I’m somewhat amazed that in this extensive thread, the fundamental
differences between vacuum and centrifugal casting have not come up.
I would first like to say, THEY BOTH WORK VERY WELL!!! And I might add
that most of the professional casting shops I have worked in use vacuum
What I recommend is anyone interested in really learning casting do
reasearch, get every book you can find and read them. If you really
understand the theory and complications (which are MANY), you’ll usually
get good results.
I need to say this, NO DETAIL IS LOST IN VACUUM CASTING, depending on
the metal being cast. For instance, I wouldn’t cast 10k white gold on a
The problems that exist with centrifugal casting also exist with vacuum
casting. They basically boil down to knowing the correct temperatures
for the metal being cast, and spruing the piece properly.
As a casting professional, I must say that you have to know what you’re
doing to get good results, and long experience is a great teacher. It
took me YEARS of problem solving to REALLY understand what goes on when
the metal is poured or injected.
Jim Chambers wrote:
Worth 1 cent . . . not two;
Started with Vacuum … as an amateur . . I continue to consider myself as
an amateur probably due to casting techniques and as one would, have tried
many, many ideas, methods, suggestions to very little added success. . .
most local "business professionals, casting for as a corporations have
- " Detail is lost with vacuum!" . . . spelled ‘Quality’
- " Readability, forgiveness, in method is lost with vacuum!"
… GET RID OF IT!!! …
THAT’S WHY I LOOKING FOR A CENTRIFUGAL!
C U R R E N T P R O B L E M S WITH 'MMYY' VACUUM PROCESS!
Instruction which came with the unit(most popular brands carry basically the
same ‘blue’ , ‘multi buck unit’)
Equipment documentation suggest that the silicon pad scorches at 900
degrees. Investment break down between 1250 and 1325 . .considering the
problem presented by porosity at higher temp, in that silver melts at
16++/17++ depending on quality . . there is a ingrained problem…
( And I've had/have them all . . requires more control than the less
Absolute prefect surface is required relative to the bottom of the
flask being cast… drop an empty flask and you can either through
it away or file the bottom for an hour to remove the dent… a
break in the vacuum!
Slightest 'scorch/ring in the pad( $20.00 A pop!) will prevent the
vacuum from taking Place! . . . NOW WHAT ABOUT THE MOLTEN SILVER(Watch
that temp!), cylinder getting cold( greater difference in silver temp
and cylinder Temp spelled porosity!.
Vacuum allows doubt as to success with pour . . Vacuum often doesn't
come up and you feel you must pour because of the variations in temp! .
. sometimes it works … sometimes it doesn’t! . . . as Processes go
this just doesn’t make it . . according to most pros I’ve met … and
this amateurs . . unless someone out there can help!! Got to give it
ETC., Etc. . . If you have the answers .... I'm listening!
HEADED FOR CENTRIFUGAL IN TAMPA!
(SOMEONE, . . . AN A MATURE, TELL ME THE PROBLEMS WITH CENTRIFUGAL…
PLEASE NOT YOUR SUCCESSES!)
Handmade 18K and platinum gemstone jewelry. Fine die
and mold engraving. Diamond setting. Class rings/pins.
25 years experience in the jewelry trade. 515-472-9830