I agree about the needle, took me forever to learn that one. I have a Kenmore Sewing Machine that would not pick up the bobbin thread every time I tried it after having it for a while. I would go to my other machine and use it. Then my daughter in law put in a new needle and it worked perfect until I tried to stitch a different type of material. It was then it clicked and I started researching needles for machines. You have to use the correct size needle for the material you are sewing or it will not work right. Also if your needle is dull or bent you will also have problems. Here is a site that may be helpful http://www.taunton.com/threads/pages/t00185.asp You can find more info by searching for "sewing machine needle information" Hope this helps.
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First thing to try is a brand new needle. A bent/damaged needle may not be able to pick up the bobbin thread.
Otherwise, it is possible it has a timing issue, ie the needle is arriving at the bobbin at the wrong time in order to connect with the bobbin thread. Search the internet web sites and videos. There is a lot of information on how to fix sewing machine timing. Or take it for service.
Doesn't pick up bobbin thread
1. The bobbin may be in backwards.
2. The bobbin thread & top thread need to be pulled to the back before starting the stitching
3. You need a ballpoint rather than universal needle to sew on t-shirt knits.
4. the needle is in the machine backwards
5. Make sure the needle is the correct one for the fabric being sewed
6. Needle inserted wrong in the needle holder
7. Warped needle
8. Warped bobbin
9. Also could be a timing problem
check to make sure that the needle was put into the needle holder correctly all the way up into the needle holder--flat side of the needle to the back side of the machine if the machine still doesn't up the bobbin thread then it's possible that when the needle broke that it caused the machine to go out of time which means it has to be retime at a sewing machine shop
first let's deal with the needle becoming unthreaded,
Keeping the needle threaded is easy, always keep thread tails of 3 to 6 inches on the top thread & bobbin at all times, & make sure the thread tail are pulled behind the needle before you start to sew,, this will ensure that the thread will not come out of the needle when you start to sew.
you mention the fabric is thin,, do you have a needle that's right for the fabric your sewing?
thin fabric needs a different needle than blue jeans fabric, check your top tension & see what the setting is on, usually 3 to 5 is good.
when the needle & thread are right for the fabric then the sewing is good.
also clean under the needle plate & bobbin area for loose threads or lint
also it's a possibility that the machine could be out of time & would need to be serviced by a sewing machine repair shop-as they have the tools for the job
The most common reason I see for bobbin thread not being picked up is that the needle is in backwards. Or the needle is a little bent (sometimes it's so little you can't see it, but the machine knows!). So start by trying a new needle (size 80/12 is what's used for test sewing on most machines). If that doesn't work, turn the needle 180 degrees and try again -- there is a definite front and back to a sewing machine needle.
Make certain that your bobbins are the exact ones recommended for your machine. Many look similiar, but if they are off even slightly in depth, they will not work. Also, make certain your bobbin in locked into position in it's case and the thread is coming from the bobbin in the correct direction. When holding my metal bobbin in my hand, the thread pulls counter clockwise before placing it into my front loading bobbin case. Each machine is different so check your manual.
Check the needle to see if it's damaged
check the needle to see if it's in backwards
Make sure the bobbin has a 3-5 inch thread tail
Then make sure the top thread has a 3-5 inch tail
Then hold the top thread tail with your fingers (away from the needle)
& use the hand wheel on the right hand side of the machine to slowly
Lower the needle in the bobbin area & see if the bobbin thread will pick
Up that way
check your needle to see if it's bent---roll on flat surface to see if it roll correctly
on some sewing machines when the thread comes off the thread take up lever it can cause the machine to jam
also if the bobbin thread becomes tangled it can jam
check the bobbin area for lint or loose threads
try having a top thread tail & bobbin thread tail of 3-4 inches
try holding the top thread tail & turn the handwheel on the right side on the machine manually & put the needle down into the bobbin area & see if the bobbin thread will pick up that way