Thread tension
The bobbin thread tension has been adjusted at
the factory and readjustment is usually not
required.
NOTE:
To test the bobbin thread tension, remove the
bobbin case and bobbin from the machine and
hold the bobbin case suspended by the thread.
Shake it once or twice. If the tension is correct,
the thread will unwind by about an inch or two.
If the tension is too tight, it will not unwind. If
the tension is too loose, the thread will unwind
for more than two inches. To adjust, turn the
small screw on the side of the bobbin case. (1)
Lower thread tension
Basic thread tension setting: “4”. (2)
To increase the tension, turn the dial up to a
higher number. To reduce the tension, turn the
dial to a lower number.
A. Normal thread tension.
B. Thread tension too loose.
C. Thread tension too tight.
Upper thread tension
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