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to check the asembly
do a needle /hook timing check
with the needle fully down the hook of the bobbin carrier should be almost at the needle
as the needle starts to come up the hook should be just at the needle eye or slightly above it but not over it
this is all i could find out from the internet.
Make sure the presser foot is up when seating the thread through the upper tension. Now, it's time to draw up your bobbin thread. Turn the hand wheel (TOWARDS YOU ONLY, never turn the hand wheel away from you) and hold the needle thread lightly. Tug on it as the needle goes down and then comes up again.
if this is off no help to you go to this link and see if its any good to you. Frequently Asked Questions Singer Sewing
or this one. Sewing Machines Won catch bobbin thread Google Search
try changing the needle rethread the machine top & bobbin make sure to use every thread guide make sure the bobbin is not over wound make sure the bobbin is turned the right way in the bobbin case make sure the bobbin is not warped or damaged if you've done all these things then it's also possible that the machine is out of time & needs to be checked at a repair shop
Well you may please follow the steps below - 1. Remove the bobbin from the sewing machine. Note: whether you have a drop-in, front or side-loading bobbin on your sewing machine. A drop in bobbin will load from the top, may be via a removable bobbin case cover near the machine-fed dogs. A side or front loading bobbin needs to be loaded into a removable bobbin case under the machine. 2. Choose the right size bobbin for the sewing machine. 3. Wind thread onto your bobbin. Your sewing machine should have a standard thread spool to hold the thread and a short, squat post wide enough for a bobbin. 4. Put the thread and empty bobbin into position on your sewing machine. Wrap the thread around the bobbin to start it. On most machines, disengage the needle by turning the smaller hand-wheel on the machine toward you. Push the bobbin post into position, securing the bobbin into place. Press gently down. Thread should begin to wind neatly onto your bobbin. 5. Break the thread, push the bobbin post back into an inactive position and remove the bobbin. Tighten the hand-wheel. Thread your sewing machine again if necessary before loading the bobbin. 6. Remove the bobbin case cover and put the bobbin into position. The thread should slide through a catch on the bobbin case and up through the cover. 7. Access the bobbin case for a front or side mount bobbin. Lift the catch and remove the removable bobbin holder. Put the bobbin into the holder and run the thread through the holder, bringing it to the front. Lift the catch and slide the bobbin holder back into the case. Hold your needle thread gently forward with your left hand and turn the hand-wheel. The needle thread will pass down into the machine and catch a loop of the bobbin thread. Pull this loop up and slide both threads to the back before beginning to sew. Good Luck!!
check that the needle is in the right way round i.e. with cut out on the needle facing into the machine. if this is fine then check that as the needle comes back up from the lowest point that it goes to, that the point on the bobbin case passes just above the hole in the needle, i.e. in the middle of the cut out.(if not it needs re timing) if threaded a small loop should appear at this point for the bottom bobbin to catch if not slacken the top thread and try again.