I have a brother B757, I am making curtains and the fabric at the bottom ends up being longer than the fabric at the top can you solve this

Looping on wrong (bottom) side of fabric is almost always insufficient tension of top thread.

The fabric appears to be multiple layers high density so it will take a higher than typical tension setting.

You can easily verify it is top thread looping on bottom by using a different color top thread. Using a different color top thread will also aid in setting the proper tension as you'll be able to see bottom thread eventually come to top side as you increase tension. Then reduce tension until stitch returns to center of fabric layer.

Suspect uneven feed of top thread.

Manual for reference if needed.
https://www.brother-usa.com/-/media/brother/product-catalog-media/documents/2018/04/20/08/38/um_pc_8500_en_194.ashx


Please check the following;

• This machine has a horizontal spool. Try using a spool cap that is slightly larger than the spool. Verify spool is in proper orientation, and threaded per instruction. See page 19.
• Embroider foot "Q" is installed per manual instructions. See page 32-33.
• Feed dogs are down (supposed to happen when automatically table is installed but check and make sure).

There should be no looping of thread on bottom side. This would indicate top thread tension is too loose or uneven feed (spool cap and/or orientation). Suggest you preset tension prior to installing table using normal presser foot and single layer of same fabric and same thread. Select a straight short stitch (machine default) and tension 4. With a single layer of fabric, tension at 4 is likely high and you will see bottom thread loop on top side so slowly reduce tension until bottom thread no longer shows on top, Then switch to embroider setup and test run.

Comment below with results and I'll assist further if need be.

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uually your tension should be set between 4and 5 this is a good tension for most fabric

Hi there Kathryn... when you load/thread the top cotton through the machine.... and then through the eye of the needle.... do you also load the bobbin case... or is it already in there and loaded as per instructions... ? What I normally do... is load up the bottom and top threads first.. making sure to put the top thread through the needle and make the thread end go through and behind the 'foot'... when placing on fabric to try... I make sure to load the fabric... with the top thread's tail going out through the presser foot and behind your foot.. sometimes.. if its the thread (some machines don't like certain threads)... I will manually (wind the right hand wheel) so that the machine does a few stitches.. before I use my foot pedal!.. I have both a serger/overlocker... and a Brother 8500 (sewing/embroidery machine).. I have been sewing for over years now...
You will need to change your needle... when you've used it for more than 6-7 hours continuously.. OR you notice that the stitches are not as they should be... in your fabric...

try changing the needle
check the top thread tension to make sure it's not to loose
rethread the machine top & bobbin, make sure the bobbin is wound
correctly & inserted correctly into the machine
make sure the thread has not come off the thread take up lever

type in your browser chain stitch machine & it will bring up website
that have them

Usually it is the opposite problem of what you think, try rethreading your machine , because the bobbin thread has to lock on to the top thread. Try this test, with presser foot up, pull top & bottom threads, they should pull smoothly, now lower presser foot and pull again, they should barely move. Try your tension at 3 and your length longer. If that doesn't seat your thread in the tension discs, I don't know what will. You can always call Brother at 1-877-276-8437 and ask if you got a dud and what you can do about it.

can u showe me a visial on how to thread