Re: encoders

I know this has been covered in the past, unfortunately I'm in the process of
trying to get Linux up on the comp. with most of my links, so if anyone can
tell me.....
I have a bunch of encoder disks with some kind of opti diode sensor, still
trying to figure out the input output, with very poor resolution 40 slots per
rev. if I offset phase them equally and stack five of them 200 spr and run
them, 5 to one, reduction rate of stepper to ball screw, and put the output
in quadrature would that be sufficient resolution? if so how do i get
quadrature output? I know what it is, but am unfamiliar with how to make the
circuit.
Thanx again, one and all!
Tracey
PS I can start putting my name in the subject box so you know when to avoid
the mail :o)