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30
MINOR
FAULTS
AND
THEIR
CORRECTION
Breaking
of
upper
thread
1.
Incorrect
threading.
2.
Defective
needle
or
needle
inserted
incorrectly.
3.
Upper
thread
tension
too
tight.
4.
Needle
rubbing
against
presser
foot
or
other
attachments.
5.
Needle
eye
too
small
for
thread
used.
6.
Knot
in
sewing
thread.
7.
Hole
in
the
needle
plate
damaged
or
rough.
Breaking
of_lower
thread
1.
Incorrect
threading
of
the
bobbin
case.
2.
Lower
thread
tension
too
tight.
3.
Bobbin
wound
too
full.
Breaking
of
needle.
1.
Pulling
the
fabric
while
machine
is
sewing
thus
causing
needle
to
bend
and
strike
the
needle
plate.
2.
Using
bent
needle.
Machine
slipping
stitches
1.
Using
bent
or
blunt
needle.
2.
Needle
inserted
incorrectly.
3.
Needle
threaded
improperly.
4.
Using
wrong
size
needle.
5.
Pressure
on
presser
foot
insufficient,
especially
when
sewing
heavy
material.
Uneven
stitches
1.
Presser
foot
not
resting
evenly
on
material.
2.
Feed
dog
not
adjusted
high
enough.
3.
Stitch
length
too
short.
4.
Pulling
the
cloth
while
the
machine
is
running.
5.
Needle
too
fine
for
material
or
thread
too
heavy.