5. PREPARATION BEFORE SEWING
24
BAS-342G
5-6. Thread tension
Thread tension reference
Upper thread #20 or similar
Lower thread #20 or similar
Upper thread tension (N)
1.4 − 1.8
Lower thread tension (N)
0.3 − 0.4
Pre-tension (N)
0.2 − 0.4
Needle DP×17＃19
5-6-1. Lower thread tension
Adjust the thread tension to the weakest possible tension by
turning the thread tension nut (1) until the bobbin case will not
drop by its own weight while the thread end coming out of the
bobbin case is held.
5-6-2. Upper thread tension
1. Turn the tension nut (1) (main tension) to adjust the
tension as appropriate for the material being sewn.
2. Use the tension nut (2) (sub tension) to adjust the upper
thread trailing length to about 42 mm.
2536Q
Stronger
Weaker
4003M
Weaker
Stronger
Weaker
Stronger
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