Hi Joe, the master axis rotates at 64.8 rpm (fixed speed) equivalent to 2700 pulses / second, read as encoder frequency (2500 PPR). The second axis has the same encoder (2500 ppr)
. I made a PID routine so that the slave axis is equal to the master frequency, the only thing missing is the correction so that the two axes are synchronized. (and your inductive sensors can match), the timing accuracy should be at least acceptable.
The system is a coated machine, which consists of a varnishing roller (slave axis) which prints varnish on aluminum sheets, these aluminum sheets are entered into the printing area through a transmission chain (master axis). The objective is that the impression coincides with the beginning of the aluminum sheets with a tolerance of 1 millimeter. I enclose a reference image