Re: [CAD_CAM_EDM_DRO] Z-axis stepper size?

Is counterbalancing an option for the z-axis ? This is what thefullsized
machines do and considerably reduce the axis power requirements.

Regards Peter

----- Original Message -----
From: "Chris L" <datac@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, December 19, 2001 12:43 AM
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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