RE: [CAD_CAM_EDM_DRO] Re: Xylotex Pwr Sup replacement

Hi Andy -- you are correct.

Have spent the last couple days doped up on cold medicine so the brain is a
bit offline...

I see about 1.2 to 1.5 v/t depending on the cores, a few have been close to
two.

Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Andy Wander
> Sent: Sunday, November 13, 2011 6:37 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: 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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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider
> this to be a sister site to the CCED group, as many of the
> same members are there, for OT subjects, that are not allowed
> on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
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> List Mom
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> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider
> this to be a sister site to the CCED group, as many of the
> same members are there, for OT subjects, that are not allowed
> on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
> bill
> List Mom
> List Owner
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