Gayle,
In a sewing maching, for the thread not to bunch up, there are two thread tension tighteners. One each for the bottom and the top threads. The top thread tensioner is a nut that tightens or loosens the thread tension. The thread passes under this nut. While for the bottom thread it is two screws on the casing for the bobbin. These two screws hold a small strip of metal to the casing and the thread passes under this strip.
To be able to get proper tension on both the threads you have to strike a balance on both the top and the bottom threads. If the difference is not much then you can do with varying only one of them, usually the top one for ease of functioning.
Since you say that the thread is bunching uo on the bobbin side, ie, the bottom, means that the top thread is too tight and must be loosened. You cant do it in the first go. It may take you a few attempts to get it correct, so do not loose heart if it is taking time.
All the best.
SOURCE: bobbin thread bunching
Hello every one I have the Manual available for the Kenmore 12102 sewing machine in (Pdf downloadable) for those in need of this booklet. You may email me at [email protected] this email address is also used for outreach ministry.
By the way my name is Borther Paul.
SOURCE: Thread is bunching underneath fabric
Needle in correct? Be sure your bobbin is not in upside down and turning the wrong way. Possibly the hook that the bobbicase fits in/on has been hit by a needle and caused a burr that is catching the thread as it comes around. The burr would have to be polished off or hook replaced. The machine could be slightly out of time also.
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