Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo

Hi guys,

Talking about Gecko G320 servo driver. Are they fit for any type of DC Servo
motor? I have a National Servo motor but I could not find the Electrical
specification.

By the way, instead of buying Gecko G320, can we just build one using some
Power MOSFET construct it in H-Bridge? Wouldn't that be cheaper than buying
a Gecko driver?

Regards,
Albee

----- Original Message -----
From: "bull2003winkle" <bull2003winkle@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, February 10, 2004 11:48
Subject: [CAD_CAM_EDM_DRO] Re: stepper vs. servo


> Scott:
>
> What you say is correct, and either will work subject to some
> limitations. The main advantage of servo's is speed. The main
> advantage of steppers is simplicity. If steppers can meet your speed
> requirements then there is no significant advantage to servos.
>
> There are other differences, of course. Steppers are great for high
> torque at low speed and servos provide the most power at high speed.
> The speed/torque curves for steppers show that they are constant power
> devices with torque decreasing with speed.
>
> BTW, the Gecko G320 is a servo drive, the G201 is a stepper drive.
> They both look the same to Mach2.
>
> Regards;
>
> Ken
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "plastiguy" <plastiguy@a...>
> wrote:
> > Group -
> > I'm going to go ahead and open up this can of worms (though I'm
> > certain it's been done many times before my time in this forum). The
> > age old question has popped up again. For a 4x8 CNC router with
> > pretty standard mechanics I can effectively use either steppers or
> > servos, each of which I can readily find within the torque range I
> > need (400 to 600 in-oz, about 200 watts max), and each of which I can
> > use with my driver of choice (Gecko G320) and each of which fit
> > comfortably into my budget and each of which are addressable with my
> > software of choice Mach 2 AND each of which offer the resolution
> > (depending on manufacturer) I desire. So, I'm finding it more and
> > more difficult to commit one way or the other. Given these equalities
> > for my specific application, I'm beginning to think that in the end,
> > from a performance and features standpoint, there'll be no
> > significant difference. Oh sure, I know the stepper-advocates will
> > point to the consumable brushes on the servos, and the servo-camp
> > counters with...well, something equally relatively minor, but are
> > there big glaring pitfalls and upshots for these different means of
> > moving junk around that I'm missing? I'm a believer in "You get what
> > you pay for" so I don't want to sacrifice anything important just to
> > save a few bucks and go with steppers, whle I also don't want to
> > throw money away by integrating servos when, once the covers are put
> > on the machine, I'll never even detect the difference in having put
> > the servos on instead of the steppers.
> > Hope I'm missing something so I can GET ON WITH IT!
> > Scott
>
>
>
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