SINGER S18 - Manual (Page 16)

16
The needle thread and bobbin thread should interlock in
the center of two layers of the fabric in straight seams.
Test the bobbin thread tension by first holding the end of
the bobbin thread and suspending the bobbin case as
illustrated. Then, flick your wrist once or twice to check
the drop of the bobbin case.
If the thread comes out of the bobbin case continuously,
and the bobbin case keeps falling, the bobbin thread
tension is too loose.
Make a slight adjustment by turning the screw clockwise
with the small screwdriver.
q To tighten
If the thread does not come out of the bobbin case at all,
the bobbin thread tension is too tight.
Make a slight adjustment by turning the screw
counter clockwise with the small screwdriver.
w To loosen
The bobbin tension is set correctly if the bobbin drops
but then stops.
q
w
Needle thread tension is too tight:
If the bobbin thread
r shows through on
the right side of the fabric q and it feels
bumpy, loosen the needle thread tension
by turning the dial to the left.
q Right side of the fabric
w Wrong side of the fabric
e Needle thread
r Bobbin thread
Needle thread tension is too loose:
If the needle thread
e loops on the wrong
side of the fabric w , tighten the needle
thread tension by turning the dial to the
right.
q
q
w
w
e
r
Balanced Needle Thread Tension
Adjusting Bobbin Thread Tension
Adjusting Needle Thread Tension
HOW TO BALANCE THREAD TENSIONS
Different threads and fabric types can cause irregular tension. Before making adjustments determine closely that the
machine is threaded correctly and the proper needle is being used.