Hardinge Lathe CNC Retrofit/Conversion

[m_c]

There is most likely an independent spindle encoder, which will connect directly to the controller.

If you look at the Hickory wiring diagram, it makes mention of a spindle encoder cable (DB9 connector at lower left of the hickory board)

[glbreil]

The Fanuc spindle encoder connects directly back to the drive through the CN2 cable mentioned on the Centroid/Fanuc Spindle I/O. If it requires a separate encoder to get feedback to the controller, it might be easier to just use a simple VFD rather than the Fanuc drive.