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SECTION 4. PERFORMANCE PROBLEMS CHART
What to Do When
PROBLEM
PROBABLE CAUSE
Irregular Stitches
Breaking Needle
Bunching of Thread
Puckering
Incorrect size needle.
improper threading.
Loose upper thread tension.
Pulling fabric.
Loose presser foot.
Unevenly wound bobbin.
Nicks or burrs at hole ot needle plate.
Pulling tabric.
Incorrect size needle.
Incorrect setting of needle.
Loose presser toot.
Upper and lower threads not drawn back under
presser foot before starting seam.
Incorrect thread tension.
Using two different sizes or kinds of thread.
Bent or blunt needle.
Loose presser toot.
Fabric too sheer or too soft.
CORRECTION
Choose Correct size needle for thread and fabric.
Rethread machine.
Tighten upper thread tension.
Do not pull fabric; guide it gently.
Reset presser foot.
Rewind bobbin,
Replace needle plate, or polish off burrs completely.
Do not pull fabric; guide it gently.
Choose correct size needle lot thread and fabric.
Reset needle.
Reset presser toot.
When starting a seam be sure to draw both threads under, and
back ot presser loot about 4"" and hold until a few stitches are
iormed.
Reset thread tension.
Upper thread and bobbin thread should be same size and kind.
Insert new needle,
Reset presser foot.
Use underlay of tissue paper,
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