Well it was being used to produce stainless steel shell mould castings
each of 12Kgs in a foundry in France (yes it's well travelled!). The
actual crucible and coil are mounted rather like a concrete mixer, in
that they can be totally inverted, and the shell mould is fixed to the
top of the crucible. When the charge was molten, the whole kaboosh
would be inverted filling the shell mould. The size of the driver is
way too big for the size of the crucible, so I imagine they did it
that way to get fast production rates. I intend to make a somewhat
bigger pot assembly with perhaps 50-75 lbs of cast iron , and use it
in a tilt mode direct into conventional greensand moulds. Jan Rawlings
of The Todd Engine Works (Stateside) is melting 75 lbs at a time using
a 50 KW induction furnace, but that one isn't electronic, its a
motor/generator set so effectively the operating frequency is set.
Mine 'pings' the coil occasionally, tests the resonant frequency, and
sets itself at that setpoint using a microprocessor. The power
thyristors are as big as teacups and mounted on water cooled copper
heatsinks, The buss bars taking in the 3 phase are 25mm x 5mm copper
In article , Scrim
No, those of us living A^*£$^£( within a few miles of Andrew
£$%^£$£*Q£"&$£Q$^(£$(£Q&*_£Q$&()£Q$&)(£Q$Q£ hardly notice any effects
EWRGTE^&TR*£YTR at all.
Except for \"&^^$*^$&£$£&$*$£()"$*& those with pacemakers who
£&$^(£&$(£^$*&£$*($^£&*%£"^ hardly ever complain.
More than £$)£^$&*^"£(%"!£^&%"*T$£("%(*"£% once.