RE: [CAD_CAM_EDM_DRO] Re: UPDATE: Stepper and Servo power supplies: Microwave Oven Transformers for sale

I don't bother with this. The windings are manufactured separately on
paper bobbins, everything is soaked with varnish and they are slipped
over the cores when the transformer is being assembled. The paper is
more for mechanical support during assembly than anything else. They do
offer a measure of safety as if a turn is loose, it can start vibrating
from the magnetic fields. If it comes into contact with the core, the
insulation could be rubbed off and a short develop.

I am using stranded 10 Gauge and 8 Gauge electrical wiring for winding
my secondaries and the insulation on this stuff is more than strong
enough.

Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Irby Jones
> Sent: Sunday, February 19, 2006 5:45 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: UPDATE: Stepper and Servo
> power supplies: Microwave Oven Transformers for sale
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Halliday"
> <dh@...> wrote:
> <snip>
> > I have removed the secondary on a few of them (starting my
> projects)
> and
> > the best way I have found is to clamp the transformer into
> your vice
> and
> > then use a smallish (16 oz.) hammer and a 1/2" cold chisel to cut
> > through the copper windings. The quickest and the safest. Make sure
> > that you work _away_ from the primary windings.
>
>
> Dave,
>
> Do you try to leave the paper (or whatever is there) in place that is
> between the windings and the core?
>
> Irby
>
>
>
>
>
>
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