Re: Quadrature Divider ?

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.
--
Phil Mattison

----- Original Message -----
From: Mariss Freimanis <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, January 06, 2009 12:43 AM
Subject: [CAD_CAM_EDM_DRO] Re: Quadrature Divider ?


> Alan,
>
> Your best bet is to go to digikey.com and order yourself up some
> AMT-102 encoders. They are $29 in single quantity and the cover every
> possible resolution you have in mind from 48 lines per revolution to
> 2,048, all DIP-switch settable. They are terrific encoders and we have
> tried them. Best thing since sliced bread.
>
> Mariss
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "alanrothenbush" <alan@...> wrote:
> >
> > I got a good deal .. sorta .. on half a dozen servo motors, intended
> > for use with some Gecko 320s (already purchased).
> >
> > The "sorta" part comes from the fact that I must have misread the
> > part number; they do not have 250 count encoders, as expected, but
> > 2,000 count encoders, meaning that even with my fastest computer,
> > they run way too slow.
> >
> > Now I could just purchase some Gecko G902s but I'm afraid that's not
> > really an option for budgetary reasons; this is just for hobby use.
> >
> > Some of the options I'm considering are
> >
> > . a poor man's pulse multiplier, kinda like a G902, only without the
> > PLL fanciness; maybe a PIC that outputs 8 pulses for each incoming
> > step pulse. Easy, but I wonder how important it is that the pulses
> > be nicely spaced ...
> >
> > . a quadrature divider .. maybe a PIC doing a bunch of counting.
> >
> > (Here's a question .. would a flip-flop wired as a divide-by-two work
> > as a simple divider ? And if so, couldn't a guy cascade three of
> > them for a divde-by-eight ?)
> >
> > . one of the USB pulse engine options like the ncPOD or
> > SmoothStepper
> >
> >
> > Any thoughts, opinions or circuits gratefully accepted.
> >
> >
> > Alan
> >
>