Sewing machines use two threads and a carefully timed system of hooks to make a series of knots. These knots form the stitches on your fabric. If any part of this system isn't working properly, stitches might drop.
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The sewing machine is carefully timed so that the thread from the upper section of the machine is pulled through the needle. When the needle is at its lowest point, it connects with the hook on the bobbin case, which pulls the bobbin thread up through the bobbin case. If the timing is off, and the hook and needle don't meet when they are supposed to, stitches drop.
If your needle is dull, it won't pull the thread through the way it needs to. Oftentimes, changing the needle corrects the problem.
The thread on your machine is pulled through the machine at a certain rate, which is controlled by the machine's tension settings. If the tension is too tight or too loose on either thread, the knots needed to make the stitches may not be properly formed. Adjusting the tension often resolves this issue.
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