Re: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?

It's in the second column of text and about 2/3 down the page.
Drew

Peter Reilley wrote:

> Thanks,
>
> I looked at that datasheet but did not see it, I must be going blind.
>
> Thanks,
> Pete.
>
> ----- Original Message -----
> From: henrikolsson2001
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: Wednesday, January 07, 2009 11:52 AM
> Subject: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?
>
>
> Peter,
> There's a datasheet on the CUI Inc website where they state:
>
> 7500rpm for 2048, 1000, 800, 384 ppr
> 15000rpm for 1024, 500, 400, 192 ppr
> 30000rpm for 512, 250, 200, 96, 256, 125, 100, 48 ppr
>
> Here's the datasheet:
> http://www.cui.com/pdffiles/AMT102-V.pdf
>
> Although not that hard to make yourself there's also a ready-made
> line-driver cable assembly available for a reasonable $7.15.
>
> /Henrik.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Peter Reilley" <micrio@...>
> wrote:
> >
> > I wonder about these encoders. I cannot find a specification for
> their
> > maximum speed. There is a description of how they work on the web
> site.
> > They use a capacitive pickup against a wavy pattern on the encoder
> wheel.
> > There appears to be about 8 waves per rotation. That means that
> > they are multiplying the 8 waves by various factors to get all
> their selectable
> > resolutions. This technique probably limits their maximum speed.
> I am
> > suspicious that they don't specify it anywhere that I can find.
> It could be
> > fairly low!
> >
> > Pete.