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R
8150
To
check
whether
the
tensions
are
correctly
bol
anced,
take
a
closely
woven
piece
of
fabric
and
sew
a
few
straight
and
zigzag
seams.
If
the
straight
stitches
are
tightly
drawn
in
on
bath
sides
of
the
fabric
(see
seam
sketch
III),
the
tensions
are
correct.
The
surest
way
to
double-check
this
is
by
examining
a
zigzag
seam.
If
the
zigzag
seam
is
equally
wide
on
surface
and
underside
of
the
fabric,
that
is,
if
the
threads
are
locked
exactly
at
the
zigs
and
zags
of
the
seam,
the
tension
adjust
ment
is
correct.
‘V
Ccea.t
7n.cicn
9
tdatj,n
Balanced
tensions
are
essential
for
sewing.
If
your
tension
is
correct,
you
will
have
perfect
seams
as
sketched
below
(III).
Sketch
I
—
The
threads
interlock
on
the
underside
of
the
fabric.
Cause:
Upper
tension
too
loose
or
lower
tension
too
tight.
Sketch
II
—
The
threads
interlock
on
the
surface
of
the
fabric.
Cause:
Upper
tension
too
tight
or
lower
tension
too
loose.
A
18