Well Balanced
Tension
The top row of I’s in the illustration above show properly adjusted
tension. Slight variations will occur, depending on the fabric,
backing, thread type and letter size.
Bobbin Tension
Problem
The middle row of I’s in the illustration above shows little bobbin
thread. All the letters have the same problem, so the bobbin tension
needs adjustment. Bobbin tension, since it is controlled by one
tensioning mechanism, will be consistent from one needle to the
next. In this example, the tension should be looser.
Top Tension
Problem
The bottom row of I’s in the illustration above show letters that look
quite different from one another. Top tension will vary from needle
to needle, since each needle tension is controlled by three different
tensioning points. Letters #1, #2 and #7 show too much bobbin
thread; letters #3, #4 and #9 have hardly any bobbin thread
showing; letters #5, #6 and #8 show properly adjusted tension.
1-20 X Series Mechanical Guide
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