Re: someone told me... (question)
Posted by
Torsten
on 2003-11-29 14:39:33 UTC
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Earl" <colin@v...> wrote:
500 quadrature count encoder will resolve 2000 positions per
360 degr. of rotation.
20mm = 0.787401575 inch per turn
So the theoretical resolution would be
0.797401575/2000 = 0.000393701 inch per step or 0.01 mm.
This is called the resolution of this setup.
The accuracy will be the actual positioning precision after
all electronic and mechanical deviations are counted in and
are likely to be be much more then this.
Good Luck
> I am looking at buying some linear motion units. The specs on themwith
> are:
>
> 16" travel, 20mm pitch ballscrew, 200W Panasonic DC brush motor
> 500 C/T encoder.drive.
>
> The seller claims positioning accuracy of 0.0005" with a Gecko
> I am confused by this. from what I understand is 20mm (per turnboth!!? :)
> 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
> Thanks for any insite yall. I have been running a stepper systemand
> am looming to jump into the servo world.Colin, encoder resolution is usually spec'd as quadrant so a
>
> Colin
500 quadrature count encoder will resolve 2000 positions per
360 degr. of rotation.
20mm = 0.787401575 inch per turn
So the theoretical resolution would be
0.797401575/2000 = 0.000393701 inch per step or 0.01 mm.
This is called the resolution of this setup.
The accuracy will be the actual positioning precision after
all electronic and mechanical deviations are counted in and
are likely to be be much more then this.
Good Luck
Discussion Thread
Earl
2003-11-29 13:08:13 UTC
someone told me... (question)
Bill C.
2003-11-29 14:31:50 UTC
Re: someone told me... (question)
Torsten
2003-11-29 14:39:33 UTC
Re: someone told me... (question)
industrialhobbies
2003-11-29 14:54:52 UTC
Re: someone told me... (question)
turbulatordude
2003-11-30 06:02:10 UTC
Re: someone told me... encoder resoultion or accuracy
Earl
2003-12-01 14:51:54 UTC
Re: someone told me... encoder resoultion or accuracy
industrialhobbies
2003-12-02 05:55:03 UTC
Re: someone told me... encoder resoultion or accuracy