Weaver 303 - Adjusting Motor Speed; Adjusting Thread Tension

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ADJUSTING THREAD TENSION
ADJUSTING MOTOR SPEED
You may want to change the top speed of the machine
depending on your project. For more intricate projects,
a slower speed is generally better. A faster speed may
be more desirable on larger projects.
1. Locate the Speed Dial on the servo motor
and set to the desired speed (Figure 27).
Correct
Needle and bobbin threads are
equally drawn into material,
resulting in a perfect stitch.
Wrong
When the knot is on the top of the
material, decrease upper tension by
turning the Top Thread Tensioner
counterclockwise (Figure 28). If
decreasing the upper tension alone
does not solve the issue, increase
Bobbin Case Tension by tightening
the screw clockwise (Figure 29).
Wrong
When knot is on the bottom of
material, increase upper tension
by turning the Top Thread Tensioner
clockwise (Figure 30). If increasing
the upper tension alone does not
solve the issue, decrease Bobbin
Case Tension by loosening the
screw counterclockwise (Figure 31).
Figure 27
Figure 28 Figure 30
Figure 29 Figure 31
Tighten screw on Tighten screw on
the right clockwisethe right clockwise
Loosen screw on the Loosen screw on the
right counterclockwiseright counterclockwise