16
Model 8300
Adjusting Thread Tension
Upper Thrtead Tension:
The standard upper thread tension should be 51 to 59 grams when the tension dial
is set at “3”, measured with a #50 polyester thread being pulled at approximately 110
mm/sec. in the direction of arrow.
polyester sewing thread
#50 (White)
(A)
(B)
1. Set the tension dial at " 3 ".
2. Lower the presser foot.
3. Remove the face cover unit (See P. 3).
3. If the thread tension is more than 59g, turn the lead screw
in the direction (B).
4. If the thread tension is less than 51g, turn the lead screw
in the direction (A).
(C) Pulling direction: (Pulling speed 110 mm/ Sec.)
(C)
Bobbin Thread Tension:
The standard bobbin thread tension should be 9 to 11 grams measured with a #50 polyester
thread being pulled at approximately 50 mm/sec. in the direction of arrow.
Adjust the bobbin thread tension by turning the
adjusting screw .
(A) If the thread tension is more than 11 g
........turn the screw in the direction of “A”.
(B) If the thread tension is less than 9 g
........turn the screw in the direction of “B”
Pulling direction: (Pulling speed 50 mm/ Sec.)
(A)
(B)
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