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OK, Nylon thread and vinyl fabric are difficult. Try this: 1. Be sure your machine is *very* clean - no leftovers from previous projects. 2. Take the bobbin receiver out (need a screwdriver to hold the release), clean it and all around it and re-insert. When you re-insert in this machine, hold the release lever with the screwdriver, push the receiver away from you (under the feed dogs) then bring it back toward you so it catches before you release the catch. 3. Use a stitch length just a bit longer than you 'normally' would - 3+ for vinyl. 4. Wind your nylon thread onto a bobbin *very* carefully. It's easy to get it caught so that it won't feed evenly. 5. Be sure your upper thread is in properly, and that it doesn't catch on anything. 6. Adjust your upper tension tighter than 'normal' to accomodate the slippery thread your're using - do this a little at a time, it's easy to miss the 'sweet spot' if you adjust too much. 7. Be sure to bring up your bobbin thread and hold both threads as you start to sew - hold them for 3-4 stitches. 8. Sew slow - this machine can go *really* fast, but don't let it on this project. It will catch better if you take it slow and easy.
Hope all this helps. If not, you'd probably better take it in for service.
make sure to use every thread guide try a new needle make sure the bobbin is inserted correctly if these suggestions don't help & if the machine is still under warrenty take it back & let them check it
There are a few easy and free things to check:
1- try a new needle
2- check that the needle is inserted the right way (one side has a long slot, usually this goes toward the back of the machine)
3- flip the bobbin over
4- clean any stray threads/fluff in the bobbin area
Another possibility is that the machine's timing is off- the bobbin thread isn't in place to be picked up at the right time- and that would need to be fixed by a sewing machine mechanic. But if this started suddenly, and not after hitting a pin or otherwise jarring the machine, then it probably can be solved with one of the easy/free solutions above. Good luck!
check to see if you have your needle in backwards
have you checked your needle to see if it's bent-roll it on a flat surface & see if it rolls good
check to see if the needle is blunt-makes a popping sound when going thru fabric
check to see if the thread is getting caught on the notch of the spool of thread
check to make sure the bobbin is not warped
check to make sure there are no burrs on the bobbin case
check your upper thread tension
I've just had this exact problem with my model 2037. The problem, according to 3 shops I've taken mine to, is that the shuttle hook (the metal piece that the bobbin sits in) is broken and needs replaced. Problem is, the piece is next to impossible to find.