Bobbin stitch bunches uo using ca 02776 tread while sewing vinyl

SOURCE: Singer CE-100 Embroidery thread bunches up underneath fabric

I had this problem and it all came down to using the wrong backing. I kep trying to use tearaway on everything but WRONG. Using the proper backing corrects most problems. Good Luck!

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: I have a Singer Sewing Machine 5817C, the thread

Make sure that there is tension on the thread when you have passed it through the tension unit, by making sure the presser foot is down, and then gently pulling the thread to feel tension. If there is no tension, as seems to be the case, check the tension discs inside the unit to make sure that there is no debris stopping them from closing.

SOURCE: Singer 4623 bobbin thread won't catch

Hi! Did you by chance, change your needle? If so, make sure you have the flat side of the needle shaft facing the correct direction. If the needle isn't in all the way or the flat side of the shaft facing the right way, the bobbin thread won't pick up.

Let me know if this helps, ok?

Happy Sewing!

SOURCE: needle will not sew thread into material

Sounds like the timing is off. Take the bobbin out of the bobbin case and lower the needle into the needle plate. As the needle starts on the upswing, the hook should meet the needle just above the needle eye on most machines. If it isn't meeting at that point then your hook timing will need to be adjusted.