Baby Lock A-LINE Lauren BL450A Getting To Know Manual page 10

It is easiest to become familiar with tension adjustments if you practice using different thread colors, that match to
tension dials to a higher number to tighten the tension or to a lower number to loosen the tension performance.
3 - or 4 - Thread Seaming
The upper and lower looper threads should interlock
right over the cut edge of the fabric. (Diagrams A-3
and A-4)
Looper Tension
the fabric OR if the fabric edge curls up, the
upper looper tension is too tight and the lower
looper tension is too loose.
(Diagrams B-3 and B-4)
underside of the fabric OR if the fabric edge
curls under, the lower looper tension is too tight
and the upper looper tension is too loose.
(Diagrams C-3 and C-4)
stitching, either both loopers are too tight OR
the stitch width may be too wide for
lightweight fabrics. (Diagram D)
Needle Tension
Sew a test seam and, if stitches are visible from
the right side of the fabric (Diagram F), tighten
left needle tension. If the seam begins to pucker
or draw up lengthwise, the needle tension is too
tight. (Diagram G)
On the 4-thread stitch, if the inside straight stitch
forms loops on the back side of the fabric, tighten
Tension Guidelines
Three-thread Seaming
A-3
B-3
C-3
D
F
8
Four-thread Seaming
A-4
B-4
C-4
G