Pfaff 285 Owner's Manual - Page 17

Balanced tensions are essential for sewing. Both tensions are correctly balanced if the needle and bobbin threads interlock in the center of the material. The bobbin thread tension is regulated by turning the small knurled screw on the bobbin case. Turn this screw right for a tighter tension, or left for a looser tension. If the same size threads are used in the needle and on the bobbin, there is no need to adjust the bobbin thread tension. This tension is set correctly if a slight resistance has to be overcome when pulling the thread. Numbers 0 to 10 indicate different degrees of tension on the upper tension dial. The higher the number, the tighter the tension. For ordinary sewing operations, the upper tension should be set at about 5. bottom to Upper tension too tight or lower tension loose. bottom top Upper tension too tight. too loose or lower tensic bottom * top