Always--install a brand new needle. A bent/dull/damaged needle may not pick up the bobbin thread.
Remove the thread from the machine. Always Raise The Presser Foot and rethread from the beginning. Make sure the thread seats completely in the tension disk and the thread path is correct.
Test your machine. If it still fails to pick up the bobbin thread, then your machine may have a timing issue (the needle is arriving at the bobbin at the wrong time in order to intercept with the bobbin thread).
There are many web sites and videos explaining sewing machine timing. Or, you can take it for service.
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SOURCE: Needle doesnt hook bobbin thread while sewing
Our machine had the same problem, there was a piece of broken thread stuck in the upper tension spring keeping the tension spring open. removing the broken thread in the upper tension solved the problem for us
SOURCE: picking up bobbin thread
First easy thing to check, are you using the correct length needle.
If this is not the problem then somehow the needle bar has moved and the the needle depth is to high or the timing is wrong..
Unless you really know what you are doing then I am afraid a sewing machine tech needs to reset the needle depth and subsequently the timing.
SOURCE: needle won't grab bobbin thread
Check the position of the needle. Some machines have to have the needle in a certain way or they won't pick up the thread from the bobbin. Make sure the screw on the bobbin is tight but not to tight you may have to adjust it a few times to get it where it needs to be. Also make sure the bobbin is wound tight
SOURCE: Needle hits the bobbin holder and doesn't grab the bobbin thread
Also note that using a red band Singer needle will cause this exact symptom. The Singer needle is about 1.5 mm too long for use in any other machine. Ensure that you're using a standard needle. (Schmetz and Klasse are good examples.)
Your machine may also be out of time, which would require professional repair.
-R
SOURCE: The thread from the needle that goes down to pick up bobbin doesn
make sure your needle's flat bit shows to the back and it is in deep anough. else your timing is out.
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