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Looping stitches can be caused by a few different factors. Make sure that your machine is threaded correctly. If the top thread or bobbin thread is improperly threaded it can cause looping stitches. ... Loose thread tension will create loose loops of thread that can cause the needle to catch and create more of a mess. https://www.madeirausa.com/services/troubleshooting/fabric-puckering/
Looping on wrong (bottom) side of fabric is almost always insufficient tension of top thread.
The fabric appears to be multiple layers high density so it will take a higher than typical tension setting.
You can easily verify it is top thread looping on bottom by using a different color top thread. Using a different color top thread will also aid in setting the proper tension as you'll be able to see bottom thread eventually come to top side as you increase tension. Then reduce tension until stitch returns to center of fabric layer.
Looping and nesting on bottom side is usually a top thread tension too loose (or no tension). Always thread machine with needle up and presser foot up. See singer video https://www.youtube.com/watch?v=O7N4XaIV6ms
Less likely is bottom thread has escaped the bobbin case tension spring, but this usually results in a jammed hook.
If still having issues comment here so I may assist further.
not sure if this will help you...Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimesthread buching can be caused by something as simple as the tension dial being inadvertently turned.
Adjusting the bobbin tension should be the last thing to try. Usually, if the machine is working properly, the upper tension should be the main form of tension adjustment. If the upper thread is looping under the fabric, the upper thread is too loose.
If the upper thread is looping on the bottom of the fabric as you sew, the upper tension is too loose. It could be threaded incorrectly, the upper thread may not be seated in the tension disk properly (be sure to RAISE the presser foot BEFORE threading the upper thread), or the upper thread tension is set too loose.
If you have checked everything and it is still looping underneath, the bobbin tension may be too loose or the bobbincase needs replacement.
not quite sure how needle is jamming. I have had them break, had thread ball up underneath and caused needle to jam. Question is the needle in the right way, ie the flat side in as per manual, generally the flat side faces away from you. Sounds like your tension is not quite right if the thread is looping. Loops on bottom, bobbin tension, on top sewing machine tension
Thread looping can also be caused by the use of adhesive stabilizers. During embroidery, your needle can gum up. Try floating a sheet of wax paper on the bottom to see if that might be the cause (along with the above solutions, of course).
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