2022-Ultrafeed LSZ Guidebook - Flipbook - Page 27
Advanced Thread
Tension Adjustment
38
Knots pulled to top
Before moving on, please reference p. 4
to ensure proper needle and thread size
are being used for your application.
Tension changes to the bobbin thread should only be
made when upper tension changes alone do not solve
stitch tension. In general, bobbin tension requires
just about a 2-ounce drag on the thread (similar to
what you feel when pulling dental floss off a spool).
If knots are pulled to the top (38) and you can’t
loosen the upper tension knob (36) any more,
remove the bobbin case from the machine and
increase the bobbin case tension by tightening
the tension adjustment screw (A). Tighten in 1/4
increments, testing the drag on the thread after
each 1/4 turn until proper tension is achieved.
A
39
Knots visible on bottom
If the knots are pulled to the bottom (39) and you
can’t tighten the upper tension knob (36) any more,
remove the bobbin case from the machine and
decrease the bobbin case tension by loosening
the tension adjustment screw (B). Loosen in 1/4
increments, testing the drag on the thread after
each 1/4 turn until proper tension is achieved.
B
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