Upper thread will not pick up the thread from the bobbin
I had the bobbin case replaced last week .I was sewing the hem on a dress it was all going go ,than there was a loud bang the knob th fill the bobbin popped out and the leaver locked in place .I reset all that and than the machine would not pick up its thread .
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Re: upper thread will not pick up the thread from the...
1.check the needle & see if it's damaged
2.check the bobbin & bobbin case to make sure there inserted properly
3.rethread & try again
4.if the same thing happens,, it should be took to a service technican
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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.
Are you saying that the upper thread is not pulling the bobbin thread up to the top?
Install a brand new needle.
Remove the thread. RAISE the presser foot and rethread from the beginning--allows the thread to seat completely in the upper tension disk.
Check that the bobbin thread is inserted in the bobbin case facing the correct direction and that the bobbin case is threaded correctly through the bobbin case tension. Be sure to leave at least a 6" tail of thread on both the upper and lower threads.
If it is still not picking up the bobbin thread, the bobbin case may be defective/malfunctioning or your machine probably needs professional service.
RAISE the presser foot and then rethread from the beginning. Raising the presser foot releases the tension disk so the thread will seat properly). Also, verify that the threading steps are correct (consult the threading instructions).
Check that the bobbin thread has been loaded in the bobbin case properly and threaded through the tension spring.
Test. If the upper thread is still showing under the fabric, tighten the upper tension disk until the upper and bobbin threads meet in the middle of the fabric.
have you lubricated your machine and bobbin case area? have you checked thread tension on both upper and bobbin thread? Too tight at the top can cause the thread to break. Poorly lubricated or improperly seated bobbin case can also break threads. Also if your needle can be moved left or right, and it's set off-center that can break threads. Good luck.
try changing needles clean under the needle plate & in the bobbin area for loose thread or lint make sure the bobbin is inserted into the bobbin case correctly--if the machine won't pick the thread up from the bobbin correctly take the bobbin out of the case & turn it around & try it that way.
try a new needle
make sure the bobbin is not warped
make sure the bobbin case area is free of lint or loose thread
make sure you hold the upper thread tail while it's going down to pick up the bobbin thread
make sure there is a 2 to 4 in tail for the upper thread to grab
I cleaned the machine good with canned air, oiled it. I took out the bobbin case and cleaned it good also. I then noticed the tension screw on the bobbin case was loose, tightened it and the problem was fixed.