Re: small 3-axis micro stepper

Tim,

Excellent post!

The only thing I'd add is to be aware of the "EMF included" part of
the 35V spec of this unit, as posted on the xylotec site...

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote:
>
> No offense to Mariss and Gecko as I use his products and think they
are
> great.
> <rant>
> But, for what ever reason the general thought has become that
everything
> need to run at 20 - 25x rated voltage and have a zillion amps. I can
> assure you that there are lots of machines happily running on
Camtronics
> controllers that max out at 36 volts and L297/298 setups. Believe
it or
> not I had my Shoptask happily running on 3.? V motors with a 24 volt
> supply and was getting 90 ipm rapids. Lets get back to reality and
get
> off the ego trip of my hardware has more XXXX than yours and you're
a
> jerk if you don't buy godzilla amps and crank the voltage to 1
millivolt
> short of frying. Heck I even had my Bridgeport running on G210s at
only
> 58 volts and doing 80 ipm reliably. Luckily no one told the motors
that
> they should not be working well at only 10 x rated voltage or so.
Heck
> if you read Mariss' info he recommends that the power supply be 4 -
25 x
> the motor voltage. It is just the group ego trip that says it has
to be
> 20 - 25X or you may as well rake the yard and give up on a CNC
machine.
> </rant>
>
> My guess is that the http://www.xylotex.com/ drive will be a great
match
> to a Sherline/Taig/mini-mill setup. There are plenty of NEMA 23
motors
> that will put out 150 - 250 in/oz in series with 2.5 amps and
amazingly
> they will run just as well and you would never know the difference
if
> you run them at only 1.5 amp. Sure you will lose a little low end
torque
> but a motor in this size range on a little mill can afford to be
down on
> low end torque. My suggestion to Jared is go for it and get
started. The
> board will definitely run the mill. We used less for years and it
will
> be a major improvement over a unipolar drive.
>
> Just remember, the goal is to get a machine running reliable, not to
> build the most optimum setup under heaven.
>
> Tim
> [Denver CO]
>
>
> > Jared,
> >
> > First determine what stepper motors you are going to use with
> > them. The
> > xylotex board is limited to 35 volts.
> >
> > As a general rule, if you divide the 35 volts by 20 you would
> > get 1.75 volts
> > as the voltage for the stepper motors.
> >
> > You can ask others, but I think that 2.5 amps may not be enough.
> >
> > You may want to save up your money and buy Gecko drives.
> >
> > Bob Campbell
> >
> > ----- Original Message -----
> > From: "J" <jaredts@y...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Monday, September 16, 2002 12:54 PM
> > Subject: Re: [CAD_CAM_EDM_DRO] small 3-axis micro stepper
> >
> >
> > >
> > > For anyone kind enough to offer 2 cents:
> > > This stepper driver from xylotex looks like a good setup at
> > a great price.
> > Before I go out on a limb and buy one, does anyone see
> > anything wrong with
> > this system for a small cnc? I have an Enco mill/drill table
that is
> > slightly larger and heavier than a Taig's. I don't know what
> > to use as a
> > spindle yet (I guess just a router for now). Is 2.5 amps
> > bipolar enough? I
> > would greatly appreciate any help from those more experienced
than me
> > (probably 99% of those reading this right now). My problem
> > is that I can't
> > afford geckos, and don't want to buy a unipolar driver board and
be
> > disappointed with the performance.
> > > Thanks,
> > > Jared
> > > bsptrades wrote:
> > > Just spotted this outfit on e-bay looks to be a nice simple
package
> > > using the newer allegro chips. The price seems fair at $90 for
small
> > > projects
> > >
> > > http://www.xylotex.com/
> > >
> > > Brian
> > > BSP
> >