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The Needle Breaks
•
The needle is bent or not installed
properly
•
The needle hits the needle plate
Stitches are Puckered
•
Tension is not balanced
•
Needle too large for material
Stitch Quality is Poor
•
Tension is not balanced
•
Bobbin case is damaged, corroded,
dirty, et cetera
•
Moving the fabric or pressing the
foot pedal inconsistently
Tension is Poor
•
Lint caught under the tension
spring in the bobbin case
•
Poorly wound bobbin
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Corrective Measure
•
Replace or correctly insert the needle. Make sure that the needle
is pushed up inside the needle bar clamp until it can go no farther
(visually check that it is up to the top of the stop/sight hole above the
needle bar clamp screw). Failure to do so can cause damage in the
bobbin area and throat plate.
•
Correctly position the needle, needle plate or hopping foot. Replace
needle with a new one.
Correctice Measure
•
Balance the tension of the needle thread after ensuring the bobbin
tension is adjusted correctly. (See Bobbin Case and Bobbin Thread
Tension Adjustments and Top Thread Tension Adjustment.)
•
Replace the needle with a size better suited to the fabric.
Corrective Measure
•
Adjust the tension of the needle thread after ensuring the bobbin
tension is adjusted correctly (see Top Thread Tension Adjustment).
•
Since thread slides over the surface of the bobbin case at a high
speed, make sure the case is free of any lint or foreign matter that
could impede thread passage through the machine.
•
The My Speed setting should be adjusted to a value that will allow
you to sew comfortably and confidently with the foot pedal fully
depressed. Discover a method of holding the fabric that is most
comfortable.
Corrective Measure
•
Lint and other material can build up under the tension leaf spring and
begin to lift the spring. This reduces the spring's ability to compress
against the thread. By inserting a needle under the spring and clearing
out the lint, the bobbin tension will return to the previously set
tension.
•
If the bobbin is wound too tight or too loose it can lead to poor and
inconsistent tension. Make sure when the bobbin is wound that the
thread tension is not so tight that the wound bobbin thread feels hard
and causes the bobbin sides to bulge. It should also not be so loose
that the thread is spongy, which can cause the thread to tangle as it
unwinds.
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