20 or 25um with a multiplierbox to make 1um has been pretty much standard
for many years.
j.
On Sun, Sep 4, 2011 at 4:48 PM, petr ruzicka <[email protected]> wrote:
> Thank you for the post, in the past I've implemented a 5 axis Router ,
> working in torque mode , AC servos (yaskawas ) all all-round with harmonic
> reductions on the 2 rotaries., without any probs, however the linear
> encoders give an extra piece to the problem.
> What resolusion (microns) should the scales be to be able to work properly?
>
>
> --- El Sáb 3/9/11, Viesturs Lācis <[email protected]> escribió:
>
> > De: Viesturs Lācis <[email protected]>
> > Asunto: Re: [Emc-developers] Linear scales
> > Para: "EMC developers" <[email protected]>
> > Fecha: Sábado 3 de Septiembre de 2011, 11:48
> > 2011/9/2 Jon Elson <[email protected]>:
> > >
> > > If you have a lot of backlash between the motor and
> > the scale (mostly
> > > would be worn ball nuts) then you
> > > will have a problem with a lot of servo "hunting".
> > >
> > > The only linear scale systems I am familiar with is on
> > some of Stuart
> > > Stevenson's large machines at MPM
> > > in Wichita, Kansas. I am sure they work well for
> > him. One of his
> > > machines has linear scales PLUS shaft
> > > encoders on the motors. That system is also working
> > well.
> >
> > I am in progress of implementing feedback from linear
> > scales. Since
> > there is significant (significant for closing feedback
> > loop
> > successfully) backlash in planetary gearbox, I am following
> > Stuart
> > Stevenson's wiki page on implementing 2 feedback devices
> > for single
> > joint. I also have resolvers on motors. I think that this
> > might be
> > useful also for You:
> >
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Combining_Two_Feedback_Devices_On_One_Axis
> >
> > Viesturs
> >
> >
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