Re: Why is the push to such high step rates (Grex and Arc100)?

That's what I am trying to grasp, what applications are there that
utilize such high speed & high resolution?

Based on the little that I know about drives, motors, and
electronics, the only thing that I can see with a 256 microstep
drive is just to have a larger number of steps within a given about
of rotational displacement. It has been said by many that you
cannot rely on the precision of the microsteps, only the full steps
of a stepper motor. So, if that is correct, then the only advantage
of having 256 microsteps is perhaps a smother motion? Again,
assuming microstep as a stepper motor driver, how many stepper
motors are out there that can deliver any useable torque over 1000
RPM?

As for servos, I can see where you can put on them very high
resolution encoders, but where and how would you use something like
that? Servos don't have much in the form of low RPM torque, so
running something direct drive with them is unusual such as a timing
belt pulley attached directly to the servo.

As for resolution and precision, in machine tools, it's pretty hard
to find anything with a resolution better than .0001" or .001MM.
Beyond that is very impractical without taking some very special
steps to insure the mechanicals can deal with any more resolution.

Perhaps there is something in the production of silicon wafers or
something that this sort of resolution and speed is utilized? I
can't imagine anything in: metal working, woodworking, robotics,
etc. so I am sort of stumped as to what applications this would be
for?

Thanks

Chris







--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
<mariss92705@...> wrote:

>
> 256 microstep drive at 3,000 RPM equals a 2.56 MHz step pulse
> frequency.
>
> 4,000 line encoder on a 6,000 RPM servo equals a 1.6 MHz step

pulse

> frequency.
>
> Not all applications are low speed, low resolution.
>
> Mariss
>
>