Regulating The Thread Tension - Pfaff 92 Instruction Book

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The bobbin thread tension has been set for a medium grade and need
not be adjusted for all ordinary sewing operations. If a special sewing
operation should require a looser or tighter tension, turn the small
knurled screw on the bobbin case with the tip of your thumb as follows:
Turn it left
for looser tension.
-
Turn it right
for tighter tension.
Determine whether the bobbin thread tension is set for a medium grade
by holding the thread end between thumb and forefinger and letting the
bobbin case hang freely. The tension should be strong enough to keep
the bobbin case from being pulled down by its own weight. However, as
you jerk your hand slightly, the bobbin case should gradually slide
down. Do not turn the knurled, screw too far to the left to keep it from
falling out. Choose the loweF tension slightly stronger when doing
ornamental stitching to be sure you always have a neat satin stitch on
the right side of the fabric.
The upper tension is so designed that all grades of
tension
—
loose to tight
—
can be covered with one
complete turn of the tension dial. The numbers on
the tension dial indicate different degrees of tension.
The higher the number, the greater the tension. Only
in very rare cases will it be necessary to reset the
tension. For ordinary sewing, the upper tension
should be set between 3 and 5.
V
A
Your upper tension has a third tension disc for two
needle work.
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