SINGER 2250 TRADITION - Manual (Page 22)

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Thread Tension
Upper thread tension
Basic thread tension setting: "4"
To increase the tension, turn the diai to the next number up.
To reduce the tension, turn the diai to the next number down.
A. Normai thread tension for straight stitch sewing.
B. Thread tension too ioose for straight stitch sewing. Turn
diai to higher number.
C. Thread tension too tight for straight stitch sewing. Turn diai
to iower number.
D. Normai thread tension for zig zag and decorative sewing.
Correct thread tension is when a smaii amount of the upper
thread appears on the bottom side of fabric.
Lower thread tension
To test the bobbin thread tension, remove the bobbin case
and bobbin and hoid it by suspending it by the thread. Jerk it
once or twice, if the tension is correct, the thread wiii unwind
by about an inch or two. If the tension is too tight, it does not
unwind at aii. If the tension is too ioose, it wiii drop too much.
To adjust, turn the smaii screw on the side of the bobbin case.
Please note:
- Proper setting of tension is important to good sewing.
- There is no singie tension setting appropriate for aii stitch
functions, thread or fabric.
- A baianced tension (identicai stitches both top and bottom)
is usualiy oniy desirabie for straight stitch construction
sewing.
- 90% of aii sewing will be between "3" and "5".
- For zig zag and decorative sewing stitch functions, thread
tension should generally be less than for straight stitch
sewing.
- For all decorative sewing you will always obtain a nicer stitch
and less fabric puckering when the upper thread appears on
the bottom side of your fabric.