RE: [CAD_CAM_EDM_DRO] Re: Xylotex Pwr Sup replacement

Hi Dave:

Nice writeup. Of course, in #3, you meant "volts/turn".

Thanks,


Andy Wander


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
Sent: Sunday, November 13, 2011 8:38 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Xylotex Pwr Sup replacement

the beauty of rewring a microwave is that you can make as many wraps as you want to get the voltage you want.

here is an optin. get a 10 pole terminal strip.
wrap 10 wraps, bring the end to position #1
make another 2 wraps bring that to pos #2,
2 more wraps, pos #3 and so forth.
then you can measure the voltage at any one and pick the one that serves your needs best.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dave Halliday" <dh@...> wrote:
>
> I have mentioned a few times before but a microwave oven has an excellent
> transformer for this purpose.
>
> #1) - do not play with it (plug it in) while the high voltage winding is
> still in place. The voltages and currents developed can be instantly lethal.
>
> #2) - because the high voltage winding is so high (around 2,500 volts), the
> primary and the secondary windings are separate. Most transformers have
> these wound on top of each other. This allows you to remove the high
> voltage winding with a hammer and cold chisel. There will also be a
> filament winding -- two or three turns of thick wire; this can just be
> unwound.
>
> #3) - wind ten turns of insulated wire around where the high voltage winding
> used to be, power it up and measure the resultant voltage on your new
> secondary. Divide by ten and this will be your turns/volt.
>
> You can then figure out from there how many turns are needed.
>
> The advantage of these is that dead microwave ovens are free and the
> transformer is good for 500-800 watts continuous power. Excellent for
> projects like this.
>
> Dave
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
> > Sent: Sunday, November 13, 2011 9:08 AM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] Re: Xylotex Pwr Sup replacement
> >
> > you really need to keep the voltage lower.
> > remember that the decel of a drive will spike the power
> > supply. fast decel times can make the voltage jump.
> >
> > if you can put your hands on a computer battery back-up, you
> > can get some high amps from the transformer.
> >
> > also, a car charger will have a large transformer.
> >
> > you will still need capacitors and diodes to get DC from
> > these AC units.
> >
> > you can lower the amp rating of the drive temporarally while
> > waiting for the perfect fix.
> >
> > all electronics offers power supplies that are DC, you should
> > be able to get one in a few days.
> >
> > Dave
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ebiz_59" <chuckm@> wrote:
> > >
> > > Murphy bit the Xylotex box on our minimill tonight. It
> > appears as though the 24V 6A power supply gave up the ghost -
> > just when we were FINALLY making our first part for our FTC robot.
> > >
> > > So I need some ideas for replacing this power supply
> > quickly. I think I saw a 30V power supply on an HP printer
> > the other day, but I'm thinking it was only a couple amps.
> > And I think I might have a 15-20V 4ish amp laptop supply lying around.
> > >
> > > Any other thots? And what are the odds that the Xylotex
> > drives are OK if this power supply board is only putting out
> > like 1.5V? Should I be looking for another set of stepper
> > drivers too?
> > >
> > > Ugh! Chuck
> > >
> >
> >
> >
> >
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