Thread Tension - Singer HEAVY DUTY 4423 Manual

Thread Tension

Upper thread tension
Basic thread tension setting: "4". (1)
To increase the tension, turn the dial to the next number up. To reduce the
tension, turn the dial to the next number down.
A. Normal thread tension for straight stitch sewing.
B. Thread tension too loose for straight stitch sewing. Turn dial to higher number.
C. Thread tension too tight for straight stitch sewing. Turn dial to lower number.
D. Normal thread tension for zig zag and decorative sewing. Correct thread
tension is when a small amount of the upper thread appears on the bottom side
of fabric.
If the thread is looping or birdnesting on the underside of the fabric, this is an
indication that the upper machine tension is not threaded correctly.
The bobbin tension has been set correctly at the factory, so you do not need to
adjust it.
• Proper tension setting is important for strong seams.
• There is no single tension setting appropriate for all stitch functions, thread
or fabric.
• A balanced tension (identical stitches both top and bottom) is usually only
desirable for straight stitch construction sewing.
• 90% of all 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.
• If the thread is looping or birdnesting on the top of the fabric,this is an
indication that the bobbin thread has not been threaded correctly.
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