Did some research.? Seems it¡¯s 600 PPR and the encoder suggested doesn¡¯t produce the Z index pulse which makes sense for just using encoder pulses to generate stepper motor pulses.
?
I found this one which can come in NPN, PNP and various supply voltages along with encoder resolutions and best of all the Index pulse.
The Arduino based electronic gearing require a multi-line encoder on the spindle in order to apply an A/B fraction to create stepping pulses that track the encoder.? IIRC it has to be an 800 line encoder.