First off, who was it that wrote this about vaccum casting anyway.. ?? I only
have on thing to say about it.... GIVE IT UP.... I have been doing vaccum
casting for a long time and never have problems with my vacumm coming up or my
silcon pads scorching or loosing detail.. You obviously don't know what you
are doing. As for your investment breaking down, well maybee you should learn
how to properly mix the stuff first... Oh by the way I have had flasks in my
oven withstand temps of over 1550 degrees due to driver error (me) that is I
forgot to turn my oven down.... The inevestment problem has nothing to do with
vaccum casting anyway....
MarcFrom: email@example.com on behalf of Jim Chambers
Sent: Thursday, October 03, 1996 7:40 PM
Subject: Centrigical vs Vacuum
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!)