The ground pivot shaft is pressed in the spindle frame. Linear ball bearings which ride on the pivot shaft are fitted inside of regular ball bearings to allow the spindle head both rocking and pumping movement on the pivot shaft. The bearing block mounts are milled flat and drilled and tapped for the bearing cap bolts and alignment pins. The left bearing block mount is tapped for the rocking return spring and the rocking stop.
Work capacity is 16.5 inch diameter. Thread cutting capacity is 1.5".