We are looking at various CNC lathes of Swing over tool post of 450mm and ABC of 5000mm. The spindle Bore is 105 mm. We were offered a Lathe with Fanuc Servo Motor for Spindle with Poly 'V' Belt Drive imparted to the Spindle. The claim was that the AC Servo motor is of very high torque rating and no gear is necesary. Another model is with Geared Spindle. I would like to know whether Poly Vee belt drive is enough when machining Jobs weighing upto 3.5 tons or it is better to go for Geared drive. Thanks for all the responses.