Re: someone told me... (question)

500 ct X 4 = 2000. The Gecko has a feedback encoder resolution of
times four.

Bill C.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Earl" <colin@v...> wrote:
> I am looking at buying some linear motion units. The specs on them
> are:
>
> 16" travel, 20mm pitch ballscrew, 200W Panasonic DC brush motor
with
> 500 C/T encoder.
>
> The seller claims positioning accuracy of 0.0005" with a Gecko
drive.
> I am confused by this. from what I understand is 20mm (per turn
> ballscrew) divided into 500 positions for that turn is only
0.04mm,
> or ~.00157" resolution.
> I asked him and he replied with this:
>
> The 500c/t encorder. The Gecko will count 1 pulse x 4 = 2000 pulse
> per turn 20 mm / 2000 counts = .01 mm ( .0003937" )
>
> something is not right. am I confused or is he.. or are we
both!!? :)
> Thanks for any insite yall. I have been running a stepper system
and
> am looming to jump into the servo world.
>
> Colin