Re: someone told me... (question)

This is right
The 500c/t encorder. The Gecko will count 1 pulse x 4 = 2000 pulse

> per turn 20 mm / 2000 counts = .01 mm ( .0003937" )

The 500 C/T is 500 pulses in quadature (I spelled that wrong), when
you do the resolution you get 500 X 4 (quad) or 2000 pulses per rev.

The X and Y axis of my kits run a 500 CPR encoder and x 5 TPI
ballscrew is how I get .0001 Calculated Resolution.

Not knowing what you're converting you might want to stop by my web
site and look at the How To's to get a complete idea of all the steps
involved in converting a bench Mill to CNC.

If you want to talk it over email me your phone # to
admin@... (I will not try to sell you anything).


Thanks
Aaron Moss
www.IndustrialHobbies.com

--- 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