Bernette b68 AIRLOCK - Sewing Test; Performing Sewing Tests

Sewing Test
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2022-05 EN 50400685.00A.04
8 Sewing Test
To check the optimal setting, a sewing test should be sewn on a spare piece of the fabric used for your
project.
The default values of the stitches represent recommendations that work for most standard applications.
Depending on the result of the sewing test, fine adjustments for stitch optimization are possible.
8.1 Perfoming a Sewing Test for an Overlock Stitch
Prerequisite:
• The sewing start has been performed.
> Place the fabric under the presser foot to the front of the knife so that the desired seam allowance is cut
off.
> Press the foot control and sew slowly. Guide the fabric gently as the machine automatically feeds the
material.
> Sew beyond the fabric end such that a thread chain is formed.
> Pull the thread chain over the thread cutter.
> Assess the sewing test and make any necessary adjustments until the stitch setting matches the material
combination.
8.2 Perfoming a Sewing Test for an Coverstitch
Prerequisite:
• The sewing start has been performed.
> Raise the presser foot.
> Place the fabric under the presser foot such that the presser foot lies completely on the fabric.
> Lower the presser foot.
> Press the foot control and start sewing slowly. Guide the fabric gently as the machine automatically feeds
the material.
> Do not sew beyond the end of the fabric.
> Set the needles to topmost position.
> Raise the presser foot.
> Pull the needle thread between the fabric and the presser foot to the back with the coverstitch lock tool
and cut it.
> Pull the sewing project to the back left and cut the looper thread.
– The seam end is secured.
> Assess the sewing test and make any necessary adjustments until the stitch setting matches the material
combination.
8.3 Perfoming a Sewing Test for an Chainstitch
Prerequisite:
• The sewing start has been performed.
> Raise the presser foot.
> Place the fabric under the presser foot such that the presser foot lies completely on the fabric.
> Lower the presser foot.
> Press the foot control and sew slowly. Guide the fabric gently as the machine automatically feeds the
material.
> Sew beyond the fabric end such that a thread chain is formed.
> Raise the presser foot.
> Pull the sewing project to the back left and pull the threads over the thread cutter.
– The seam end is secured.
> Assess the sewing test and make any necessary adjustments until the stitch setting matches the material
combination.