VALBERG 972697-VB-MAC Consignes D'utilisation page 53

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Product usage
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Thread tension
After having selected the correct needle and thread combination for the fabric being used, you
may need to adjust the sewing machine's tension in order to ensure the correct stitch balance.
A stitch is well balanced when the upper and lower threads appear the same on the fabric.
Your machine is equipped with an adjustable thread tension dial. It allows tension to be exerted
on the upper and lower threads as they pass through the machine to form a stitch.
Too much tension will produce a tight stitch which will cause the fabric to pucker.
Too little tension will produce a loose stitch.
When a uniform tension is exerted on the two threads, a regular stitch, i.e. a well-balanced
one, is obtained.
The machine's thread tension dial is numbered 1 through 9, and settings 3, 4 and 5 are marked
with a small square around the number to indicate the adjustment range at which most of
your stitches will be made.
How does the tension work?
To help you understand the role tension plays on fabrics and threads, try this simple test.
Take 2 pieces of a medium-weight woven fabric - in a solid, light colour - that measure approx.
15 cm long.
Place a size 14 needle in the machine.
Thread the top of the machine with an all-purpose thread (darker colour) and put the same
type of thread (lighter colour) in the bobbin.
Set the machine to stitch No. 3; one of the straight stitch options.
Sew the two pieces of fabric together, starting with an upper thread tension set to 1. Whilst
sewing, slowly turn the tension dial from 1 to 9.
Sew another row by returning the handwheel to 1. You should see a balanced stitch on each
row halfway between the start and end.
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