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I have a new home model L-372 that I used for almost 10 years. It was stitching perfectly and then all of a sudden the bottom stitching is not picking up. The bottom stitching just adjust in loop size depending on how I adjust the tension. I have tried everything. . . all the normal troubleshooting. This happened like 4 years ago and I tightened the little screw on the bobbin case and it solved the problem. This time no luck. I have cleaned and oiled the machine, changed the thread, tried different needles, and adjusted the tension every which way! No luck. Should I throw this machine in the trash? I am open to ANY advice.
If you feel adventureous you can take the bobbin case apart and make sure that it is clean and thread runs smooth thruugh it. This is delecate to do and takes younger eye's than mine and do this on a clean table covered in a plain cloth so you don't loose parts and don't force anything when putting back together it is stanliss steel but will break and screws can strip. If you have been sewing any thing that has any glue or is dirty you could have a build up that is draging the thread. Sometimes just a good cleaning in warm mildely soapy water will fix this.If tightening your upper tention helps some this is a good indacator that this is the problem.
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Is the top thread making a thread mess under the fabric? That usually means the top tension is too loose or the thread is not seated in the tension disk.
Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning.
Set the top tension at the midpoint and test your machine. Then adjust the tension until the two threads meet in the middle of the fabric.
it's possible there could be a loose or broken part in the machine, and the cam that does the zig zag could be worn or damaged.
having it checked would be a good idea.
Suggest you do rethreading ,then test the stitches on straight stitch. If top stitches is loose you have to reduce the upper thread tension, if the bottom stitches is loose you have to increase the upper thread tension. Adjust accordingly till you can get a perfect straight stitch. If okay then you can continue your embroidery work.
it's very possible that the machine is slightly out of time & needs to be service at a sewing machine shop is the fabric & thread & needle compatable with each other? did you use every thread guide when threading the machine? is the bobbin in correctly? is the bobbin warped?
Try this to see if it helps:
Remove top thread.
ALWAYS RAISE the presser foot and rethread from the beginning.
Start the top tension set at the midway point and then adjust.
Check that the bobbin is threaded and installed correctly.
You are sewing heavy thread in a machine designed for sewing clothing but it can be done. Use a size 18 needle or a top stitching needle(it has a larger eye). Thread the machine and adjust the tension to 8 or 9. Set the stitch length at 3 or 4. If you still get loops on the bottom, wind the thread around the bobbin winder thread guide once for more tension and then thread it normally. If you do this, lower the tension to 5, test sew and then tighten the tension until the loops go away. sewman7
Because it is almost a straight stitch but the needle continues to move in a zig zag fashion is reason to believe it is in a long stitch. By changing the number of stitches per inch there will be a very noticeable looking zig zag stitch.
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