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Introducing - Rolf Hubert


Name: Rolf Hubert
Email: @rolf
Address: 14 Scenic View Drive
Pelham, NH 03076

I work for SPI, the company that makes jewelry using Computer
Aided Design and Manufacturing. We have installed over 100
systems worldwide. Some of our customers design and manufacturer
100 - 150 new designs per month. Design a ring and build it
automatically over night. If you have an opportunity check out
our homepage We will be
exhibiting the system at the JA NY show in Booth 1075 & 1077, a
Gesswein Booth, on Jan 24 - 26

Some of our customers include Tiffany, London Star, Ubio, Vargas,
Uncas, DBC, QVC, A. Jaffe and many more.

If you can’t see us in NY, we will be in Basel.


Rolf - Thank you for the introduction to your web-site and
product. I’ve been hearing alot about the 3-D Cad Scam machines
and was quite taken by the potential. My question is this: how
efficient are they in reproducing models of 3-D figures…say
from a drawing of the human form ? I’m not refering to a
bas-relief but a fully developed, sculptural rendition of the
human body? Kim.



Instead of drawing a sculpture on a piece of paper, draw it on a
computer. From this, you can produce nearly perfect models at
any size as long as it fits in the build volume 300 x 150 x 230
mm. I know that the Barbie doll might not qualify, but we have
produced this model on our machine.

We produce jewelry models that are impossible to do by hand and
then we can produce matching brooches and matching earrings with
not much effort.

Let me know if their is anything else I can do for you.

Rolf Hubert


Hallo Rolf, Your intro on Ganoksin was very interesting. I went to
your website and that too was very infomative. I am a
manufaturing jeweller in Botswana and Zimbabwe. My methods are
traditional (hand modelmaking,vulcanizing and casting). I wonder
if you could help me. I wish to find out where one could buy CAD
software for jewellery design.And, might you know of any firms
who would undertake to make a model from CAD designs? Any
pointers would be much appreciated. Thanking you, Hans Meevis.

Designer African Jewellery
P O Box 266,Kasane
Tel : (267) 650-555
Fax : (267) 651-168
e-mai: @afrigold


Aloha Rolf, You will find the list a welcome site. I am glad you
came. There are several members on list doing CAD/CAM (Milling).
On occasion Dimitri, a rep from Gold Machine does a plug for his
and Golds’ interest. I am a modelmaker to the trade (handmade and
milling), a dealer/tech rep for Modelmaster ( Model Master Headquarters )( The Delcam Web Site )
(We rep Sanders) Sanders and
an educational tech rep for MasterCAM
Mastercam . I hope this opens a good discussion of CAD/CAM and
Rapid Prototyping. I hope some people from Tyler, follow this
one. Peter Rowe and friends should have some interest as well (as
this is was an item in the newsgroup ( for a time)
How do you feel about Rhino, as opposed to JewelCAD (Or other
surface modelers) and how is stereolithogaphy superior or faster
than milling (aside undercuts). This should prove to be
interesting, for a start. Rolf, Welcome to the group.

Best Regards,

Christian Grunewald
Precision Modelmaking


On the bold assumption that you might find an independend
opinion of the Saunders process of use, here are some
observations. I’m sure Rolf can give you more detailed info on
just what his system can and can’t do, but your questions
suggests to me that you may have some slight misconceptions of
the computer aided design and manufacturing process.

Kim, the process is two fold. The CAD (computer aided design)
process is the design one, and takes place in your computer only,
where you must draw the design. But unlike paint programs, you
must completely design the 3D form, using either wire frame
constructions, or better, NURBS curve surfaces, or solids
modelling software. The computer must know exactly where all
surfaces and solid portions of the design are, and it knows that
because you input it. It’s not automatic. The software will
provide drafting/designing tools, but you must construct the
design in digital space before a machine like the Saunders
modelmaker can create the model for you in real life. Once
you’ve designed a piece, you then can decide which of several
options you wish to use to actually produce the piece. This
includes the Saunders machine, or tradtional CAM machine tools,
or other methods.

