Working wth cotton t-shirt maerial, but my thread keeps breaking and my stitches are skipping what should I do.

Okay, you've tried a lot of things. The question is this: is the thread snapping (where abouts in the path), or is it shredding at the needle? Here are a few more:

Remove the top thread, ALWAYS RAISE the presser foot, and rethread from the beginning.
Try different thread--perhaps a polyester thread like Isacord or Aurafil. (AVOID old or bargain bin thread.)
Try a different kind of needle (brand new needle!)--like a top-stitch, microtex, or embroidery. The top stitch needle has a larger scarf that will better protect the thread if shredding is the issue. (I use a special bobbin case that I've increased the tension for Isacord thread and I use the same thread in top and bobbin.) I also decrease the top tension a tad so the bobbin thread will not pull to the top. You may need to install brand-new needles several times on one quilt when they get dull.
Usually an 80 or 90 needle will work for FMQ through a fabric/batting sandwich.
Check that the needle's eye is the appropriate size for the thread (also a cause of shredding thread).
Set the upper tension at the midway point perhaps a bit looser for FMQ (this tension will probably need to be tweaked for your particular machine due to wear and age).
Use an FMQ foot and drop the feed dogs. A Supreme Slider (avlb on the internet) is very helpful in helping move the quilt while doing FMQ.
Work at a moderate but steady pace. I find a faster speed while FMQ gets me into trouble...like spots I can't get out of, overlapping stitches, or outside the quilt edge.

FWIW, I still get some skipped stitches with FMQ. Usually, it happens when I move the fabric too fast, especially around a curve. I have a tendency of speeding up while going around a curve that will cause skipped stitches or eyelashing.

I'm also wondering if there is something to do with the fabric and/or batting you are using...like is it Batik? Batik is very tightly woven and presents some particular challenges. The type of batting could be more dense, making it harder for the needle to penetrate the sandwich. Also, pulling or stretching the fabric can cause skipped stitches.

Basic Maintenance Tension Skipped Stitches

Here What to Do if Your Sewing Machine is Skipping Stitches

10 reasons for skipped stitches

If you see no improvement in your machine's stitching, you may want to have it serviced.

Good luck!

Remove the thread from the machine.
Install a brand new needle.
RAISE the presser foot and rethread the top thread.
Verify the thread path is correct.
Load and thread the bobbin case & install it. Verify it is correct.
Set the top tension at the midway point.
Re-test your stitch.

Sewing Machine Problem 1 Thread Breakage

10 reasons for skipped stitches

Skipping stitches and thread breaks
Skipping stitches and thread breaks

Sewing Machine Thread Bunching Up? Here's Why!
Sewing Machine Thread Bunching Up Here Why

Skipped stitches
1. A bent or dull needle
2. The wrong needle for your fabric
knit fabrics require a jersey or ballpoint tip. Most wovens do well with a universal tip, and specialty fibers, like leather or metallic, usually require specific needles.
3. Incorrect machine threading
4. Unbalanced needle thread tension
Start by making relatively small changes and run a test stitch to evaluate the impact. If you need to adjust the tension dial using woven cotton fabric with good quality all-purpose thread and a new needle
5.check the needle is inserted correctly. The needle needs to be pushed as far up the needle shaft as possible. It's easy to insert the needle half way, clamp it down and think it is inserted correctly.
the flat part of the needle should be positioned towards the back. If the needle is not inserted correctly, it will not be able to pull up the bobbin thread and will cause skipped stitches.
6. If the suggestions don't help then it is time for a tune-up.

lower your needle. If up to high can't catch the bobbin thread.

take up lever--try putting some tape on it to see if that will stop the thread from coming off.
also change the needle--make sure is the correct one for the fabric

Good day!

please try this simple tips:

Good day!

A sewing machine operator can often help themselves when their machine does not operate properly.
Here are some simple instructions, which if properly used can save time and mechanics service calls.
TROUBLE;UPPER THREAD KEEPS BREAKING;
This could be trouble;================Do this;
1.Top tension to tight================loosen tension 1 turn
2.Machine improperly threaded=========check threading
3.Thread twisted on guide post========"
4.Thread twisted out of tension======="
5.Take up spring bent or broken=======Check action of spring
6.Thread jumped off pull off finger===Check threading
7.Needle bent or burred===============new needle
8.Bad cone of thread==================try another cone
TROUBLE;LOWER THREAD KEEPS BREAKING;
1.Bobbin tensionspring to tight=======Loosen tension slightly
2.Bobbin threaded wrong===============check threading
3.Bobbin wound to tight or uneven=====try new bobbin
4.lint or thread on bobbin case=======clean inside case
5.Lint or thread inside hook==========clean inside hook
6.Bobbin case nicked bent or burred===check/change case
TROUBLE;MACHINE STARTED SKIPPING STITCHES;
1.Needle bent or burred===============change
2.Needle set in crooked===============Check
3.Thread jumped off take up spring====check threading
4.Thread jumped off pull off finger===check threading
TROUBLE STITCHES SHOWING LOOPS;
1.Forming loops on top of cloth=======Tighten bobbin tension
======================================or loosen top tension.
2.forming loops on bottom of cloth====Tighten top tension
3.Bobbin placed in case incorrectly===remove and replace
4.Bobbin thread slipped from under====check threading of
tension===============================bobbin case
5.Lint or thread in top tension=======clean between tension discs


Thank you and good luck.

Open the needle plate, remove the bobbin and bobbin case.....refer to your manual.

Clean away lint and threads.

Thread with the presser foot up.

If this continues, take the machine and samples of the mis-stitching in for service. It could be the timing needs to be adjusted by a professional.

Might be that you need to lower the tensions quite a bit, you'll have to juggle with top and bottom tensions though, and experiment for just this operation with the Sensormatic.

Make sure you have a new sharp needle installed for both problems and sometimes you need a particular kind of needle for the fabric. Also some machines don't deal well with 100% cotton thread. For some reason it gets caught up in the machine somewhere and breaks. Gutterman and Metrosene make excellent although slightly more expensive threads. Coats and Clark thread is good too. They make an all cotton thread but it doesn't come in as many colors. If you have the old spools of cotton thread from Walmart, just use them for topstitching if you need the color. Other wise, use them for hand stitching or throw them away. One more thing that I can think of off hand, one of my machines does not like lining fabric. For some reason the thread breaks if I stitch really fast. If you have to use that thread, you may try sewing slowly. One more thing, when was the last time your machine was serviced? This can make a huge difference if it's been awhile and you use the machine a lot. Good luck. Hope any of this helps.