Machines with Fanuc 5 controls would be 1977-1980. The servo motors will be black cap dc, the larger ones made by Gettys, drives will more then likely be scr, not transistor. They are rugged, but not fast, they also don't have tachs, the Fanuc control generated the analog tach signal for the drive, you must provide a tach signal to the drive or it will run away. As far as I know, this has been accomplished in LCNC. Encoders 0n black cap motors were usually 1024 cpr.
Most machines of that era used dc spindle motors with a dc drive and contactors for forward and reverse. I would double check, as far as I know , Ac drive technology was still a few years away. My guess is you probably have either a Fuji or Mitsubishi dc drive and motor . The first Fanuc AC spindle motors and drive showed up on the 6TB/6MB , these machines usually had yellow cap dc motors.
With a front and rear turret, the front turret will be X+ programming, the rear will be X- with G2 and G3 reversed.
There have been several similar type Mazak lathes from that era done with Lcnc , maybe one of the owners could lend some insight.
