Will not sew. goes cray

SOURCE: model 4832c

guide the the thread through the tension assembly and test it to make sure the tension is working correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or something in the middle. Raise the presser foot and pull the thread through the tension. It should pull easily!! Lower the presser foot and pull the thread. It should pull noticeably harder.)If it doesn't work like this, then there is probably thread stuck inside the tension assembly. Set the tension to zero and blow hard between the discs to dislodge the thread. If it passes this test, continue up through the take up lever,then down through the thread guides to the needle.
Check to be sure you have the correct bobbin and that it is inserted the correct way.
OR remove the needle plate to remove the bobbin case. Look for any burrs or rough spots. Use a fine emery stick and steel wool to remove and buff them Reassemble and try again.
Sewman7

SOURCE: Husqvarna Viking #1plus bobbin problem

I have changed stabalizers and the type of bobbin thread i am using (invisible poly) and it seemd to have solved the problem. Note: wind invisible thread very slowly and carefully it is like fishing line

SOURCE: Singer cg-590 floating bobbin keeps jumping out of it's holder.

I'm not completely familiar with the model, but even a floating bobbin holder as you described should have some sort of a hold down. There may see a small swinging arm on the bottom right side of the bobbin area that needs to be located over the bobbin case to hold it in place. Let me know if this doesn't work.

SOURCE: Upper thread knots up with bobbin thread when sewing a stich

Thread test
Test your thread quality to start, thread your machine and LIFT the presser foot (this opens the tension disks). Pull your top thread straight back. If you feel no tension no mater how much thread you pull, your thread is good. If that your machine passes that test, then let me know, we can go to step 2. If not, try different spool of thread, same test until you get a smooth pull (tip: always check your thread this way when you thread your machine)
Step 2:
Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
Thread knotting on the bobbin can be a lot of things but here's some guidance:
Tension:
If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on toip and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension)
Jamming bobbin case:
If it is damaged from turning out of place once, it could have rough spots on it that makes the thread hang on it, and keeps making it turn over and over. Use a finger nail board (fine sanding) and smoothall rough spots. Then reset the bobbin case taking care to put the notch in the bobbin case in alignment with the proper spot in the machine (basically 5 o’clock) when looking at the round area where the bobbin case goes.

Tally Girl

• 1134 Answers
• Posted on Jan 13, 2012

SOURCE: Thread tension problem when sewing on heavy fabrics

If you are using buttonhole twist or heavy topstitch and normal thread underneath machine tensions wont like it. Try using regular thread top and bottom but use two same colour on top and thread both through needle but put one either side of tension discs if you can. Top stitching jeans is problematic for manymachines even Berninas