Lower Thread Tension; Upper Thread Tension; Thread Take-Up Spring Height; Thread Take-Up Spring Tension - Brother BAS-343E Instruction Manual

5-6-2. Lower thread tension

Weaker
Set the lower thread tension to as weak a tension as pos-
sible and so that the bobbin case drops by its own weight
when the end of the thread is held. Turn the adjusting
screw q to adjust the tension.
NOTE
If the lower thread tension is too weak, it may not
be possible to cut the lower thread properly during
thread trimming.

5-6-4. Thread take-up spring height

8 10 mm
Loosen screw r and turn the entire thread take-up unit
to adjust so that the height of the thread take-up spring is
8 - 10 mm.
Stronger
Lower
Higher

5-6-3. Upper thread tension

Turn the tension nut w (main tension) to adjust the ten-
sion as appropriate for the material being sewn.
Furthermore, turn the thread nut e (sub-tension) to ad-
just the remaining length of upper thread to 35 - 40 mm.

5-6-5. Thread take-up spring tension

Adjust the thread take-up spring tension by turning the
tension stud t with a screwdriver.
BAS-343E
5. Correct use
Stronger
Weaker
Stronger
Weaker
Stronger
Weaker
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