Hi Alma, We may be able to help with both issues. First I'll answer
your questions then tell you what we have. We repair the equipment
jewelers use and we know from experience which equipment is good and
which is not.
The side draw bell jar is preferable in the event of accidental
overflow/spilling of investment. The straight bell jars have the
vacuum drawn down through the table and if investment gets spilled
or boils over the top of the flasks it can get sucked into the lines
and pump. When this happens the unit has to be taken apart and can
take several hours to clean and get running again. This won't happen
with the side draw units.
The two table units are preferable because the casting chamber is
made to handle blowouts if they should occur. In other words they
capture the bulk of the investment and metal before it can get to
the vacuum lines.
As for the Ney spin caster I would have to say they probably over
fluxed their melt and had too much metal. They may have overheated
the metal as well. With an electro-melt you don't ever flux the
metal so you don't have this problem and you pour the metal so if
you did have too much in the melter you don't have to pour all of it
in the flask. You will also be able to melt enough metal for several
small flasks at the same time in the electro-melt. This can speed
casting because you don't have to wait for the metal to melt for
Now, we have a used Rio vic 12 unit that is selling for $650. It has
the 'Assistant' which can be removed easily and we warranty the unit
for 6 months. It uses a 5 cfm vacuum pump so you will get better
casting results and better fills. It's in very good condition and
will save you a few hundred dollars.
Also we have a new 30 ozt manual electro-melt we used for display
at a show and we are selling it for $499. It has a full one year
warranty on it and comes complete with stirring rod and crucible.
This will also save you a couple hundred dollars.
If you are interested in these or have other questions let me know
by email or calling toll free 1-877-262-2185.