SINGER W711 - Manual (Page 11)

10 ADJUSTING THE TENSIONS
Always adjust the upper tension with- the presses foot down,
as the tension is released when it is raisea.
l o
increase tne
tension on the upper thread, turn dial (Fig. 15)
t o
the right, or
clockwise; to decrease, turn to the left. The higher the number
on the dial the tighter the tension. Before adjusting lov/er tension
be sure that the machine is threaded properly.
When it is necessary to change the bobbin tension, turn
the small screw (Fig. 17) on side of the bobbin case clockwise to
tighten, counterclockwise to loosen.
Fig. 16A Fig. 16B
When the upper and under tensions are properly
balanced, a perfect stitch will be formed with both
threads interlocking in fabric (Fig. 16-A).
When the upper tension is too tight, the lower
thread is pulled up over the upper thread which is
lying flat on the fabric (Fig. 16-B).
When the upper tension is too loose, the upper
thread forms loops over the lower thread lying flat
on the fabric (Fig. 16-C).
Fic. 15
Fig. 16C