The Saunders process is a variant of traditional CAM machining
(usually using various machine tools, like milling machines etc.)
that falls into what’s called RP, or rapid prototyping methods.
These generally avoid a whole slew of setup process, involving
selection of cutters, considerations involving tool paths for the
cutters, or holding mechanisms for holding the block of raw
material for machining. They do have their own limitations, in
some cases, but it’s a lot quicker to go from CAD design to a 3D
model with RP methods. The accuracy of these processes, and
there are several of them, can be phenominal, and the types of
curves and complex shapes attainable is more limited by your
ability to design them on the computer than the RP processes
ability to translate them to real life models.

The computer driven milling machines used in traditional CAM
machineing can be made to give you almost glass smooth surfaces
if you’re willing to take that much machining time, and have a
machine tool of sufficient accuracy (expensive). Most RP
processes, including the Saunders one, use buildup methods Build
a model in succesive layers with a descrete thickness to each
layer (The Saunders page says their range from .03 to .07 mm
thick, which is a damn thin layer. Their resolution is about
.025 mm, which again is pretty precise) that leave at least a
slight “stair step” sort of surface, like a topographic map, or
the pixels on a digital image, or dot matrix image, on surfaces.
The scale of these stair steps in some processes, like larger
scale stereolithography, can be coarse enough to be very
objectionable in jewelry scale models. The Saunders process,
though, is quite good in the fineness of it’s resolution. Some
models may need a little touch up finishing, either to the model
or the resultant casting, before final molding, but others may
not. And in some cases, the characteristic surface left by RP
processes may itself found to be an attractive feature to be used
by the designer, instead of being shunned.

Back to CAD… (the designing phase). I’ve seen some software
that can take a graphic, 2D image, and translate it into relief
images of varying depth. The one I was most intrigued with, last
time I looked, used a TIFF file as input, and the output was a
CAM toolpath for a milling machine, with multiple paralell
straight lines, much like the scan lines on a T.V., where the
variable depth of cut was proportional to to the light/dark value
of the image. Darker meant deeper. so a digitized or scanned
photo could be milled, and the deepest cuts would be where the
image was darkest. The resulting carving, in metal, or wood, or
wax, once fed to a milling machine, was an uncanny translation
of a 2D photographic image to a shaded relief, but the relief was
not actually a relief carving of the image. That’s what I liked
about it. Kinda abstract in the end… There are also, more
polished and now marketed, software packages out there, usually
sold along with the mills they drive, that take a 2 D drawing or
scanned image, and translate it into a true, “what you’d
expect”, relief carving. These things probably cannot take a
scan of a photo of a face, and produce a really good looking
milled image of that face (unless you take the time to actually
design, in a CAD program, the complex surfaces and curves
required) , but they certainly can take a scanned image of a
celtic interlaced knot, and turn it into a highly precise and
detailed relief carving in wax, suitable for casting into a nice
piece of celtic interlace design jewelry… Sort of the same way
you can take a normal image in Photoshop and using an "emboss"
filter, create the look of that image translated into a relief
embossed image…

For some ideas on what can be done in the design process, go
look at the Rhino web site and see what
those images look like. They are true 3D designs, complete with
all the needed 3D to let a machine like the Saunders
one produce the shapes with accuracy in 3D. My old alma mater
for grad school, Tyler School of art, now concentrates in it’s
graduate metals program, on CAD/CAM/RP methods, and their web
page shows the efforts of current and past students as they
explore what they can create with these rapidly emerging
technologies. Worth a look. will take you to
the main page of that department. Look for the links to the
galleries at the bottom of the page, to find some past work, and
current works in progress of the students.

Hope this helps.

Peter Rowe


Hi Hans, My name is Dmitry, I’M from New York (Originally from

Use to be bench jeweler and Model maker 25 years. About 2 years
ago I start thinking how to make My job easier.

