Bobbin thread bunching

Adjust your thread tension. Low tension can cause bird nesting

bunching of thread under the material is an indication of insufficient tension of the needle thread
increase the needle tension until the threads meet at the center of the materialbeing sewn

the problem is the needle thread tension is not tight enough
tighten it up until there is a definite resistance when pulling the thread by hand

To give you useful information it would help to describe your machine and your problem in detail.

1. thread machine correctly.
2. make sure bobbin case in spinning in the case in the correct rotation. If the bobbin is spinning off of the bobbin incorrectly, "bird nesting" is the result.

Try these suggestions

1. Change the needle--use a needle that's for the fabric being sewed

2. Rethread the machine--top --make sure to use every thread guide

3. try a different bobbin--make sure bobbin is inserted correctly into the bobbin case, & make sure the bobbin is turned the correct way in the bobbin case

4. make sure the thread has not come off the thread take up lever

5. Clean under the needle plate & in the bobbin area for lint or threads

6. Also could be a timing problem, and the machine would need to be checked.

Change needle-flat side to the back of the machine
Clean under needle plate where feed dogs are for lint
Clean bobbin area for lint or loose threads
Rethread machine top thread make sure to get every thread guide
& make sure bobbin is wound correctly & that it is inserted correctly in the bobbin case or shuttle
Check tension 3 or 4 is usually good

with some machines the thread comes off the thread take up lever

this is a top thread tension problem . make shure thread is between tension plates and spring is contacting the plate if the tension number is high

Hello,
Try these solutions.

* Re-thread your machine as it may be threaded incorrectly.

* Raise your feed dogs if your machine has this feature.

* When you start to sew a seam, hold the upper and bobbin thread tails back and out of the way as you sew your first couple of stitches. This will keep them from getting caught in your machine.

I hope this helps.

the needle thread tension is wrong
bunching up under the material indicates that it is too loose