Re: Encoders on stepper motors.

Hi Art,
The ecoders catches missed steps caused by: Bad feed rates,
dull tools and line noise. Set you machine and program up to drill a
hole in each corner of your table. Use a scrap piece of plastic. Use a
tiny drill. Run the machine for two hours drilling the same holes
over and over. Use your fastest traveling speed between holes. All
four holes should look round when it is done. A broken bit says it
all. I used to have a line noise problem before I moved my controller
to a computer supply. Running a Shop Vac or electric drill on the same
line as the machine can also cause problems. I run my Dremel on a line
cord plugged into a different socket on a different line.

John

--- In CAD_CAM_EDM_DRO@y..., "Art Fenerty" <fenerty@h...> wrote:
> Hi All:
>
> I might be missing something here. I have heard alot about
encoders on stepper motor systems increasing accuracy. Am I wrong or
is the only purpose of an encoder in a stepper
> motor system only used in the case of a stepper missing pulses? If
the stepper never misses a pulse, the encoder does not do anything.
The motor can only be positioned to a multiple of its stepping
resolution, right? If a motor misses pulses, isn't this an indication
of a poorly powered stepper
> system? I get the strange feeling I'm missing something obvious.
>
> Thanks,
> Art
>
>
> [Non-text portions of this message have been removed]