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2-Thread Overcast
Balanced Tension
The needle thread should resemble a straight stitch on
the topside (1) of the fabric. It will lock with the lower
looper thread on the fabric edge. The needle thread
should lie flat in a V-shape on the fabric underside (2).
The lower looper thread should lie flat on the topside of
the fabric and lock with the needle thread on the fabric
edge.
The needle thread is too loose.
If the needle thread (a) is pulled up over the fabric
edge to the topside of the fabric, increase the needle
thread tension and/or decrease the lower looper thread
tension.
Cover Hem
Balanced Tension
The needle threads resemble parallel rows of straight
stitches on the topside (1) of the fabric. The chain
looper thread should be slightly slack on the underside
(2). DO NOT set the stitch length dial below 2.5.
Heavier weight fabrics will require a longer stitch
setting.
The needle thread is too loose.
If the needle thread (a) is too loose and loops appear
on the underside of the fabric, increase the needle
tension (red).
The needle threads are too tight.
If fabric puckers form, the needle threads are too tight.
Decrease the needle tensions.
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