Instruction manual

6.4 Adjusting the thread tension
6.4.1 Adjusting the hook thread tension
Caution: danger of injury!
Turn off the main switch.
Adjust the shuttle thread tension only when the sewing machine is
turned off.
–
Adjust the shuttle thread tension by turning the screw (1) with a
screwdriver. The screwdriver should be inserted through the
opening (2). The tension is increased by tightening the screw.
–
The thread tension should then be checked with a thread tension
gauge (dynamometer). Insert the thread as shown in the illustration
and pull in the direction of arrow (3).
The thread tension set at the factory depends on the selected
machine configuration (see table below). This tension setting is
suitable for typical s ewing processes. You should lower the tension
when working with materials which are soft and thin. If the seam
must be tightly sewn, then you should increase the tension while
simultaneously lowering the s ewing speed.
Average values for hook thread tension
Type of sewing Width of needle used
Nm
Thread tension in
grams
heavy 120-160 90
extra heavy 180-230 90
11
GB
1
2
3