RE: [CAD_CAM_EDM_DRO] Re: stepper torque.....please help

THANK YOU FOR A CLEAR SUGGESTION. I WAS THINKING ALONG
THOSE SAME LINES.i just wanted to hear it from someone
who actually knew what they were doing. i can always
upgrade later to geckos and get rid of the xylotex
driver.
any suggestions for step/direction milling software
for ease of use, but mostly reliability? ive
downloaded pretty much every demo on the internet. a
friend of mine suggested mastercam but after looking
at his its seems way over my head.
thanks a bunch for your help.i think ill go with the
xylotex driver and see how things go. gotta start at
the bottom, but i always get the urge to jump straight
to the top. its a pity life doesnt work that way
though!
and as far as the cost of machining....well i know
exactly what you mean. i spent twice as much for end
mills and other misc. stuff just to get me going, than
i did for the mill.
i guess when i get it setup for cnc, i can get most
of my money back for the rotary table since i wont be
needing it anymotr.

thanks for the encouragement. because i was really
getting discouraged trying to figure this stuff out
and was getting ready to give up the whole idea
altogether.

--- Tim Goldstein <timg@...> wrote:

> First off, don't be fooled into thinking that CNC is
> an inexpensive
> pursuit. Metal working in general is an expensive
> hobby and adding CNC
> to it only increases the cost. My point in this is
> that adding CNC to
> you minimill may be more expensive than the whole
> mill was.
>
> Regarding series vs parallel:
> Don't get all hung up and think that if you can not
> set up the motor as
> parallel you will have terrible performance. Back
> before a lot of us
> knew better we ran our motors in series and they
> performed just fine.
> Knowing what Mariss from Gecko and others have now
> taught us we have
> also learned that you can run the motor half coil
> and get almost the
> same performace as parallel. So, you have lots of
> options on how to hook
> it up and they will all work and get you cutting
> chips under computer
> control. Don't stress on it.
>
> My advise if you are on a budget would be to get the
> xylotex drive and
> connect it to the motors in series or half coil (try
> one and then the
> other and see how it works for you). You can run the
> motors on less than
> the full rated current and they will work just fine.
> You will lose some
> low speed torque where it does not matter, but your
> running torque at
> any reasonable speed will be limited by the
> inductance and not the
> current limit of the drive. This may not be the
> optimum set up for the
> motors you have, but it will get you running and
> learning. You can
> always move up to some Geckos at a later date and
> sell the xylotex for a
> pretty good percentage of what you paid for it.
>
> Tim
> [Denver, CO]
>
>
> > -----Original Message-----
> > ok well how about this then........i have just
> bought 3 Vexta
> > 305 oz- in 2 phase steppers@4.5A 2 phase
> excitation,2Vdc.,8
> > wire and am
> > trying to determine what kind of driver i can get
> that is not too
> > expensive(ie.gecko's)
> > xylotex.com has a 3axis ,2.5A bipolar driver . my
> question is can i
> > use this driver to run these motors with a
> 24Vdc/12A power supply if
> > i run them in series?if so , do i need to use some
> kind of resister
> > for current limiting? and what (approx.)i know
> that running steppers
> > in parallel is better, but i cant use this driver
> if i run them so.
> > what would the torque then be with these motors in
> series in this
> > setup with the xylotex driver?
> > i ve also been looking at an up to 15A, 3 axis
> unipolar driver from
> > stepperworld.com that would definately have no
> problems running my
> > motors, but i read that using a unipolar driver is
> a bad idea
> > considering the lower performance of it compared
> to bipolar drivers.
> > is this true??what would the actual
> performance(estimated)be if i
> > used this stepperworld driver compared to the
> other xylotex driver?
> >
> > i want the best performance i can get without
> spending more than the
> > whole grizzly minimill cost to begin with. which
> direction should i
> > go?? ive asked the same questions in the mini mill
> group but i have
> > yet to recieve a clear and concise answer or
> suggestion(not that i
> > can understand anyway
> > any help would be great..thanks
>
>
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