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46
PERFORMANCE CHECK LIST
UPPER THREAD
BREAKS
LOWER (BOBBIN)
THREAD BREAKS
Upper thread is
not correctly
installed.
Lint is clinging to
the bottom of the
needle plate.
Spool of thread
is not correctly
installed.
Upper thread
tension is too
tight.
Lower thread
tension is too
tight.
Bobbin is not
threaded
properly in the
shuttle hook.
The combination
of needle size/
thread size/fabric
is incorrect.
The combination
of needle size/
thread size/fabric
is incorrect.
The combination
of needle size/
thread size/fabric
is incorrect.
Needle is
incorrectly
inserted.
Lower (bobbin)
thread is tangled.
Damaged or worn
needle is used.
Threading is not
correct.
Wrong needle is
used.
Upper thread is
tangled.
Threading is not
correct.
Needle is bent
or not sharp.
Lower threading
is not correct.
Thread tension is
incorrect.
Thread tension is
too tight.
Page 17
Page 16
No
No
Pages 20-21
Page 6
No
Pages 20-21
No
Page 14
Page 16
No
No
Page 6
Pages 12-17
No
Page 21
Page 20
No
No
Page 22
Page 6
No
Page 14
Page 12
No
No
Pages 43-45
Page 22
No
Page 6
No
Page 22
No
Page 16
No
No
No
No
No
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