Using a optical coder

[debutpic]

Ok but which is the fonction of green wire called "index"?

[dmairspotter]

Index usually gives a pulse at one particular point in each turn of the encoder, like a "home" signal.

[locko]

I do not know much about lathes but how about a microswitch on the direction lever (if it has one), or current sense a wire/wires going to the motor.

[Luciano]

Your single channel encoders are unidirectional or "tachometer" encoders.
(They are used to provide speed information).

Best regards,

Luciano

[debutpic]

and this model should be appropriate ????????

[Luciano]

Yes, this is the right one.

See this thread:

Decoding quadrature encoders
http://www.picbasic.co.uk/forum/showthread.php?t=1552

Luciano

[debutpic]

thank you Luciano
I will read all the thread and if I dont' understand all
I would ask you of another questions