Re: stepper accuracy compared to servos...

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Paul <no.spam27@n...> wrote:

>
> At first read, the original post looked like B.S., however, if the

servo

> system in question is a G320/340 step/dir type drive, then yes, the

dynamic

> accuacy is going to be suspect. The one point I would disagree with

is the

> "you are guaranteed to have a dynamic accuracy of much better than

one full

> step" statement. Your accuracy is only going to be plus or minus

one step,

> never "better than".

I read that as if one is microstepping.....

That means 8, 10 or more microsteps which may be off by some error,
but unless a step is lost, will be much better than one full step.

Even a half step error reduces the possible error.

I think the bottom line is that most people start out with steppers,
and then either build another machine and use servo's, or swap out
the steppers and use them in another machine.

There is a HUGE established base for steppers and demand is
constant. I would not be surprized if the installed base on here is
more than 10:1 in favor of steppers.


I wonder if Mariss would tell us the percentages of each style he
ships a month ?

Dave