Re: servo board

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "george_barr"
<george_barr@y...> wrote:

> Thanks for replying. My first router/mill will use geckos. In

fact,

> I already have 3 geckos for step/direction. However, I would like

to

> eventually move into the more professional stuff like servos.

You do know gecko also does servos, right :)

I have

> looked at the servotogo, vigproducts.com (cost too much since it
> needs more expansion boards), and pico-systems. I am just stuck
> between the servotogo and pico-systems. I was told that the
> servotogo has an 8 MHZ ISA bus while the pico-sytems uses a fast
> parallel port. I was told that the ISA is a much faster
> communication bus but I am not sure if that translates into better
> performance.

ISA is much faster but you'll have a hard time finding a fast PC with
ISA slots, which comes back to a slow PC.

To save cost, I'll use brush DC motors using 23 or 34

> NEMA motors. What I like about pico-systems is that you can buy

the

> starter 4-axis kit and then later invest more for the full 8-axis.
> However, pico's 8-axis system cost more than servotogo's 8-axis
> system. Also, servotogo's says you need a opto-22 product which is
> probably another board to hold the relays (more cost). I know that
> servotogo is used by many, but pico is fairly new. Pico has more
> resolution using 16-bits rather than 13-bits, if it is needed. How
> uses/buys the pico system? I would like to hear from users of the
> pico servo systems. My future plan for this servo project is to

add

> a DC motor for the spindle to do tapping,

Unless either one of those boards does on-the-fly current limiting,
you probally want to use a tapping head instead of a servo, because
the servo will snap a smaller tap in a heartbeat (force the
movement). On the other hand if you use a spindle speed sensor, and
the feed/rev feature of your software you'll get a tapped hole.


add 4th/5th axis, add lathe

> attachments.

Add Lathe attachments? Is this a 3 in 1 machine? or are we takling
a rotary table or somthing?

Email me at admin@... with your phone #, ( I promis
I won't try to sell a thing), I would like to discuss this a pinch
more offline, to better understand what you're trying to do, and
maybe give you some other ideas.

Thanks
Aaron Moss
www.IndustrialHobbies.com




That is 7-axis already. I can't tell you more since I

> am a newbie.
>
> Thanks,
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "industrialhobbies"
> <admin@i...> wrote:
> > I just took a quick look at both of the mentioned boards and
> noticed
> > that the servo amp seems to require the other components (Pico)

and

> I
> > didn't see any volt/amp numbers for the other. Which makes me
> > question the total price of the application.
> >
> > I noticed you used the words "cost-effective" in your question,
> which
> > leads me to believe this is a hobby application, is this the case?
> >
> > To recommend a controller we would have to know more about your
> > application. For example if you were just doing a CNC mill or
> > something Geckos are the way to go(my opinion), but on the other
> hand
> > if you are building a teachable CNC arm or something like that

you

> > would need the additional features offered by these products and
> > companies.
> >
> > Also what kind of servo are you talking about? (I'm guessing
> brushed
> > DC) How many volts? Amps (cont)? Amps (peak)? Motor torque
> > constant?
> >
> > When it comes to picking a controller (either servo or stepper)

all

> > these factors come into play it unjust of us to make an opinion
> > without these.
> >
> > So include a pinch more and we (open forum) will probably be able
> to
> > give a better opinion.
> >
> > Thanks
> > Aaron Moss
> > www.IndustrialHobbies.com
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "george_barr"
> > <george_barr@y...> wrote:
> > > I am looking for a servo controller. I have looked at www.pico-
> > > systems.com and www.servotogo.com controllers. Which of these

2

> > > servo controllers is better and why? Is there any other cost-
> > > effective servo controllers out there that I should look at?
> > >
> > > Thanks,