Question about Singer Drop-In Bobbin 758B-28BH Mechanical Sewing Machine

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Sewing machine When sewing the top layer looks fine but underneath it is messy. Any suggestions or soluitions. Thanks

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The top tension pulls the top thread up. The bobbin tension pulls the bottom thread down. A balanced tension is an an even knot between the stitches.

If the thread is messy on the bottom, the top tension is non-existent or is too low. The top thread tension dial should be on 4 or 5. Pull the thread out and re-thread the machine with the presser foot up. If it is still messy, perhaps there is a burr on the bobbin case snagging the thread.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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First, install a brand new needle, perhaps a top-stitch needle will work better because it has a groove in the shaft that protects the thread. Make sure the needle is the appropriate size for the thread you are using--a needle eye that is too small will cause the thread to hang or shred. When the needle penetrates the sandwich, the top thread forms a loop. If the eye is too small, the thread will not come back up through the sandwich, leaving a loop under the fabric.

Remove the top thread from the machine.
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I don't believe you will have to adjust the bobbin tension, but in case you do, be very careful. Mark the tension screw setting FIRST so you can reverse any changes you make. Bobbin adjustments are made in very SMALL increments. Because I tend to use a lighter weight thread for my quilting, I have a specific bobbin case that is adjusted for my quilt thread and I keep my other bobbin for regular sewing. Then I don't have to keep adjusting the bobbin tension when going from sewing a quilt to something else.

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Hi. The upper tension is too loose (even tho it looks ok). If the upper thread is too loose, it can't pull the bobbin thread up to properly form the stitch and you get those messy 'birds nest' on the bottom side of the fabric. I posted a Tip on Adjusting Tension--read that and adjust your upper tension.

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Check out this site. All the Q&A answers in simple language, as well as a GREAT cust. support staff. (its a Brother after all!)


http://welcome.solutions.brother.com/BSC/public/us/us_ot/en/model_top/HomeSewingMachine/hf_ls1217eus.html?reg=us&c=us_ot&lang=en&prod=hf_ls1217eus

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