Thread loosens underneath intermittently. Stitches not consistent.
I get loops on the underside of fabric no matter how loose or tight
I set the tension. I cleaned the tension discs, replaced the bobbin,needle,and cleaned around the feed. I just start sewing and it starts to loosen on the
underside of fabric then tightens up etc.
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If the bottom thread is tight there should also be loops on top and this means that the upper tension is too tight.
Get out your manual (http://www.singerco.com/uploads/download/1198_8763-efs.pdf) and turn to page 24. Under "ADJUSTING TOP THREAD TENSION" it tells you that if you're having thread tension issues, change the tension control dial on the top of your machine from auto. It also shows you a diagram with your problem illustrated on the right side of the page. The bobbin tension is set at the factory, so all tension problems can be solved with top tension adjustment. Set it manually and if it loops on top, loosen the tension a little. Test again. Repeat until loops are gone.
Using different colours on top and bobbin and a contrasting fabric (e.g. black top, white bottom, light blue fabric) means you can easily see what's happening. A perfect stitch is when you see exactly the same stitch pattern on both sides of the fabric. On top, the bobbin thread colour appears between stitches as a tiny dot and on the bottom, you see the top thread dot between stitches.
If it's impossible to get the tension right, take it to a technician, because it's a sign that the hook timing needs attention.
YOur top thread is looping, right? Re-thread your top thread, making sure you floss it into the tension system. When you drop the pressed foot it should offer tension to the thread. Right? When you have underside loops it would indicate too much thread, right? So either the tension is too low OR something is jerking on the top thread causing a loop.
Loops stitches on the underside is typically from the TOP tension being too loose, however it can also be the bobbin tension is too tight, or a problem with the needle. I would check them in that order.
Hold the bobbin thread and let the bobbin dangle. A slight shake of your hand should allow the bobbin to move downward (lets more thread out) but not so much that it just drops to the floor. When you put it in again and try sewing look at the top stitches. Do they look overly tight? THen the bobbin tension is too tight. The stitching should look the same top and bottom with no loops.
If both tensions seem to be alright check to see if the needle is: 1. the right size and type of the fabric 2. not bent
There should be a screw on the bobbin holder. This screw is on the side of the bobbin casing. (Bobbin holder removes to put the bobbin into). Most models have this. Turn the screw clockwise to increase tension. Run a stitch and check the underside of the fabric to see the stitches. If they look loose or sloppy still, turn the screw more, if they look too tight(pulling) then you have gone too tight. Hope that this helps!
birdsnest refers to a mess of thread on the underside of fabric when you start sewing (after a few stitches all looks good). if this is the case and it is happening during embroidery, switch off jump stitch thread cutting.
if it happens at the start of normal sewing, either hold your needle thread when you start sewing or make sure the needle thread is under the presser foot and held by the presser foot when you start sewing. this way you will have an inch or so of thread on top of your fabric which you can trim instead of a mess underneath.
if there is a mess underneath for more than first few stitches, either your check spring in the needle tension area is set incorrectly, or your needle tension is set too loose (adjustable in sevice menu by tech only) or there is foreign matter caught in tension assembly preventing proper tension.
If the top stitch is loose, then you need to tighten the bobbin tension: if the bottom stitch is loose, tighten the top tension. Hope this helps. It could also be the size needle and thread you are using for a particular fabric. Different fabrics require different notions.