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Tension adjustment for denim with denim thread

Bottom thread is very loose, & bunching up

Posted by Joan brown on

  • kakima Jan 12, 2015

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MissFixIt828

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If it is bunching and looping underneath, it's because either the machine isn't threaded correct on top or your top tension is too loose. For heavier sewing, your top tension should be set at 7 or 8.

Posted on Jan 12, 2015

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1 Answer

Why is my bottom thread all loopy


Ok, thread is loopy because bottom tension is way too loose. Tighten the bottom tension. If this doesn't work then
use a different coloured thread in the bobbin and a different coloured thread in the needle. Then you can see which one is making the loop. Fix the tension on the loopy one.

Oct 15, 2018 | Omega Sewing Machines

1 Answer

How do you adjust the bobbin tension?


Factory standard tension for upper thread is the midway point between the high and low number. However, that tension dial is meant to be used for tweaking tension. Generally, tweaking is required whenever the type of fabric, needle, or thread are changed, ie thicker fabric like denim should have a different upper tension setting than fine chiffon. To be successful with tension settings, one must become comfortable adjusting the upper tension.

NOTE: Accurate tension is achieved when the upper thread and bobbin thread meet in the middle of the fabric.
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Understanding Bobbin Tension


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Jan 20, 2016 | Brother Sewing Machine - XL2600i

1 Answer

Why is my thread birdnesting? i am getting some thread that bunches up under my fabric. I have played with the tension changed needles, and rethreaded both top and bottom


bunching up under the material is loose tension of the needle thread
pull the thread out before you thread the needle and if it doesn't require a small amount of effort to pull then the thread is not between the tension plates or the tension plates are not being allowed to move closer together to add the tension
check that the thread is actually between the plates and not to one side of them
full tension adjustment should make it fairly difficult to the thread by hand

Nov 20, 2015 | Sewing Machines

1 Answer

Why does the bottom thread on my 185k Singer sewing machine keep tangling.


Your bottom thread looks like the top tension is too loose or not being fed through the tension disc.
1. While you thread do it with the pressure foot up. Make small pulls while threading to make sure there are no snags.
2. When you finish threading put the foot down. Check for resistance on the thread. There should be some; not excessive though.
3. Always start at four on tension and adjust as you need to.

Feb 26, 2015 | Singer Sewing Machines

1 Answer

Have a DDL-555 bought used. The thread bunches up on bottom.


thread loops on the bottom is a sign that it isn't threaded correctly or the tension isn't set right.

Industrial machines tend to do some strange threading procedures. Are you sure you have it threaded correctly? Two of the machines I've had required that I do a 360 around one of the tension discs. I would start there.

Also some industrial sewing thread is waxed and that wax can cause you issues in between the tension discs. Raise the presser foot and take a piece of sturdy material like canvas or denim and "floss" between those discs. It will help remove wax build up that could be keeping your tension discs from working properly.

Nov 25, 2012 | Sewing Machines

1 Answer

How do i adjust the loose thread on top? Using the 3 thread stitch the top loop is loose and bulging over edge instead of smooth with rest of stitches. Setting is set to recommended setting but is still...


I always adjust my overlocker stitch in several ways. I start test serging with the blade set right out to the right so that it "fills" the stitching. I'll set all the thread dials to the middle setting, ie. 5. Then I test serge, and check the stitch formation. If the needle is looping underneath, then I'll tighten it "A LITTLE". If the looper threads are lying off the cut edge of the fabric, then I'll dial both the top and bottom looper numbers up a little to make those threads tighter.

Each fabric behaves differently depending on its "hand" so the right stitch settings do vary, ie. organza is different to heavy weight cotton or denim. So if my inital setting is then "bunching" up the fabric within the stitching, I will then lower the numbers for the top and bottom looper to release the thread some. And if the fabric is very soft and light and still bunches up, then I will move the blade over to the left some, cutting a narrower edge within the overlocking so the threads lie better.

So revist the settings, check that the cones are flowing freely, thread is into the tension devices fully, then retest the stitching. If it is the top looper only that is looping off the edge, and not the bottom as well, and they are both set to the same number, then I'd be a bit suss about the tension dial.

Feb 28, 2011 | Singer 14SH654

1 Answer

My bobbin stitch is loose. I have tried adjusting tension and have changed the needle.


A. To correct loose stitches, try the following: (1) Balance the thread tension. If the stitches are loose on top of the fabric, decrease the tension to the next lower number. If they are loose on the underside set the tension to the next higher number. (2) Make sure the needle/upper thread follows the threading path. (3) Check to see that the bobbin case is threaded properly. (4) Use a different size needle. For fine fabrics, use a smaller needle (size 9, 11); medium-weight fabrics require a size 14 or 16. And use a size 18 or "Denim" needle for heavy corduroy or denim.

Sep 20, 2010 | Singer Curvy 8770 Electronic Sewing...

1 Answer

Pfaff varimatic 6091 sew a rag quilt with jean and flannel,I can't get my tension right it seems to be funny on the bottom stitch,where shoulf the top tension be set at 4 1/2 ,when do I adjust the bobbin...


Hi! The bobbin tension rarely needs to be adjusted. First, make sure you're using the appropriate size needle and thread for your fabric (I'd probably use either a 'denim' needle or a universal size 14) and also that the upper thread and bobbin are threaded absolutely correctly. These can throw off the tension! Also, take the time to clean out the bobbin area. That can throw your stitch off also.

If the stitch on the bottom is loose, so that you see the top threads, then the top tension is too loose. If the top stitch is too loose and you see the bobbin threads on top, then the top tension is too tight.

It helps to thread the machine with different color thread on top and in the bobbin, and then stitch an inch or so on the same type of fabric as you're using in your quilt. Check the stitch. If you need to adjust the top tension, make sure the pressure foot is down! Adjust a little, stitch a few inches, and check again. Repeat until you don't see any (or very little) bobbin thread on the top or top thread on the bottom.

If you go through all these steps, and the bobbin thread is still loose (and you've tightened up the top tension), then there is a tiny little screw on the side of the bobbin case that you can use to adjust the bobbin tension. Turn the screw just a little bit (less than a quarter turn), stitch, check, etc. Once the bobbin tension is set, you shouldn't ever have to change it.

Let me know if this helps, ok?

Happy sewing!




Feb 10, 2010 | PfaFF Sewing Machines

1 Answer

Bottom thread bunching up, baby lock denim pro


bottom thread bunching up is actually the needle thread having no tension. Most likely the upper threading is wrong...

Jun 10, 2009 | Baby Lock BL1556

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