Have a Singer Touch-Tronic 2001. The thread keeps bunching under the fabric.I tried changing tension and have thread the needle and bobbin several times.

Singer lists 2 machines with the 2010 model number here: https://www.singer.com/support . Do you have the Superb or the Touch Tronic? The manual for the Superb 2010 is currently here: https://www.singer.com/sites/default/files/product_manual/SINGER%202010%20SUPERB%20Sewing%20Machine%20_English.pdf (page 13, 18 of the PDF). The manual for the Touch Tronic is here: https://www.singer.com/sites/default/files/product_manual/SINGER%202010%20TOUCH%20TRONIC%20Sewing%20Machine.pdf (page 28, page 30 of the PDF). For both machines when threading the top thread, the take-up lever must be at the highest position and the presser foot should be up. Work from right to left from the thread spool with the appropriate spool holder in place. Put the thread through the upper guide or guide post. Then bring it around the thread guide and under the pre-tension spring (for the Superb) or under the flange and around the cylinder (for the Touch Tronic). Bring the thread down and into the tension disc. (On the Touch Tronic, keep the thread on the right side of the tension disc.) Bring the thread all the way down the right hand channel and then up the left channel. (On the Superb, you go around the check spring holder.) Bring the thread up to the take-up lever. On the Superb, bring the thread through the slotted eye in the lever. On the Touch Tronic, bring the thread to the back of the lever and then to the left of the take-up lever. Bring the thread into the slit by pulling the thread down and towards you. Run the thread down from the take-up lever and into the thread guide above the needle. On the Superb, there are two thread guides. Get the thread into both the horizontal guide and the one just above the needle. On the Touch Tronic, getting the thread into the thread guide takes holding your left finger at the bottom of the left channel. Then guide the thread into the thread guide from the right. Thread the eye of the needle from front to back. Make sure the slot in the needle is facing forward.

I hope this helps. See the appropriate manual for the bobbin threading. Other threading diagrams may be available on line but choosing the correct one depends on the machine.

Cindy Wells

Typical issues;

1. Bent needle
2. Needle not fully inserted into holder
3. Debris in bobbin case, hook, and/or hook race
4. Top tension too high (extreme)
5. Damaged hook
6. Machine timing

hi Sue.
Why does my bobbin thread keep bunching up? Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimes thread bunching can be caused by something as simple as the tension dial being inadvertently turned.
Sewing Machine Thread Bunching Up Here Why .
if you go to this link a little pop up will come up just close this down.
or try this one.

How to Fix that Tangled Nest of Bobbin Thread Under Your Sewing
or read up more at this link.
Why does my bobbin thread keep bunching up Google Search

Knots? Bird nests under the fabric?

Remove the top thread. ALWAYS RAISE the presser foot. Rethread from the beginning. Verify the thread path is correct.

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

Sewing Machine Thread Bunching Up Here Why

What causes Bird Nests Superior Threads

increase the needle tension

You didn't explain the symptoms. Is the thread bunching, looping, knotting under the fabric? Is the bobbin thread rising to the top of the fabric?

If it is bunching under the fabric, it is probably what is called thread nesting or bird nesting. There are several fixes, sometimes more than one fix is required to resolve the issue.

Be sure to clean under the needle plate, around the bobbin, and the feed dogs. If the machine has instructions for oiling, follow the directions using a fresh, good quality sewing machine oil and apply only 1-2 drops each spot.

Install a brand new needle. Make sure you are using a needle compatible with the thread and fabric being used. All About Needles
Best practice is to use the same thread in both the upper and bobbin. Also, avoid old or bargain bin thread. Spend an extra couple of dollars to reduce frustration and increase success with your machine. If you wish, you may use two different colors of thread to test so you can easily determine what is happening with the tension.

Remove the thread from the machine. RAISE the presser foot and rethread from the beginning--the thread needs to be seated firmly in the tension disk. Verify that the correct thread path is followed (consult the owner's manual).

Set the upper tension to the midway point between high & low numbers (this is the factory standard and is a good place to start, but every machine is different and may need adjustment).

Confirm that the bobbin is installed in the bobbin case (turning the correct direction) and that the bobbin case is threaded properly.

Before beginning to stitch, hand rotate the handwheel one rotation and pull the bobbin thread to the top of the fabric. Then, gently hold the thread tails in the left hand and slowly begin to stitch.

Test.

If thread is bunching, looping under the fabric, the upper tension is too loose. Tighten it and retest. On most machines, the lower the tension number, the looser the tension.

If the bobbin thread is rising to the top of the fabric, the upper tension is too tight. Loosen the upper tension and retest.

Keep adjusting and testing until it is where you want it. Generally, tension is correct when both threads (upper & bobbin) meet in the middle of the fabric. FWIW, tension is static and should be tested and readjusted every time a new project is begun. The needle, thread, and fabric will affect the tension, so it is important to get comfortable adjusting the tension.

Also found the following reviews. Appears that some users have had tension issues with their CG550.

Amazon com Customer Reviews Singer CG 550 10 Stitch Commercial Grade...

..

check the timing

try changing the needle--use a needle according to the fabric
being sewed
if thin fabric is being sewed try using a stablizer
rethread the machine top and bobbin--use every thread guide
make sure the bobbin is inserted correctly and turned correctly
in the bobbin case
also try adjusting the top thread tension just a little

Usually problems like this are caused by improper bobbin winding and installation, incorrect tension, the wrong needle for project, or simply not grasping the threads and gently pulling them backwards when you start a seam.

1. Make sure you are threading the machine correctly.
2. Check your tension.
3. Check the bobbin, make sure it's wound properly and that you don't have the bobbin in upside down.
4. Check for bits of fluff and thread in the bobbin race area.
5. Change your needle, they wear out, get bent, dull... etc. You should have several different types on hand at all times.
6. Grasp both the threads gently and pull slightly backwards when you begin a seam. this will assure that your bobbin thread doesn't get all bunched up under the fabric.
7. Always test tension, needles etc., on a scrap piece of fabric before you begin sewing your project.

:o) Smile... sewing is fun... remember?

"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.