100 dpi is still an order of magnitude below the 1/1000" he is looking
for.  10x mechanical magnification without backlash is doable, but not
trivial.

Sherpa Doug

> -----Original Message-----
> From: Peter L. Peres [mailto:plp@ACTCOM.CO.IL]
> Sent: Thursday, August 02, 2001 6:18 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]:DRO using old PC mouse
>
>
> > resolution
>
> The resolution can be pretty good. A normal mouse has 24 to 48 slots
> (varies) and a mechanical multiplication ratio of x 10 or so. The real
> resolution is near 100 dpi with the original ball & axle. If
> you drive the
> axle directly you just count the slots and arrange for one rotation to
> satisfy your resolution requirements. All quadrature encoders
> resolve 2 x
> the number of slots. Therefore 30 slots = 60 distinctly
> discernible axle
> positions.
>
> Several people have used mice in DIY CNC machinery. Some have
> used them as
> is (like me), connected to a PC serial port.
>
> Peter
>
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>

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