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90 per cent of the tension adjustments are performed on the top tension We discuss the remaining 10 the bobbin tension in this educational article Adjusting Bobbin Tension isn as...
Tension can be challenge for many quilters In this article we share lots of tips and insights about how to address tension issues on your longarm quilting machine
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Loop and nesting on bottom side is usually a top thread tension or top thread feed issue. Be sure needle isn't barbed at tip. If your machine has a horizontal spool pin, be sure the spool cap is larger than the spool and the thread unwinds from spool per machine instructions.
Test tension of top thread.
With needle up, presser foot up, and tension select = 4, thread machine. Then make a long slow steady pull of top thread. The thread should advance smoothly through needle eye without snagging from top spool. Now lower foot and make another long slow steady pull of thread. Again it should advance smoothly through the needle eye. Note difference no tension (foot up) and selected tension (foot down).
If no difference in foot up/down tension then something wrong with the tension selector or not threaded properly, consult machine manual.
You can do a similar test of bobbin thread tension. Make a slow steady pull of bobbin thread. It should advance smoothly from bobbin with tension similar to top thread with tension =4. If bobbin tension is similar to top thread foot up, then likely bobbin thread has escaped bobbin tension spring... reload bobbin per machine instructions.
Tension of lower thread In most special sewing cases it is sufficient to adjust only the upper thread tension. Rarely do you need to adjust the lower thread tension. If it is necessary to adjust the tension of the lower thread, take out the small screwdriver from the accessory box. Fit it in the larger screw on the thread tension spring and turn it not more than 1/10th of a turn to the left if the thread tension is too tight, to the right if it is too loose.
Your upper and lower thread tensions are out of balance. The upper thread tension is too high or your lower thread tension is too low. Make sure your bobbin thread is correctly routed under the tension spring. There is a small screw on the bobbin case that always you to adjust tension.
Make sure the lower looper thread is seated properly in the tension disk. (RAISE the presser foot. Grasp the thread between the thread tree and the tension disk and with the other hand, grasp the thread below the tension disk and give a little tug.) When threading, always RAISE the presser foot so the tension disks are released.
If the lower looper thread is still too loose, set it to a tighter setting until it creates the stitch you want.
Usually, loose threads under the fabric indicate a loose upper tension. Be sure that you RAISE the presser foot BEFORE threading the upper thread. This allows the thread to seat properly in the tension guides. If the loose threads are still appearing under the fabric, try tightening the upper tension. The upper and lower threads should meet in the middle of the fabric.
You sound like a very experienced seamstress. Are you inquiring about a serger or a sewing machine. Work with one tension at a time. Is it the upper thread that is loose when sewing on a sewing machine. The bobbin controls the upper thread and visa versa. Set the tension dial on the sewing machine to zero and work from there slowly. Perhaps the tension discs are not controlling the thread any longer. I hope this helps. Kate
Upper tension is too loose or lower tension is too tight.This might be a good thing. It depends upon how much it is pulling the thread under. A perfect tension on embroidery is about 2/3's lower thread and 1/3 upper thread showing on the bottom. sewman7
It's very possible the bobbin is in upside down and the thread is coming out of the lower tension. Pull on the thread and the bobbin should turn counter clockwise if it is correct . If it turns clockwise, flip the bobbin over , put the thread through the lower tension and try it again. The topside stitch is loose either because the lower tension is loose(or non-existent) or the top thread is too tight. sewman7
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