Baby Lock Crown Jewel II (BLCJ18-2) Manual - Manual (Page 44)

37
NEEDLE
THREAD
BREAKS • Look for severe twisting of threads when approximately 12 to 15
inches has been pulled off, with the ends pinched together. Cot-
ton threads are particularly susceptible to dry rot or wet rot which
makes thread brittle.
• Test and set bobbin tension following instructions on (page18).
Next, set top tension following instructions on (page 20).
• Check that the machine is threaded correctly.
• Inspect for accidental double wrapping of thread on thread guides.
• Inspect the thread mast, making sure that the eyelets of the mast are
directly over the spools.
• Inspect the vertical positioning of the thread cones. Tipped cones
can dramatically affect thread tension and can cause breakage.
• Inspect for particles and remove any fuzz or debris.
• Make sure the bobbin is wound smoothly. If it appears to be okay,
then change the bobbin. The slightest hesitation of the bobbin rota-
tion can be the cause of dramatic tension change and thread break-
age.
• If needle shows damage, replace needle immediately. Make sure the
needle is installed to the top of the stop/sight opening in the needle
bar. Change the needle at least once per quilt.
• Replace the needle to one better suited for the thread. Use the
proper size needle.
Problem Cause Correction
Thread cones/spools
may have abraded
thread casing, severe
twisting or thread rot
Top and bobbin
tensions not balanced
The machine head
has been threaded
incorrectly or thread
spools are not
positioned correctly
Particles in tension discs
Bobbin rotation is
not smooth
Needle is burred, bent
or dull, or installed
incorrectly
Needle not suited for
thread