Suddenly there seems to be great loose needle tension -- the thread is knotting under the fabric and very little bobbin thread is being pulled out.... tried adjusting the needle tension practically every number
I have an Elna 2005 machine and had a similar but opposite problem whereby the tension up top was too tight - thread wouldn't pull smoothly. I found adjusting the feed dog lever slightly helped the stitches a lot, even though the needle tension up top is no better. Hope that helps! :-s
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it indicates that you have a situation called " bird nesting" and that is a result of the needle thread tension being too loose
needle tension should be tight so that when you pull the thread to thread the needle you have to exert a bit of effort to pull the thread through the tension plates
you can adjust up or down from that feeling
thread thickness affects the tension and needle eye size also affects the tension as a small eye on large thread makes the thread movement hard indicating less tension or a big eye on a small thread affects the tension as the thread slips easily and needs more tension to pull the bobbin thread up to the centre of the material being sewn
the bobbin tension is set by that small spring plate that you pull the thread under after you put the bobbin back in the carrier / holder
a very small turn of that screw makes a big difference ob the tension unlike the needle thread tension
mostly the problem ( you never bothered to mention the symptom ) is bird nesting under the fabric which is the needle thread tension not tight enough
Top thread problem, Not enough tension on top=loops on the bottom of the fabric; too little tension on the bottom = loops on top of the fabric. Yes, I know it seems backwards. See: http://www.picturetrail.com/sfx/album/view/22521551
Dollars to donut holes, you either threaded the top of the machine with the presser foot down (it has to be UP to let the thread into the top tension), or you're trying to sew with the presser foot still up (which is an issue common to people trying to sew bulky seams).
Take the thread off the top of the machine, take out the bobbin case and give the machine a cleaning, rethread the machine, fetch up the bobbin thread and hold the bobbin and top thread ends together under and behind the presser foot for the first 2-3 stitches of each seam.
I have the same problem but i have not watched it. I does not seem that anyone wants to help us here, I am going to other sites until i find someone knowledgeable. apparently we are the smartest here at the moment ;)
The "knotting up" can reveal a lot. If you have loose threads on one side or the other, the tension on the opposite side will be the culprit. So if the threads are on the underside as you sew, it is the top tension. Top tension ought to be between 4 & 6 (this variation to allow for the different weights of fabric in your projects). If tensions appear correct, and the thread is definately in the channel between the discs, try raising presser foot, remove thread and with a strip piece of fabric 8 - 10" (20 - 25cm) gently insert the fabric strip and clean between the discs with a see saw / to and fro action. It may be there is lint trapped between the discs, this will keep them slightly apart and reduce the actual tension, sometimes dramatically. If the loose threads are on the top, it is bobbin tension that is loose, it too may have lint in the spring and be giving a "false" tension. I would not recommend fiddling with bobbin tension without being shown, it may end up with missing small screws and spring pieces.
Check that it is threaded correctly (both top and bottom) making sure that the upper thread is in the takeup lever. Watch the needle as you slowly turn the handwheel counter clockwise (toward you) and the needle point touches the fabric (make sure presser foot is down). Is the thread still relatively taunt? If it is loose, the upper thread tension unit does not have enough tension. Check the areas where the thread goes and make sure you remove any loose threads or fluff which could be inhibiting the tension discs from closing over the thread. If the tension unit still is not tightening enough, the tension unit may need to be replaced or the circuit board replaced. If everything is ok in the upper thread area, now look at the bobbin area. With no fabric, watch as the needle enters the bobbin area. Does it go down and the upper thread catch the bobbin thread and pulls it to the surface? Check for anything preventing the bobbin thread from being pulled up to the surface through the needle plate. If you have still not been able to resolve the problem suggest you take it to an authorized husqvarna viking dealer for service. You can locate a dealer near you by visiting the husqvarna viking website and clicking on the Dealer link on the left-hand side of the page - http://www.husqvarnaviking.com Good luck.
In 99% of all problems with "bird's nesting" or "knotting" it is an issue of the thread coming out of the take up lever (at threading guide #3) (from the spool; through the first thread guide at #1 down to #2 and up to # 3) when the thread comes out of the take up lever, the machine can not regulate the thread and it floods the machien with thread and wraps itself around the bobbin case. OR! Your tension is too loose. Raise it. Your machine should preform perfect at tension #4 unless you are using speciality threads or fabrics.
ALWAYS be in the habit of threading your machine with presser foot up so that while threading between paths 1 and 2 you are certain to have the thread pass throught the tension disks.
This will happen on a $50.00 machine or a $5,000 machine. The thread needs to be regulated.