Re: cannot not pull up the bobin thread this is so simple
Make sure it is threaded correctly and make sure the needle is not in wrong. The flat of the needle should be to the rear of the machine and there is a groove that runs the length of the needle which will be towards the front of the machine.
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With out looking at the machine it is hard to determine the exact problem, but make sure your bobbin thread is placed in the bobbine case corretly, and pulled through the little tension area on the bobbin case.
Next make sure the upper thread is in the tension discs, if not this can also cause you a problem, plus if possible used a little canned air (with the pressure foot up, machine unplugged and thread removed) blow out the tension area.
Go to www.singerco.com and under customer support, instruction manual, then enter 3116 and download a FREE manual to your computer. Save it and then you never have to wonder where it is. Another great thing is that you can enlarge the diagrams to really see things close up. You are going to find that your threading is not right with your machine for it to do what you describe. Totally rethread, then with the presser foot up, pull on the top and bottom threads, it should move smoothly, now put the foot down, pull the threads, it should barely move. This should seat the thread in the tension discs. Good luck
Check the ovious things first make sure you needle isnt broken... then make sure there isnt any thread twisted inside your bobin housing. make sure bobin is inserted correctly if those things dont help it could be an issue of timing in your machine... I work as an embroidery operator in a factory setting and those things usually help..
you need to insert the bobbin so that when the thread pulls off it spins counter clockwise. on the side closest to you there is a notch that you slip the thread into and then pull along the side towards the back of the machine staying on the left. once you've done that you can manually turn the knob on the side to make the needle cycle down so that the upper thread will pull up the bobbin thread.
You also need to adjust the pressure foot on the top of the machine. This regulates how much pressure is put on the fabric and the feed. Sounds like it is wrong somehow-maybe you need more pressure. Check the pressure adjustment is screwed in properly if it is this type which unscrews.The pressure adjuster Im reffering to is generally a silver colour and looks a bit like a basic tyre pressure guage or pressure cooker valve-it just got a cuple of lines on it and sits on the top left of the machine above the needle bar. The other thing which could cause problems is the bobbin tension-make sure it is running thru smoothly but not too loose.