Trying to sew tab tops on a thick curtain which is lined have got a larger needle and decreased tension but its not working help Using a Brother x3600 sewing machine

Sewing on double layers of leather can be challenging, and it's important to have the machine properly adjusted to handle the thickness. Here are some adjustments you can try:

1. Needle size: Make sure you are using the correct needle size for the thickness of your leather. A larger needle may be required to penetrate the layers.
2. Tension: Adjust the tension of the upper thread. If the tension is too tight, it can cause the needle to break or skip stitches. If it's too loose, the stitches may be uneven.
3. Presser foot pressure: You mentioned you have already adjusted the presser foot pressure, but to clarify, turning the adjustment screw clockwise will increase the pressure, while turning it counterclockwise will decrease it. You may need to increase the pressure for thicker materials.
4. Stitch length: Increase the stitch length for thicker materials. A shorter stitch length can cause the machine to struggle to sew through the layers.
5. Speed: Slow down the speed of the machine when sewing on thicker materials. This will help the machine to handle the thickness and prevent skipped stitches or broken needles.

If none of these adjustments work, you may need to take the machine to a professional for further inspection and repairs.

Are using embroider table?

Suspect uneven feed of top thread from spool. Check that top thread spool is correct orientation and spool cap is larger than spool.

See page B-25.https://download.brother.com/welcome/doch100190/888g00_g02_g04_g05_g06_om03en.pdf

With presser foot up and needle up, select tension 4 and rethread top thread. Then make a long slow steady pull of top thread. It should advance smoothly through needle eye with even tension (no snagging). Now lower foot and again make long slow steady pull of top thread. It should advance smoothly through needle eye. Note difference in no tension (foot up) and tension select 4 (foot down).

adjust your bobbin tension

try increasing/decreasing the needle thread tension for the added material thickness
use scrap material until you get it right

Most likely, it has to do with incompatibility of the needle, thread, and fabric. The force of the needle penetrating the fabric multiple times is actually causing the thread to (wear &) fray and eventually break. There are needles with larger grooves that tend to protect the thread during stitching. Some may recommend a Top Stitch Needle (Home Machine Needles Superior Threads Why Topstitch? The Topstitch needle is the most common needle type used and recommended by professionals and educators. We recommend the Topstitch for piecing, quilting, embroidery, appliqu?, and construction. These needles are available in four sizes to accommodate all thread types, including metallic threads. The Topstitch needle has a larger eye and deeper groove. It is often referred as the MAGIC NEEDLE. It really does make a difference in your sewing experience.)
Why Use Topstitching Needle

Also, if the thread is a tight fit through the needle eye, it will also tear the thread. Make sure that the thread will slip easily through the eye. Go to a larger needle, instead of 90, try a 100.

Be sure to use a brand-new needle.

All About Needles

The Parts of Sewing Machine Needle

You may also consider changing the type of thread you are using. Go with a stronger thread, ie polyester, rather than cotton. Cotton will shred and break easier.

You will probably need to re-adjust the thread tension. If it is too tight, it will also break the thread. If you are using a heavier weight of thread, you will need to adjust both the upper and bobbin tension to accommodate the heavier thread.
Bobbin Tension How and Why Tension is Adjusted

If you sewing fabric that is sticky, ie vinyl, oilcloth, you should try to use a roller presser foot, a teflon presser foot, or a walking foot to help the fabric move with the feed dogs.

Sewing Heavy Fabric with NON Heavy Duty Sewing Machine SEWING IN GENERAL

Tips

Sewing through many thick layers of fabric Sactin

http://www.kollabora.com/q-a/sewing-denim-and-thick-fabric

14 Fantastic Sewing Tricks and Tips Making the World Cuter

How to Sew Upholstery DoItYourself com

...

you probably wont find it listed anywhere as it is from experience and changes with different material thickness and needle size
SO how to set tension
thread the machine and adjust the tension until you feel a drag on the thread
now thread the needle and sew a piece of scrap material
if the thread bunches up underneath then increase the thread tension until it sews properly
if the bottom thread is pulled to the top or the thread keeps breaking loosen ti off a bit
when the stitch is being properly formed , both bottom and top threads should meet at the center of the two materials being sewn

Don't ship it back and the problem is not the tension settings. Even on the tightest setting the thread should not break. Most likely the machine is not threaded correctly. Possibly, you are using too thick a thread or a needle that is too small.

Solution back to basics:
1. verify that you are not using upholstery thread. Use a standard cotton poly mix.
2. the bobbin thread should be the same as the top thread.
3. consider watching a video showing the machine being threaded and make sure the needle is in the top position.
4. sew a test pattern on a normal weight fabric like an undershirt - avoid very thick material.

If this solves your problem then change one item at a time. Use a heaver thread if that is what you want. If it works ok then go to a thicker material, etc. Do not change two or more things at a time..If you have a problem it makes it hard to identify the source.

when sewing thick fabrics and when using thick threads you will usually need to tighten top tension - on most machines to maximum in order for the machine to pull the thread up into the fabric. you must also use a needle which will slide along the thread when thread is through eye of needle (take needle out of machine, put thread through eye and see if needle will pass freely along thread - if not, use a larger needle)

scott.

You will need to use a size 18 needle or even better a size 18 top stitch needle. It has a larger eye.Tighten the tension to about an 8 and try it. You may have to lengthen the stitch length to make it sew satisfactorily.. If it won't work on 8 go to 9 and if it still won't work, wrap the thread around the bobbin winder guide (on the left top of the machine) for more tension. It is very hard to sew heavy duty thread on a household machine.
sewman7

can u showe me a visial on how to thread