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Sailrite Fabricator Guidebook
| 40
The correct combination of thread tension
(
Figure 71
)
results in a stitch that looks identical
on both sides of the material (i.e., the knots of
the stitches are pulled into the fabric and are no
more visible on the top than on the bottom).
When stitch tension is a problem, it is usually a
consequence of too much or too little tension on
the upper thread.
Tension changes to the bobbin thread should
only be made when upper tension changes
alone do not solve stitch tension problem. In
general, bobbin tension requires just about a
two-ounce drag on the thread (similar to what
you feel when pulling dental floss off a spool).
Note:
Always set the machine with too little
tension first and then slowly increase the upper
tension to the point that the knots just disappear
on the bottom side of the fabric.
Adjusting Bobbin Thread Tension
Knots pulled to top:
1. Decrease upper tension (
E
)
2. Increase bobbin case tension (
F
)
Knots centered — Perfect Stitch
Knots visible on bottom:
1. Increase upper tension (
G
)
2. Decrease bobbin case tension (
H
)
71
E
G
H
F
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