Re: [CAD_CAM_EDM_DRO] OT: Hi Freq. Centrifuge

Hi Sven,

Two possibilities spring to mind. How about using a coil to couple to the
furnace's electronics inductively and putting the output of this coil
through a frequency divider to get it down to frequency you can measure - it
will reduce the accuracy quite a bit, but I don't suppose the furnace will
mind the frequency being a little off the mark. The other possibility is
using a second frequency source to compare with - feed both frequencies into
a comparator and watch for the beat frequency. This will be far more
accurate than the first idea. Isn't 1,3MHz somewhere in the radio band -
perhaps you could just tune in a radio nearby until you hear the
whistle.......

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK

----- Original Message -----
From: "Sven Peter" <peteryco@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, June 11, 2002 11:05 PM
Subject: [CAD_CAM_EDM_DRO] OT: Hi Freq. Centrifuge


> Hello Friends,
> This is OT but I hope somebody may help me.
> I have to repair a high frequency induction centrifuge for to cast
> chrome cobald dental parts. In 10 years I got these things Dentaurum
> Megapuls memorized already but I would not like to make all coils new
> again like 7 years ago.
>
> This time the hole electric system is working fine without trouble.....
> EXCEPT..... the heat comes up too slow and often the metal not even
> melts.
>
> Humidity here in Costa Rica is breaking everything. These units in
> Europe have no trouble at all.
>
> All electrical components are OK. I changed a few parts of the coils
> that seamed to be internally oxidized and things became better.
>
> But how to tune the frequency if there is nothing to measure it with?
> (4500 VDC, 4KW, supposed to bee 1,3 MHz (that is beyound every
> Osciloscope's capacity I have ever seen.))
> I would appreciate every help off line.
> Thanks
> Sven Peter
>
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