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Bobbin Case and Bobbin Thread Tension
Adjustments
Inserting the Bobbin
NOTE:
Turn off the power switch
while inserting the bobbin case or
anytime your hands are near the
needle area.
1. Place the bobbin in the bobbin case so
that the thread pulls off clockwise when
viewing the open side.
2. Slide the thread through the slot and
under the tension spring leaving 5-6
inches of thread hanging loose.
Checking and Adjusting Bobbin Case Tension
The bobbin case tension is the foundation tension
for the entire machine. To test that bobbin tension
is correct, hold the bobbin case in the palm of
your hand with the open end facing up. Wrap the
thread around your index finger and lift the bobbin
case from your hand. While gently moving the
finger front to back (not up and down, which is not
consistent), the bobbin case should slide slowly
down the thread, like a spider on its web.
The small screw in the center of the tension spring
is where the adjustment is made. Turn clockwise to
tighten and counter-clockwise to loosen the bobbin
case tension. The bobbin case tension is TOO
LOOSE if it will not lift up onto its side. Turn screw
clockwise in very small increments to tighten.
Think of the “tick of a clock”. Adjust, then check.
Adjust and check again.
The bobbin case tension is TOO TIGHT if it lifts
out of your hand and does not slide down the
thread. Turn screw counterclockwise in very
small increments to loosen. Think of the “tick
of a clock”. Adjust, then check. Adjust and check
again.
Check the bobbin tension every time a
new bobbin is inserted.
TENSION
SPRING
