Jon Elson wrote: > Kirk Wallace wrote: >> On Mon, 2008-07-28 at 00:33 -0500, Jon Elson wrote: >> ... snip >> >>> you might be >>> able to cobble up a substitute by making a disc with a narrow >>> slot and one of those U-shaped optical sensors from a floppy drive. >> >> I have thought about this, but I wonder how accurate these are. If you >> want to resolve .0002", I think you typically need angular accuracy >> to .16 degrees. I guess I could try it to find out. >> > I came up with .36 degrees. A good-sized disc with a > narrow-enough slot should work. Basically, you are making a > 1000 line resolution encoder, but with only one line.
Is that true? Since you always approach the home position in the same direction, the width of the slot shouldn't matter at all. You should just be looking at the leading edge. Ken > > Jon > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
