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Hi. Chances are your upper thread tension may need to be adjusted, increasing it by very small amounts at a time (say one tenth of one whole number), see if the stitching on the bottom improves. Another possibility is that the bottom fabric is moving around. Try pinning top and bottom together with straight pins set at a right angle to the stitch line. A third possibility could be lower thread tension set to tight. If the lower tension screw is all the way in, this is likely your problem.
First locate the sewing machine tension gauge. Sometimes its called a knob or a button or found on your Touch Screen if you have a computerized machine. Refer to your manual if you can't find it.
Either your needle thread is too tight or your bobbin thread is too loose.
First check that your bobbin thread hasn't slipped out of its tension spring in the bobbin case.
If the bobbin thread is correctly threaded through the tension spring, then decrease your needle tension by 1 number. Test by stitching several inches on your small quilt sandwich. Keep decreasing the tension until no needle thread is visible on the quilt top.
If sewing machine tension problems occur during the middle of a quilting session, again, first refer to the checklist above. Once you're satisfied that your sewing machine is threaded properly and your needle is not the culprit, then adjust the tension as outlined above.
If you have just started testing your quilting thread choices and you are using different threads for the needle and bobbin, you will in all probability make adjustments to your tension.
Make a small quilt sandwich from the materials used in your quilt to make this sandwich. It doesn't have to be pretty or even pin basted. It should be just big enough to test some of the stitching you plan to do on your quilt.
For all sewing machines, if the bobbin thread is showing on the top surface, then the top tension is probably too tight. Turn the tension indicator to the left by half a number to a lower value. (So that if 5 was lined up with the dot initially, then go to 4.5 lined up with the dot).
The bottom side is effected by the TOP tension. First make sure the top is threaded correctly. Best thing to do is completely unthread it and then thread it again. Then check the tension and make sure it is not too loose. Check the needle to make sure it is inserted correctly and not bent.
Once you've done that then you can take a look at the bobbin tension and make sure it isn't too loose too. Make sure the bobbin is in the case correctly, wound correctly and that the bobbin case is completely inserted right. You will hear and or feel a slight "click" when it goes in correctly,
Check your tension first by sewing a wide zig zag stitch. Does the top of the stitch and the bottom look identical? The sides of the stitch should look like a hole where the thread disappears to the other side, with no extra thread from the other side coming through. It also should lie flat and not be puckering in the middle. When it looks identical and no puckering the tension is correct. Use the same type of material and thread you will be using for the embordery. The bottom side of the stitch is effected by the TOP tension. The top side of the stitch by the BOTTOM tension.
Are you stretching the material you're hand embordering with a hoop?
The dog feed needs to be totally down and if your machine has an adjustment the tension on the foot should be lessened too. (not all machines allow for that adjustment).
Last but not least make sure you have the right needle for the job and material.
Jamming up in the bobbin area would most likely be from the top tension being too loose but also make sure the material isn't getting pulled down in by stretching it with an embordery hoop. Do use a presser foot... a wide clear one is best.
I haven't sewn in years. A sewing machine has a tension control on top and on the bobbin. If the intersection of the top and bottom threads is not in the middle of the sewn material, you have to adjust your tension.
In your case, what I think you are saying is that the stitch on top is just a straight line and on the back it disappears into the fabric.
To correct this, lower the top tension by loosening the tension adjuster on the thread where the thread loops around the small pulley.
Also, you could tighten the tension on the bobbin by slightly tightening the small screw on the side of the bobbin.
Hello there, loosen your top thread tension,if it looping on top of the material the tension is way too tight, you will also find changing the thread size to smaller thread, the top tension will also reduce,depending on application a good size thread to use is 25 grade,bobbin tension should have just a slight amount of drag as the top thread and bottom work against each other when sewing.