PERFECT STITCHING
Tension of upper and lower threads should be equal, just sufficiently strong to lock both threads in material.
Perfect stitching appears flat with no puckering of material.
INCORRECT STITCH (A)
When the upper thread lies on the surface of the material by pulling the lower thread up as shown.
This is caused by tight tension on the upper thread or loose tension on the lower thread. To correct this, turn the upper thread tension dial to a lower number.
If perfect stitching cannot be obtained by adjusting upper thread tension, adjust bobbin tension.
INCORRECT STITCH (B)
When the lower thread lies on the under surface of the material by pulling upper thread down as shown.
This is caused by loose tension on the upper thread or tight tension on the lower thread. To correct this, turn the upper thread tension dial to a higher number.
If perfect stitching cannot be obtained by adjusting upper thread tension, adjust bobbin tension.
NOTE:It is recommended that a test sample is made before starting to sew.
