... length. The drafting is the optimal design. FA507 Ring Spinning Machine1. High quality :Able to produce ... speedadjusting inverter. During the spinning process, the spindle speed can be changed automatically or manually.4. ... Convenient operation and management Spindle gauge(mm)70mmSpindle number504,492,480,456,444 ... ,420,408,396,384,372,360,96 Ring diameter(mm)38,42,45Tube length(mm) ...