What thread are you using and what are you sewing? I'm assuming the machine is stitching correctly and it is just a tension issue. I would test each thread seperatly by hand and see if one thread is too tight or too loose. Thread on the bottom usually mean the top thread is too loose however it could by the bobbin is too tight. It could also indicate a slight timing issue or a burr on the hook. Is the thread shredding or getting damaged?
SOURCE: Singer CG 550 Top thread keeps wraping around the bobbin and jam
Have you checked the top thread is correctly placed in the spring of the bobbin case?
SOURCE: thread or bobbin tension
Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.
Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.
Good luck,
-R
SOURCE: Top thread stitches correctly but bottom thread loops.
FYI---- Loops on the bottom-- problem is in the threading..
Loops on the top--- problem is with the bobbin.
SOURCE: i need find manual for my juki ddl 8500
Go to the website freemanuals.com They may have yours
SOURCE: I just bought a used juki DDL 8500 industrial
I just bought the same machine and mine came with a photocopied manual. There is indeed a bobbin winder on the side, there's a flat section on the side of the bobbin winder closest to you, if you push that forward it connects a wheel attached to a bobbin spoke, to the belt that runs between the machine and the motor. To wind the bobbin, put the bobbin on sideways onto the axis of the wheel that is on the inside of the machine, and push the bobbin winder forward.
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I use same bobbin case as always, never been a problem in 15 yrs. Thread is good, & threading hasn't been changed. There aren't any numbers on tension dial, how do I know if it is at 4.5?
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