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Please check whether it is the bobbin thread or the top thread that is messing up. If it's under the fabric, it is 99% the top thread and is called bird nesting or thread nesting.
Remove the top thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning.
Verify the thread path is correct.
Also check that the bobbin is loaded and turning the correct direction in the bobbin case.
Now, retest the machine.
You may need to tweak the tension to get it where it looks best.
I would start by re winding your bobbin and making sure that it is done though all the correct tension loops. A bobbin that is wound to tight or loose can cause all sorts of problems. If that has been done then completely rethread the machine from scratch. Now go through and check all your tensions, it sounds like the bobbin tension is too loose and your stitch tension is too tight. Adjust and try again.
have you tried adjusting the top tension first?
if you have a drop in bobbin then it has to be adjusted at a sewing shop
the bobbin case you take out of the machine you can, using a small screw driver,,here's how
lower bobbin tension--
to test the bobbin tension,
remove the bobbin case & bobbin,,
hold it by suspending it by the thread,,
**** it once or twice,,
if the tension is correct, the thread will unwind by about an inch or two
if the tension is too tight, it does not unwind at all
if the tension is too loose, it will drop too much
to adjust turn small screw on the side of the bobbin
to the left is tighten
to the right is loosen
did you get a operation manual with the sewing machine,, it should tell if your is self oiling or you have to oil it,,
are the stitches loose on top of the fabric you have to adjust the bobbin
but if stitches are loose on bottom of fabric adjust top tension- usually a setting 3 or 4 should be good
Loose bottom stitches mean the UPPER tension has a problem. Pull the thread through the tension assembly and
test it to make sure the tension is working correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it does not work this way( the tension stays loose) you will need to set the tension to Zero, open the discs with a small screwdriver and remove the lint or thread which is stuck in there. Sewman7