SOURCE: The upper thread is not catching correcttly. When
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
SOURCE: I have recently bought Singer Quantum 9940 and I
1. Make sure your needle is correct for the fabric. Go buy some good needles in several sizes. You'll need a 90 for jeans, rounded points for fine fabrics... get a few sizes. Your manual should provided you with clues to the right needle for the fabrics. (BTW... there really is no such thing as a Universal Needle... toss it.)
2. Re-read your manual and carefully follow the instructions on threading the bobbin and the upper thread...
3. Check your tension on the upper thread... it is too loose for the application. The tension on the bottom thread is handled by a spring on your bobbin case or race. If you do not have that threaded properly you'll have problems. Same with the direction the bobbin turns... have in it backwards... problems.
Barring all these things... It might be time for a qualified Singer repair person to look at it. Sadly Singer has seriously lowered it's standards in the last 20 years.
SOURCE: upper thread will not catch the bobbin thread
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
SOURCE: singer 756u stitches not catching
So this is a serger? Might have been nice to know that. Make sure you have threaded your serger in the correct order. upper looper, lower looper, needles from right to left.
Make sure you do this with the presser foot lever in the UP position. Make sure all the threads are pulled fully into any tension guides.
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