RE: [CAD_CAM_EDM_DRO] variable transformer for dc power supply

Tim,

How big of a deal do you think it is? I suppose it may be more important on
a little desk top like a Sherline, but a larger machine will already have
240 VAC in the spindle motor. The iron should be grounded and any lose
wires should simply short.

Isolation is a fine idea, but I had used DC in lots of larger industrial
machines. Sometimes we let the DC float, but more often I tried to tie it
down. I like to know where things are, particularly voltages.

GTJ

-----Original Message-----
From: Tim Goldstein [mailto:timg@...]
Sent: Monday, November 25, 2002 5:40 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] variable transformer for dc power supply

Troy,

It is not safe to use the variac as the sole transformer in the power supply
as it does not provide isolation.

Tim
[Denver, CO]
Sherline Products at Deep Discount
and Mach1 CNC control
www.KTMarketing.com/Sherline

----- Original Message -----
> I am building an unregulated power supply to power my api stepper motor
drives.
>
> Does anyone know if it is ok to use a variable ac transformer as the
transformer for an unregulated dc power supply? I already own the variac
and it would save me some money and it would allow me to play around with
different voltages.
>
>
>
> Thanks in advance
>
> Troy



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