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Posted on May 25, 2009

Bernina Aurora 440 knotting below my fabric and into bobbin area.

Every time I start sewing, the thread gets tangled up on the bottom of my project and tugged down into the bobbin area, breaking the thread most of the time. The bobbin makes some clicking sounds when this is happening. I've changed to a new needle, cleaned and oiled the bobbin case, and dusted the area. I've checked the presser foot tension - 47. The top tension is set at 4. It was working fine, then I switched to the Stitch Regulator Free Motion foot and every time I pressed the foot peddle, it was going a million miles an hour and knotting up - I had the speed at the lowest it could go and tried both BSR 1 and 2 setting. Then switched back to foot 20 and regular straigth stitch and brought the foot tension from 1 to 47 again (and yes, I had the feed dogs down for the BSR and up for the straight stitch). Now it won't work for the straight stitch b/c of this knotting problem. Any suggestions?

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berninafan

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  • Posted on Jun 17, 2009
berninafan
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Are you sure you have the bobbin the right way round in the holder....when you look at the bobbin and tug the thread, the bobbin should move clockwise.
Pull out the foot pedal and use bsr2 with the start/stop button.
Bring bobbin thread to top of work before starting to sew. This may help knotting problem

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The problem most likely is not the bobbin. The problem is the top thread. If thread is knotting, tangling under the fabric, it is a top thread problem.

Remove the top thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning.

If there are still thread clumps under the fabric, you will need to increase the top tension. (The extra thread appearing under the fabric is excess top thread hanging up under the fabric.) You may need to keep adjusting the top tension until both top & bobbin threads meet in the middle of the fabric.

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