Upper tension when sewing fleece

it is called bird nesting and the upper thread tension is not tight enough
Proper needle thread tension is when you feel resistance as you pull the thread through the needle eye

You may need to tighten the bobbin tension. Sometimes, if you slightly tighten the upper tension, it will bring the bobbin thread up further into the fabric.

understanding thread tension Google Search

Tension setting is trial and error. To learn choose two color threads same weight and manufacture. placing one in bobbin other top tread.

Set the lower tension to light. The lower tension has always been lower than the top.

Depending on needle size and material the upper needs to be set.

Use the images as a guide.




Hope this helps?

It depends on the machine. Some machines keep the lower tension constant and will only adjust the upper thread tension higher or lower. Look for a knob with numbers on it that the thread goes around behind it.

If you can adjust your foot pressure, loosen it slightly. Turn your upper tension to a lower number.

You have to adjust the tension until both upper and lower threads connect . I found with fleece a longer stitch length works better also.

Practice on a scrap piece.

You sound like a very experienced seamstress. Are you inquiring about a serger or a sewing machine. Work with one tension at a time. Is it the upper thread that is loose when sewing on a sewing machine. The bobbin controls the upper thread and visa versa. Set the tension dial on the sewing machine to zero and work from there slowly. Perhaps the tension discs are not controlling the thread any longer. I hope this helps. Kate

How to Thread Juki MO-134 Serger from watching lady at Lyles. Turn upper blade up. Push in first then turn up.It makes threading easier. Blue Thread upper looper first. Pull thread through tension knob. Don'tjust lay it there. (She thought that is what I must have done) Orange Thread lower looper next. Pull thread through tension knob as inthreading upper looper. Adjust lower looper so it is right nextto upper looper so that their points are almost together and directly belowsewing needles. Lower looper will be in front of upper looper (I believe). With tread from upper looper pulledback, slightly lift lower looper above upper looper and thread. I think this isright. Pull thread back with other thread. Tension is the key. Remember that. Yellow: Thread left needle first.Remember tension. Pull thread through curled wire on left side of needle arm. Green: Thread right needle. Rememberabout tension. Pull thread through curled wire on right side of needle arm. b> Note: Before sewing turn the wheel tomake sure the stitches are going together correctly.

Are you saying that the thread is breaking?

CAUSES of upper thread breaking

needle is in backwards
improperly threaded
tension to tight
needle bent or blunt
thread to coarse for size of needle
needle too long for machine
burr on needle
tension discs worn so that thread works in grove
neele too fine for size of thread and fabric
lint or dirt around bobbin case holder
irregular sewing speed
AND THE BIGGEST PROBLEM IS:
threads not properly pulled back under pressure foot when starting to sew
This means, Have enough of the upper and lower thread pulled to the back and hold for the first 2-3 stiches,

Do this every time and it will become second nature and you will do it automatically

upper tension sets the lower thread tension (upper thread is what you see on the underside of the fabric). Bobbin tension is for the thread you see on the top of the fabric