"Mazlik" lathe: M12 thread using G76 @ LinuxCNC

First experiments with encoder. No M12 nut to test :( gcode: G21 G64 P0.05 F50 G01 Z0 X11 G76 P1.5 Z-15 I-5 J0.2 K0.812 L2 E0.812 H2 G01 X11 G00 Z30 M2 Encoder details: Encoder uses one infra LED and two infra photo-transistors (one for Index track and one for A track, B track is not used). Collectors and LED Anode are joined to *Sensor_VCC* input, Emitters lead to *Sensor_Index* and *Sensor_Phase_A* inputs, LED cathode leads to *Sensor_Cathode* input (*Sensor_Phase_B* input is left unconnected). Used photo-transistors differ, the one used for index needed to be biased by R2 for optimal operating range. Exact IC2 is SN74HC14N (ti). Interface board (JP4) is connected to the main board via X1 (LATHE_DATA). A track resolution is 50PPR.