Have replaced the bobbin and tried adjusting thread tension but bobbin thread continues to knot up and tangle regardless of tension or material used
Have you replaced the needle with a new one? Your needle may be bent or in wrong, or the wrong size. You may have a bad needle. Check that the upper thread path is running freely and is not tangled or wrapped around anything. Make sure that the bobbin is unwinding in the correct direction as well, most bobbins, this is clockwise as the bobbin faces you. If you are using inexpensive thread, it could be the thread that is the culprit. Uneven thread in the needle will not flow through the needle properly, and cause bunching as well. Save it for the bobbin, and use good thread in the top.
The bobbin thread tension
has already been adjusted at the factory for general use. For most
applications, no adjustment is needed.
When sewing with then
thread on thin fabrics, the thread tension may not be adjusted adequately with
the upper tension control dial. Therefore, the thread tension must be
adjusted according to the procedure described below.
If bobbin tension is too
loose and locks appear on the surface of the fabric, decrease the thread tension
by turning the dial to a lower number.
If the result is still
not satisfactory, then adjust the bobbin thread tension.
Increase the tension in the bobbin by turning the screw with a small screwdriver in a clockwise direction. However, do not turn the screw more than one full turn.
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