Not quite sure since the symptoms are not clear. "Bumpy stitches from bobbin"--does that mean there were thread nests on the bobbin side of the fabric? That is thread nesting or bird nesting resulting usually from mis-threading, upper thread not completely seated in tension disk, or upper tension too loose. Remove the upper thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning--verify the thread path is correct. Set the upper tension to the midway point between high & low number and retest the machine. (Upper tension may need to be tweaked because fabric, thread, and age of the machine will have an affect.)
Check that the bobbin is wound smoothly--no lumps, bumps, or thread ends/pieces sticking out of the bobbin. Check that the bobbin is installed in the bobbin case correctly (turning the proper direction) and the bobbin tension is threaded completely.
If the upper thread is not picking up the bobbin thread, make sure to install a brand new needle. (I don't try to straighten or "fix" damaged needles. With today's computerized machines, it may cause more damage than a new needle would cost. That may work on the old mechanical machines like the Singer Featherweights, but my machines are too important to risk for the price of a needle.) If it still won't pick up the bobbin thread, then the machine's timing has probably been knocked out of alignment. Search for sewing machine timing or take it for service.
...
In the main, I like the former answer. One thought - I have one machine, well - several, that take thin bobbins. And one or two that take the thicker ones. If you have the thick one installed in a machine that wants the thin one, then Nothing works. Just a random thought. I find repair shops just mess my machines up completely. Do that last....bobbin winders rarely mess up. So, set yr machine to it's widest zig-zag, and hand turn the wheel until the needle hits the needle plate. If the needle is bent, it will Not go through the slot. And, you will know which way it is bent. Gently push it back to center. Once or twice. And - check for burrs on the needle - you can feel them with your fingers. Use an emery board or a callous-block to smooth it.
Needles are getting pricey. I still have some of mother's, and both Great-Grandmother's. Use what you have!
×
134 views
Usually answered in minutes!
×