Bobbin is nesting - Singer 2517 Mechanical Sewing Machine

Suggest you use a contrasting thread color on top to be sure it is bobbin thread nesting.

If it is bobbin thread nesting, the most common cause is bobbin tension. Be sure bobbin thread has not escaped the bobbin tension spring. Be sure to follow machine instructions for winding and loading bobbin.

See following video on testing tension.

https://youtu.be/YF7EOCvpHLg

Could be thread nesting (also called bird nesting). Most common is failing to RAISE THE PRESSER FOOT when threading the top thread.

What causes Bird Nests Superior Threads
Birds nest under the fabric big loops of thread top side looks good...

TIP Avoid Thread Bird Nesting with these Four Tips Stitching Sewcial

How and Why to Bring up the Bobbin Thread \\

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Susan--
Easy peasy, once you know the problem and how to fix it. It's called "bird nesting" or "thread nesting" or what I refer to as thread "barfs."

Install a brand new needle.
Remove all the thread from the machine.
**ALWAYS RAISE** the presser foot and rethread the top thread.
Verify the top thread path is correct.
Install and thread the bobbin case, make sure it is correct.
Set the top tension to the midway point.

Now retest your machine. Birds nests gone? You may need to tweak the top tension because the factory standard changes due to age and use.

FWIW, problems appearing under the fabric are an issue of the top thread. Thread problems appearing on top of the fabric is a bobbin issue.

What causes Bird Nests Superior Threads

Birds nest under the fabric big loops of thread top side looks good...

WHY IS THREAD BUNCHING UNDERNEATH MY FABRIC

Hm, am wondering if this is thread nesting or bird nesting. Frequently, it will create a knot or huge glob of thread on the underside of the fabric.

Be sure to start out with a brand new needle.
Remove the upper thread from the machine.
ALWAYS RAISE the presser foot and rethread from the beginning.
Set the upper tension at the midway point between high & low numbers. (This is a beginning point but may need tweaking for your particular machine. Tension is correct when the upper and bobbin threads meet in the middle of the fabric.)
Pull the bobbin thread to the top of your fabric before beginning to stitch.
How and Why to Bring up the Bobbin Thread

Begin stitching slowly.


Sewing Machine Thread Bunching Up Here Why

What causes Bird Nests Superior Threads

Birds nest under the fabric big loops of thread top side looks good...

Check that it is actually the bobbin thread that is nesting. Generally, bobbin thread issues appear on the top of the fabric and upper thread issues appear on the underside of the fabric.

If it is in fact the bobbin thread, the bobbin thread tension may be off or malfunctioning.

If it is the upper thread nesting under the fabric:
1. Remove the thread
2. Install a brand new needle
3. ALWAYS RAISE the presser foot. This releases the thread tension so the thread will seat properly.
4. Rethread from the beginning and check the thread path is correct.
5. Set the upper tension at the midway point.
6. Check that the bobbin thread is loaded properly
7. Retest the machine.

If it continues to create thread nests under the fabric, tighten the upper tension.

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What you are experiencing is thread nesting or bird nesting. Take a look at this tip:

https://www.youtube.com/watch?v=jZws5pT1Ics

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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

normally bird nesting means you
change the needle
rethread the machine top & bobbin
make sure the bobbin is inserted into the bobbin case correctly
and make sure the bobbin is not warped, & make sure the bobbin
in turned the right way in the bobbin case
also make sure the top thread has not come off the thread take up
lever
here is a link to a manual to download
http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_PC_8200_EN_233.PDF

Two things I have found that make my singer ce-200 nest. 1st. When I change threads, sometimes I thread it wrong - always nests when I do that. 2nd. When the bobbin runs out of thread it always nests for me, so I have to check the bobbin often. And I remembered a 3rd thing. 3rd. The area for the bobbin & bobbin casing has to be clean, no pieces of threads, and the bobbin casing itself can move, so make sure it's seated correctly.Whenever I get nesting, I take the metal cover off, under the needle, to get in and clean the bobbin area and under the needle good, before I go back to embroidering.

I have fixed it now the bobbin case didn't seem to stay seated during sewing or tangling i should say!. I decided to change the needle and from then on everything worked fine.