Thread Tension; The Basic Setting; Perfect Stitch Formation; Upper Thread Tension Too Tight - Bernina 555 User Manual

Thread tension

The upper thread tension is set optimally at the BERNINA factory
and the sewing computer has been tested. Metrosene-/Seralon thread
size 100/2 (Company Mettler, Switzerland) are used for upper and lower
thread.
In case of using other types of sewing or embroidery threads, the optimal
tension may vary. Therefore it may be necessary to adjust the tension to suit
the fabric and the desired stitch pattern.
For example:
Metallic thread
Monofilament thread

The basic setting

̶ is indicated when the red line on the tension adjustment wheel is in line with
1
̶ the thread tension needn't be altered when sewing standard fabric
̶ for special fabric, the tension can be adjusted by turning the tension

Perfect Stitch Formation

The interlooping of the threads is in the material.

Upper thread tension too tight

The lower thread is pulled more up, i.e. to the right side of the material.
⦁

Upper thread tension too loose

The upper thread is pulled more down, i.e. to the wrong side of the material.
⦁
0365315.0.04_2015-05_Manual_B570QE-B555_EN
the marking 1
adjustment wheel to suit the material
to reduce the upper thread tension = turn tension adjustment wheel to 3-1
to increase the upper thread tension = turn tension adjustment wheel
to 5-10
Sewing preparation
Tension
approx. 3
approx. 2-4
Needle
90
80
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