An Omron 2000 line encoder was fitted for spindle index. In this way, the control knows when the spindle is in the correct position to engage feed to produce perfect threads.
This lathe has a shaft which is geared 1:1 with the spindle which is used to drive the feed gearbox. But since the gearbox was removed, this was the ideal place to install the encoder.
Once the encoder was fitted, the spindle speed now shows up on the control screen. It seems that the spindle speeds shown on the lathe panel are incorrect, and the lathe runs about 10% faster.
Now the encoder is in operation, cutting threads is quite simple using the Intercon CAM built in to the Centroid CNC12 software.
