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Coming out? You mean thread breaking? This is always incorrect threading or incorrect tension, or rotten thread.
The videos explain how to set the bobbin tension first and then as long as your threading is okay, any other adjustment is done on the top tension. Bobbin tension only needs very small adjustments and is just enough to stop the thread from falling under the weight of the bobbin.
Set the top tension to four. Now, if the bottom seems too loose go ahead and loosen the bobbin tension a little at a time. If your upper tension isn't real true at four you may have to slightly raise the tension control to offset this.
When you change thread, are you using the same brand of thread and thread weight? A heavier or lighter weight thread will affect the bobbin tension. Otherwise, perhaps the bobbin case is worn. Look for a replacement bobbin case.
which tension is wrong
if thread is bunching up under material increase the tension of the needle thread if the bottom thread is loose then increase the bobbin thread tension
each thread result for above or below material will indicate which thread to alter the tension on
first clean bobbin case loosen thread tension screw and clean under tension spring, hi pressure air is the best. its important to clean under tension part because material builds up and does not allow the flat spring to put the proper pressure on the bobbin thread. tighted tension (second screw) accordingly. all thread tension depends on thickness of goods being sewn. the heavier the good the more tension u need on top.
theres a set screw to the right of the tension device. maybe its loose. the screw is part of the machine body. don't look for it on the tension device. u have to get your head down in the to see it.
upper tension sets the lower thread tension (upper thread is what you see on the underside of the fabric). Bobbin tension is for the thread you see on the top of the fabric
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