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Loose, loopy, understitching.

The top stitch is fine, but the understitch is very loopy.

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Generally caused by lack of tension on the upper thread. Thread machine normally and pull the needle thread sideways from the needle with the presser foot up. It should pull smoothly. Lower the presser foot and it should become hard to pull and the needle will bend. If this doesn't happen, the upper thread is not in the tension assembly and you should rethread properly. Also, make sure thread is in the take up lever that moves up and down on the front of the machine while sewing.

Posted on Feb 09, 2010

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1 Answer

My Bernina 1031 is making a slight knocking noise and the thread is balling up on the understitch.


try turning the bobbin the opposite direction
try changing the needle
make sure to clean under the needle plate and in the bobbin area
for lint or loose threads

Jan 21, 2013 | Bernina Sewing Machines

1 Answer

Using a twin needle for the first time - topstitch is fine but understitch is loose - i can pull the thread and stitches come out. thank you.


Is your bobbin thread actually under tension? check that it is fully into the tension spring, it sounds like its not tensioned fully.

Normally with a twin needle you'll get a little zigzag showing on the underside but the stitches should be secure.

Jul 20, 2011 | Singer Confidence 7469 Mechanical Sewing...

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2056 the understitch is loose. Is this a problem wit the tension ?


Sounds like a threading problem. Thread the machine all the way to the needle but not the needle eye. Then pull on the thread and lift the presser foot up and down. You should have tension when it is down and no tension when it is up. If this is the case try sewing, should fix the problem. If this is not the case your machine will need to be adjusted buy your pfaff dealer.
Hope this helps

Mar 22, 2011 | PfaFF Hobby 4260

1 Answer

Top stitches look fine, bottom stitches loose and loopy


check your top thread tension, set to 3 or 4
if that doesn't help let me know

Oct 19, 2010 | Brother XR-31 Mechanical Sewing Machine

1 Answer

I have a Bernette 65 and when I sew, the stitch is loose and sometimes loopy on one side. The stitches are crooked on one side and the other side they are loose and the understitch is visible. What do I...


check the thread tension
check the needle to make sure it's the right one for the thread
to check the needle to if it's work with the thread
here's how to check
cut a 8 inch piece of the thread your going to use for the project, take the needle your going to use out of the machine or package, & insert the 6-8 inch thread into the eye of needle
& lift on side of the thread up to a 45 degree angle & if needle is the right size needle for the thread, it will side down the thread easily,,but if it hangs up you need a needle 1 size larger

Sep 25, 2010 | Bernina BERNETTE 65 Mechanical Sewing...

2 Answers

Tension problem


Set the top tension as recommended by the mfg - this is usually between 3 - 6.

Now re-thread the machine with the presser foot up and see if this doesn't eliminated the loopy stitches.

What appears to be an issue with the bobbin may actually be the top thread was not seated into the tension during threading and the tension cannot control the flow of thread to the needle and you get a loopy stitch.

Keep the bobbin case clean as built-up lint can cause stitching problems.

Feb 20, 2010 | Brother LS-2125 Mechanical Sewing Machine

1 Answer

My top stitching is fine, but the understitch is all tangled. Tried adjusting the tension, but nothing happens; still the same. What can I do?


Sounds like the timing of the top to bottom units is disturbed. Time to visit your service dealer.

Sep 14, 2009 | Sewing Machines

2 Answers

Old bernina 830 stitching problem: tight


Sounds like you need to adjust the tension. Probably a good idea to oil this older machine before you adjust. Also look for and clean out any lint or debris in bobbin case and around foot area.

Aug 29, 2009 | Bernina Sewing Machines

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