Re: [CAD_CAM_EDM_DRO] Z-axis stepper size?

Dave,
Microkinetics.com offers their 72 volt 5 amp supply......

CyberResearch.com offers a 75 volt 4 amp switching, and a 80 volt 6 amp
unregulated. They also have quite a few amplifier/drivers and Motors/Controls.

allelectronics.com had a nice big 5lb torroid to build a supply with.... 44
volts 9amps or 88 volts 4.5 amps. 5lbs! They were 20 bucks. Don't know if they
still have them.

I had a link to another Surplus house with some larger High amp supplies. Can't
find them right now. Will keep looking......

Chris L

dlantz@... wrote:

> 70 volt power supply? I have been needing one of those, where did you get
> it?
> ---thanks, Dave L.
>
> -----Original Message-----
> From: Chris L [mailto:datac@...]
> Sent: Tuesday, December 18, 2001 4:44 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Z-axis stepper size?
>
> I would chime in and agree with Bob here......
>
> But it does depend on what you are actually trying to accomplish. At lower
> speeds, those 100oz motors may pull a trim router along. Depends a bit on
> the
> voltage you are running. If your under 40, Forget it. It may work as a
> diamond
> drag engraver!
>
> Typically, the smaller routers that have to lift a full size router will run
> at
> least a 220 oz. Most small desktop engravers these days seldom run anything
> less than a 160oz. Are yours NEMA 23's ?
>
> I would recommend you leave enough room in your design to replace your 100's
> if
> they do not deliver with the largest motors you can run. Then, fire them
> with a
> voltage source much higher than 40 volts so they can deliver all they have
> to
> offer. I've seen some 220-240oz rascals out there !
>
> I've got a machine with a 220 in Z..... She'll push/pull about 125lbs before
> stall at 30ipm. At 100ipm, that would likely drop considerably. But with a
> spindle throwing chips, even 30 pounds of push can do a lot. In the end,
> your
> final gearing may have a lot to do with your results.
>
> There is quite a trade off however in size.... I don't feel bigger is
> better.
> Sometimes bigger is just noisier ! My favorite X-Y target these days is
> 300oz
> running with a 70 or so volt power supply.
>
> Chris L
>
> Bob Campbell wrote:
>
> > I have built several cnc routers. I have used 385 oz/in steppers on all
> > three axis. 100 oz/in seems small unless it is a very light duty cnc
> > router.
> >
> > Bob Campbell
> > www.campbelldesigns.com
> >
> > ----- Original Message -----
> > From: "hotaluminum" <zbadone@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Tuesday, December 18, 2001 8:33 AM
> > Subject: [CAD_CAM_EDM_DRO] Z-axis stepper size?
> >
> > > I'm looking to purchase a few steppers for my soon-to-be built CNC
> > > router table. I will be purchasing +100 oz/in steppers for the X/Y
> > > axis and was wondering do I need one this large for the z-axis as well?
> > >
> > >
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