Page 22
Baby Lock Tiara III Instruction Manual
3. Pull the fabric 3 to 4 inches away while holding the needle thread.
4. Bobbin thread will pull up and through to the top, allowing you to grasp the loop and pull it to the
desired length.
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 up from your hand. While gently moving the finger in a left to right motion (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 tension adjustment is made (see Figure 18). Turn
clockwise to tighten and counter-clockwise to loosen the bobbin case tension. Turn the tension adjustment screw in
small increments. Check the bobbin tension every time a new bobbin is inserted.
To tighten bobbin case tension
The bobbin case tension is
too loose
if it will not lift
up onto its side. Turn adjustment screw clockwise to
tighten. The bobbin case adjustment screw requires very
small adjustments. Think of the “tick of a clock”. Adjust,
then check. Adjust and check again.
To loosen bobbin case tension
The bobbin case tension is
too tight
if it lifts out of your
hand. Turn adjustment screw counter-clockwise to
loosen. The bobbin case adjustment screw requires very
small adjustments. Think of the “tick of a clock”. Adjust,
then check. Adjust and check again.
Figure 18
Top Thread Tension Adjustment
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IMPORTANT
: Top thread tension should be adjusted only after the bobbin case foundation tension
adjustment is made.
Puckering, gathers and thread breakage occur when the top tension is too tight. Loops and thread nests occur
on the back when the top thread tension is too loose (see page 23, Figure 19). Tension may need to be adjusted,
depending on the fabric, thread or batting used in each project.
As you change the top tension, the value in the tension indicator box on the Main Screen increases or decreases in
increments of five. When you are happy with the tension, note the top tension value for that type of thread (brand,
weight and color) so you can quickly and easily set the tension when you use this thread again in the future.
Unlike the bobbin case adjustment, which requires minute adjustments (like the ticks of a clock), the top tension
knob may require turns anywhere from one quarter of a turn to two to four turns to achieve balanced tension.
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