15
Learn your Platinum 770
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Thread Tension
Use the recommended thread tension
setting given on the GraphicDisplay.
You can adjust the top thread tension
for special fabrics and/or techniques. To
adjust, turn the numbered tension dial
(a). The higher the number the tighter
the tension. Normally top thread tension
is set to around 4.
When sewing buttonholes and decorative
stitches set thread tension to around 3.
When topstitching with a coarse thread in
thick fabric, increase the tension to 7-9.
Correct and Incorrect Thread Tension
To understand the correct thread ten-
sion, sew a few sample zigzag stitches at
different settings.
1. Begin with a tension that is too
loose, i.e. set at the lowest number.
The lower thread will lie straight
and the upper thread will be drawn
down on the underside.
2. If you set the tension at the highest
number, the opposite will occur, and
the seam may pucker and or thread
breaks.
3. The correct thread tension is set
when the threads interlock in the
middle of both layers of material or,
in the case of decorative stitches, on
the underside.
Make a few tests on a scrap piece of the
fabric you are going to sew and check
the tension.
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