Thread bunching
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A tangled mass of thread, usually on the fabric underside, caused by incorrect threading, an unbalanced tension, or an improperly seated bobbin.
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See also
Bobbin tension adjustment
Fine-tuning the small screw on the bobbin case that controls how much resistance the lower thread meets, used to correct or balance stitch formation.
Lint brush
A small brush used to clear fabric lint and thread debris from the bobbin case, feed dogs, and tension mechanism during routine cleaning.
Machine oiling
Routine application of sewing-machine oil to designated moving metal parts to reduce friction, prevent wear, and keep the machine running smoothly and quietly.
Machine timing
The precise synchronization between the needle's position and the hook's rotation required for the hook to catch the thread loop and form a stitch.
Needle breakage
The snapping of a sewing machine needle, typically from hitting a pin, a bent needle, the wrong needle size, or fabric being pulled against the feed.
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