[sdiy] Looking for a mini rotary encoder with very low torque (servo type).. Optical mice.. a possible solution..

[Jean-Pierre Desrochers]

In fact all the new optical mice have a very small rotary encoder (3 pins)
used for the index finger to scroll on screens.
Opening this encoder and removing its inner detents
would make it very soft with almost no torque at all.

But the optical way would be best if I could rearrange
the transparent optical deflection plastic block of the led/sensor tandem
to be brought close the moving paper..



> -----Message d'origine-----
> De : Ben Stuyts <ben at stuyts.nl>
> Envoyé : 11 décembre 2024 10:30
> À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> Cc : synth-diy at synth-diy.org
> Objet : Re: [sdiy] Looking for a mini rotary encoder with very low torque (servo
> type)
> 
> I can’t help you with the encoder, but just an idea: can’t you use the sensor of
> an optical mouse? -> zero torque. Something like an ADNS-3050 although that
> one is obsolete now.
> 
> Ben
> 
> 
> > On 11 Dec 2024, at 16:09, Jean-Pierre Desrochers via Synth-diy <synth-
> diy at synth-diy.org> wrote:
> >
> > I'm looking for a very small (20mm or less body diameter) rotary
> > encoder with very low torque (servo type).
> > The low torque shaft is needed because it will turn by means of a
> > small wheel with rubber sides that will be put against a moving surface, turn
> and 'follow'
> > the moving surface.. no slipping allowed !
> >
> > The precision of steps/turn is not important.
> > But the higher will be best..
> >
> > I was thinking of using a dismantled PC mouse (rubber ball type) and
> > use one of the two  X/Y optical rotary encoders, but these PC mice
> > nowadays are hard to find.. So.
> >
> > I checked Digikey and Mouser but they have encoder too big for my
> > uses..
> > The smaller I found has 20mm in diameter..
> > https://www.digikey.ca/en/products/detail/nidec-components-corporation
> > /RES20D-50-201-1/6469509
> >
> > Any suggestions ?
> >
> >
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