Adjusting Tensions - Bernina Serger Owner's Workbook

Adjusting Tensions

Fabric ................................................... 6 pieces firm fabric, each 3" x 6"
......................................................... 1 piece of lightweight cotton, 3" x 4"
Needle ............................................................................. 80/12 Universal
Thread ............................................................... 4 cones of serger thread
.......................................................................... (yellow, red, green, blue)
Presser Foot .............................................................................. standard
Stitch ............................................................................ 4-thread overlock
Lower Looper - Increased Tension
Thread the serger for a 4-thread overlock stitch using thread colors
to match the color-coded threading path on the serger.
Fold each piece of the firm fabric to 1½" x 4" and set aside.
Locate the thread tension levers on the front of the serger. From left
to right, these levers adjust tension for the Left Needle, Right Needle,
Upper Looper, and the Lower Looper.
Adjust the lower looper thread tension lever to 7 to increase the
tension on the looper thread.
Place the first piece of folded fabric under the presser foot with the
fold to the right and serge to the end of the fabric, cutting off the fold.
Examine the sample. The looper threads do not lock on the edge of
the fabric. The upper looper thread is pulled tightly to the back of the
stitch. The left needle thread may be pulled to the back of the stitch.
Trim, label, and mount the sample.
Lower Looper - Decreased Tension
Change the lower looper thread tension lever to 2 to decrease the
tension on the looper thread.
Serge the second piece of folded fabric, cutting off the fold.
Examine the sample. The looper threads do not lock on the edge of
the fabric. The lower looper thread is visible on the face of the fabric.
The looper threads are very loose.
Label, trim, and mount the sample. Return the thread tension levers
to normal.
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