On Sun, Nov 07, 2004 at 07:58:52PM -0500, Charles Lepple wrote: > On Sun, 7 Nov 2004 15:14:29 +0000, Karel Kulhavy <[EMAIL PROTECTED]> wrote: > > And a Gray-code readout strip (graycode is simple - take a normal binary > > code > > and derivate it from left), use it in feedback loop and you get > > unprecedented > > performance - or not? :) > > I'm going to hazard a guess that if you build an incremental encoder > yourself (as the above description reads), you are probably going to > sacrifice more accuracy than you would lose (due to backlash) by using > a low-cost X-Y table and gearing down some brush motors. (Unless, of > course, you can find excellent-quality encoder read heads from some > surplus catalog.)
What abut exposing the codes on a sheet of document film, epoxying to a glass plate and using linear CCD for readout? Cl< > > -- > - Charles Lepple