How to sew a flatlock decorative seam:
A flatlock stitch is achieved by adjusting the tension of the
3-thread overlock stitch, sewing the seam and pulling the
fabric apart to flatten the seam. The flat lock stitch can be
used as a construction and decorative stitch or for
ornamentation only.
How to set up the machine:
1. Remove the left or the right needle.
2. Begin with the machine threaded and tension
balanced for the 3-thread overlock stitch.
3. Loosen the needle thread tension (green or blue)
generously.
4. Loosen the upper looper thread tension (orange)
slightly.
5. Tighten the lower looper thread tension (yellow)
generously.
Flatlocking a seam:
1. Place the fabric wrong sides together to sew a
decorative stitch on the right side of the garment.
2. Sew the seam, trimming the excess fabric.
3. The needle thread (green or blue) will form a “V” on
the underside of the fabric.
4. The lower looper thread will pull into straight line at
the fabric edge.
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