.  This type of machine can only cut one stone at a

Another type of jamb peg that is considerably more difficult to
master allows several stones to be cut at once. A handful of dop
sticks usually 4-6 are held against a movable bar that
determines the angle. I have met a cutter that claimed to have
cut 10 stones at once and could produce 60 or more stones per
day and has exceeded 100.

Needless to say these machines are not likely to produce well cut
stones and most cutting designs would be unattainable. There has
been attempts to improve on the basic jamb peg which I find
baffling. A real machine will always be more versatile and
complicating the basic jamb peg will only slow down the cutting
operation which is the ONLY advantage to this design. My mast
machine will let me cut a 1 ct sapphire SRB in about 20 minutes
or less. The most I have cut in one day was 32 SRB stones,
synthetic Alex, it was a long day.



Subject: Re: Hand faceting
Date: Tue, 20 Apr 2004 00:54:16 -0700
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: Tony <lightbender@thegemdoctor.com>

Hello Larry,

Sorry to hear that you have found a way to hurt yourself whilst
faceting, I have always touted this as one of the least
injurious pastimes.  I have never used a hand faceter but have
met several cutters that do enjoy the portability afforded.

I suspect that the discomfort is caused by your over gripping the
assembly and perhaps attacking the project a bit too vigorously. 
This is supposed to be a fun way of usefully employing otherwise
wasted time and a relaxed grip and less aggressive action should
eliminate the pain. Your production will suffer but you won't.

Cutters that have used these machines either hate them or love
them. The devotees claims include realising the zen of faceting,
stress relief, meditation assistance, defeating cigarette
addiction and of course having fun.


Subject: Adv -- gem book availability
Date: Tue, 20 Apr 2004 15:44:12 -0400
To: lapidary@caprock-spur.com (LapidaryArtsDigest)
From: mskelly <mskelly@gte.net>

         I couldn't find all the gem information I need in one place, so I
wrote a short book putting it in one place. Gemstone Fact and Fancy is now
available through Cafe Press at
         The book contains all the gemstone information, except
photographs, found in my web site.

mike in West Coast Florida
Virus-free by Norton


Subject: Strontium Titanate Round Brilliant
Date: Tue, 20 Apr 2004 15:49:14 -0400
To: lapidary@caprock-spur.com
From: mskelly <mskelly@gte.net>

         A few days ago I finished cutting a standard round brilliant using
strontium titanate. The finished stone is a colorful stone over a champagne
background. It measures 10.5 mm and weighs 6.80 carats.
         I was hesitant about using the material since I was forewarned
that any strontium titanate  that would produce a stone of this size always
has a yellowish cast, and yellow is not one of my favorite colors. But this
stone has what I would describe as a champagne rather than a yellow. It's a
beauty. The picture
does not do it justice.
         If you prefer a clear stone rather than one with the yellow tint,
you will have to settle for a one or two carat finished stone.

mike in West Coast Florida
Virus-free by Norton










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