(To make long story, short) Finally I found people, who introduce
Me to new technology. I was first man in New York State who start
learn how to use New software “Jewel Cad”. (Software was design
special for Model Maker 6Pro it’s generate special file formats
.JCAD, .SLC) It’s took Me about 6 month to learn, because
everything was new for Me. Today I’M professional in this field,
nobody knows this program better then Me.

I have 25 students in deferent states USA and many different
countries Also I learn how to use Model Maker 6-Pro, and I have
one. You can build up to 20 different models (rings, errings) at
a time. Average time per model 8-10 hr. If you build 10 models at
a time, it’s take about 40 hr. If you divide 40 hr. :10 models =
4 hr per model. More models at a time you build, less time you

I provide service for everybody who use different software to
create design in any field, (not just jewelry), and need hard
models. You need software which export .STL, .SLC, .IGES files. My
price $30 hr. to build hard models on Model Maker 6 Pro and $50
hr. to create design (usually to create regular model, like
ring, take it about 4-5 hr) It is easy to operate. Now program has
tutorial It have a library of stone shapes with settings, rings,
shanks and many different parts. Everything you build up, became
your library. You have to use your imagination. You do not have to
be professional computer man, you don’t have to know a lot
about PC Today you can learn this program for maximum 2 month
Software was design for Windows 95 and no problem .

Pentium-166 (233 preferred)
32MB. of RAM
4 MB. Video card
Today this configuration - standard

The software cost $3995.00, and you can purchase directly from

If you have any questions, call me at (718)457-8408, or email Me
at: @Dmitry_Goldfeld

Visit My home page again You find
there a lot of about “JewelCad” and “Model Maker


Dmitry (Doctor Jewel Cad)


Software has come a long way since 4 years ago when Sanders
announced the ModelMaker to the jewelry industry at Basel.
Rhino is a fine package but so are the rest of them. It all
depends on the effort you want to put into them. Peter Rowe
mentioned Nurbs the other day. This is a mistake if you want to
introduce CAD as a tool to the jewelry industry.

The craftsman would like to try to design jewelry on a computer.
But telling him that he needs to trim surfaces is only going to
scare them. Jewelcad is the only package that caters to the
jewelry industry and you don’t need to be a computer junkie.

I know jewelry designers that use Pro-E, Alias, SDRC, Rhino,
Trispectives, and Jewelcad. Jewelcad is an overwhelming tool to
get started. One may find later , that he needs to do faces and
then buys Alias or whatever. But the most important is learning
how to design using something other than paper. This group
would be really interesting if everyone helped each other on
techniques on designing jewelry.

Sanders has a users group and they help each other on how to
make the system more efficient. Tips are great, but UPS

Send me an email and I’ll try to get you a demo copy of jewelcad
or I’ll find out where you can get one.


Dear Hans,

In response to your inquiry regarding CAD software, AJM magazine
publishes an annual Technology Sourcebook each November. In 1997,
they had an entire section devoted to CAD/CAM systems. It
shouldn’t be difficult to get a copy: just shoot an e-mail over
to and ask. Or check out their Web
site at (You can subscribe to the
magazine right on-line, or send the nice people an e-mail.)

AJM has also done several articles on CAD/CAM for the jewelry
industry. You can get listings for them by using the article
index on the web site, and then requesting copies. (There may be
a slight shipping charge, but it shouldn’t be much.)

As for companies that do models, I know there are a number out
theRe: probably a couple right here on Orchid! There’s also a
company that advertises in AJM: Edwards Industries. They’ll work
from CAD files or from an original model, which they digitize.
E-mail them at or check out their web site
at I’ve visited the
Edwards operation, and know a number of people over there:
they’re good folks. Perhaps they can help you.

Suzanne Wade
AJM Contributing Editor


Hi Suzanne, We’ve met a few times and I’m happy to say that
Gesswein is also selling the Sanders Model Maker and would be
more than happy to do parts. Contact the Gesswein company at