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4. PREPARATION BEFORE SEWING
23
BAS-300G, BAS-311G, BAS-326G
4-5. Thread tension
[Thread tension reference]
Specifications
Heavy-weight materials
(-01[])
Medium-weight materials
(-02[])
Seatbelt (-03[])
Upper thread #20 or similar #50 or similar #4 or similar
Lower thread #20 or similar #50 or similar #4 or similar
Upper thread tension (N)
1.4 − 1.8 0.8 − 1.2 1.2 − 2.0
Lower thread tension (N)
0.2 − 0.3 1.0 − 1.5
Pre-tension (N)
0.1 − 0.6 0.1 − 0.3 0.3 − 0.6
Needle DP x 17 #19 DP x 5 #16 DP x 17 #25
Normal sewing speed 2,000 sti/min 2,000 sti/min 1,300 sti/min
4-5-1. 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.
4-5-2. 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 40 mm.
2536Q
Stronger
Weaker
2153B
Weaker
Stronger
Weaker
Stronger