Hi Todd, I would certainly do a “mold off” competition just for the
fun of it… My experience in mold making dates back to 1968 ,in
Thailand when I was learning mold making from a 60year old
professional… I was 13 years old.My first hand cut mold was a ring
that is called a " princess ring" It had 28 + stones in the head in
3 levels with wire basket work underneath… no hole to remove the
rubber… all rubber had to be removed from inbetween each wire…
This ring was normally made in sections… by other companies… we
successfully made it in one piece… The first production run
required us to make production models and molds from size 4 to size
9… 10 molds of each … all hand cut. Suffice it to say that on
average from 1968 to 1978 I made daily between 15 to 20 molds of a
similar nature…This was because we made molds of each style ring
we produced in sizes 4-9 for ladies and 8 - 12 for men My family had
the first casting company in Thailand.
In late 1979, I came to the US ( I am An American) , went to work
for a Jewelry Supply house as an engineer designing machinery for
all forms of casting and mold making. Within 3 months of working
there… I developed the heat cured silicone mold rubber and a variety
of molding techniques to deal with the fact that the first heat
cured silicone mold material did not have the tear strength that
castaldo Organic rubber had. Then, I was sent to every jewelry show
in the US with vulcanizers and an assortment of models to show the
mold making Technique. This was the first time anyone had seen this
done in public … for free !!! People were going back to their shops
all over New york and the various other places that I was selling and
showing the techniques to get models of every nature you can
imagine… you can also imagine that these were always the " problem
pieces" they had and could not get good molds from their own
moldmakers… At the show, I made every one of these molds … and
they worked very well . The owner Of the company I worked for did
not believe that this material would sell in the very beginning as
all mold makers we met had no clue how to use it and I had to
basically teach many people how to do complex powder seperated
molds. After the first show… the material sold 1600 lbs… the next
show , it doubled etc… On the 4 th year of doing shows, the owner
of Castaldo came to me at the show and said " look, Daniel, I have
copied your rubber ! " … I promptly took out the new material we
were selling which was the improved version that had much more tear
strength and showed this to him. Castaldo later on came out with a
number of versions as even they could see that the heat cured
silicone was the wave of the future… Now, when you go to shows,
You See the Castaldo rubber company showing mold making techniques
and getting sales that way.
I quit being a salesman back in 1986 … I did not work for Castaldo
… And I never got dime one for being the original developer of this
for the lost wax trade… nor was I ever mentioned . It is a thing of
the past.
So , when it comes to doing a " mold Off" competition… It would
not scare me at all… At my shop, I run 4 vulcanizers and when I
sit down to make molds, I make between 25 and 50 molds in an 8 hour
period… I use tripple and quadruple frames double stacked in all
the vulcanizers…Figure this one out… 4 vulcanizers x 4 cavity
moldframe x 2 in each mold and a curing time of 2 hours as they are
double stacked = 32 molds every 2 hours . The most molds I have made
in a single day with an assistant was 128 molds . No one believes
this until they actually come and see it being done. This is what I
call " cooking" ! How many molds have I made in up to now… Probably
upwards of 80,000 molds … I guess you might say that I have enough
mold making experience . How do I accomplish this many molds…
Well, first , the silicone rubber I use comes in 25" square sheets
1/4 " thick. I built my own “cookie cutters” So that all I have to do
is press the cutter into the rubber and pull out a perfectly cut
piece of rubber that fits perfectly into the mold frames that I use.
I make my own frames with a cnc machine So I have about 60 sizes of
mold frames to accomodat almost anything that comes into my shop…
I aslo have coresponding cookie cutters for all of them. This means
that I can ste up all the rubber for 4 molds in under 1 minute. I can
shape the silicone rubber to follow the countours of the models very
quickly so that the partying lines are exactly were I want them…
This takes me under a minute to do as the silicone is soft like
clay. Then, with powder seperation, I don’t have to hand cut the mold
when it is finally cured.It will seperate exactly where I want it
to. I use small locators in the molds … 7 in each mold … in a
specific patern that helps to eliminate parting lines . This was a
development that I had to do to use automatic clamp injection systems
that I built for high speed waxing. ( 1000 + waxes per day/employee
) Also, Have you ever heard of the spinwax process… this is where
youhave up to 30 models molded into one round mold 12" in diameter by
1" or more high… these are used in a spinning wax injection system
for extrem high volume of simple components such as charms . (
complex components can also be done, but the mold making becomes much
more difficult). I bring this up as I am also the original developer
of the spinwax system which was sold in the early 80"s by the
company I designd the machines for…We stopped selling these
systems after 4 years as it required me to spend at least 2 to 3
weeks with each customer that bought a system … to teach them how
to make these type of molds…It took up wayyy to much of my time. I
have one of these in my shop Incase I should need to produce 10,000
waxes per day with one employee… It has been used on rare
occasions after the 1990’s as the volume in this state has dropped
quite a bit.
I know that much of what I say is unbelievable to many people in the
casting field … ( Ihave been told by many that I am a b.s.
artist) , but , when people see what we can do in this company of
mine, they change their minds quickly!
Some of the other accomplishments that I have built … Many of
these concepts and products were stolen from me by various "
trustworthy" individuals … An automatic " tree cutter" … It
removes 300 castings off of a single cast tree , puts them in a box
, undamaged … in 17 seconds. 5 of these were built … 4 are /were
beign used by the biggest US manufacurers … I have the original .
The automatic clamp /wax injector… Design ws stolen from me and
reproduced overseas before I could get/ afford a patent in 1981
Tivac vacuum enhancers for casting flasks
Spinwax system. The list is much longer, but I gotta get some sleep
!!!
In any case, these are just some of the reasons why we are
considered by many as one of the best casting/finishing companies…
We build just about every machine in house for our own use. And I
have a lot of manufacturing techniques/tricks that really help make a
product . Best wishes, Daniel Grandi We do casting , finishing and a
whole lot more for designers, stores, jewelers , students and people
in the trade. Contact: sales@racecarjewelry.com