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Try a brand new needle. If that doesn't help, then it's quite possible the machine has been knocked out of time. Search for "sewing machine timing" or take it for service.
I've found that when FMQing, I usually need to increase the bobbin tension to keep the bobbin thread down (for this reason, I have a separate bobbin case that has the tension adjusted that is used only for FMQ). You may even need to decrease the top tension if the top thread is "pulling" the bobbin thread up.
The bobbin thread is being pulled too hard by the top thread. The idea is to get an even pull similar to a tug of war. When it is even the thread will form a knot in the middle of the fabric.
To fix this so the top thread isn't pulling too hard lower the tension of the top thread. This should fix it.
There is a small plastic plate where the needle goes down through the foot, remove this cover and you will see the bobbin. Remove the bobbin and refill or selecting another bobbin turn it so that when you pull the thread the bobbin turns anti-clock-wise, slip the bobbin into the black plastic casing, pulling the thread towards the small red arrow at the bottom of the casing, slip the thread between break in the silver metal sleeve pulling it to your left between the 2 pieces of metal this is where the tension on the thread is. You have now changed your bobbin. With the plastic plate still off, hold the top thread with your left hand and with your right slowly turn the wheel, this will send the needle (holding your top thread) down into the bobbin casing and will pick up the bottom thread, pull on the top thread and bring the bottom thread up through the hole in the plate. Replace the plastic plate and recommence sewing. Good luck
Sue
Remove all the thread from the machine.
Verify the bobbin is loaded and turning the correct direction in the bobbin case. ALWAYS RAISE the presser foot and rethread the top thread. Verify the thread path is correct.
Set the top tension to the midpoint and then tweak as needed so the two threads meet in the middle of the fabric when stitching.
Normally you will see the about 1/3 bobbin thread and about 2/3 of the top thread on the bottom side of the fabric. If you dont see any of the bobbin thread on the back side turn the upper tension (needle tension) to a larger number.
Good Luck,
Doug
You should always use proper Bobbin Thread for embroidery - not a bobbin wound from regular dressmaking thread. You are right, the special bobbin thread is thinner so that the embroidery thread will be pulled to the underside and you get a nice shiny embroidery on top with no bobbin showing through. Wind yourself 6 or more bobbins at a time of bobbin thread to always have some on hand, or buy the pre-wound L size ones. All embroidery machines - no matter what brand - recommend using bobbin thread for embroidery. It is readily available at all sewing stores, probably even Spotlight would carry some. If you get stuck for a supply, try overlocker thread.
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