RE: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?

Well, I've got 6 servos to "fix", and the encoders cost me $40.00 CDN,
which is a fair chunk of hobby money that could be spent elsewhere.
(There's always something else that needs buying ! <G> )

I have ordered one of the encoders Mariss suggested. We'll see what wins
out, my laziness (buy encoders) or my thriftiness/cheapness (spend a
Saturday coding).


Alan

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Yahoo
> Sent: Tuesday, January 06, 2009 10:54 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?
>
> Maybe. "Complicated" is a very subjective term. It seems
> unlikely that even if a guy had the software and hardware to
> program the CPLD he would make the required effort just to
> save $29, or even $100 (assuming three servos).
> There is a lot more to it than just designing the logic and
> programming the chip.
> --
> Phil Mattison
>
> ----- Original Message -----
> From: Jon Elson <elson@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, January 06, 2009 10:18 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?
>
>
> > Yahoo wrote:
> > > I would agree. I've thought a lot about this problem and
> there is no
> > > way
> to
> > > do it without a lot of very complicated logic because you
> have to be
> able to
> > > resolve direction changes anywhere within your reduced-frequency
> > > pulse train. It could be done but you would need an FPGA.
> Not cost-effective.
> > >
> > I'm quite sure it could be done in a Xilinx XC9536 CPLD which costs
> > about $4 and runs on 5V.
> > Of course, if you don't know how to program one, there is a learning
> curve.
> >
> > Jon
> >
> > ------------------------------------
> >
>
>
>
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