Empisal pacesetter,
Not sure what you mean by "tacking" stitch. Are the stitches exceedingly long like a basting stitch? That would need a stitch length adjustment so stitches are closer together.
Or, do you mean the tension is loose between stitches? You can try tightening the top tension to see if that helps. (Be sure to ALWAYS RAISE the presser foot when threading the top thread so the thread will seat completely in the tension disk or you may end up with lots of top thread showing under the fabric.) If the bobbin thread is too loose, you may need to adjust its tension.
Understanding Thread Tension Threads
SOURCE: bobbin tension
If the looping is happening on the underside, it is your top tension that is to blame, conversely looping on top is bobbin tension.........take a look HERE for detail on cleaning lint buildup.
Top tension should be set around the middle of the range, usually 4 - 6.
I would not advise playing with bobbin tensions, however, you can take the needle plate off to clean the hook race area (where bobbin case sits) ...this is good housekeeping, my wife does this every time she replaces the bobbin....just take it out and clean the bobbin case and the fixed metal hook race with a small brush to remove lint, if there appears to be fine dirty deposits, a cloth or cotton bud (Q tip) moistened (not soaked) with methylated spirit will do the trick.
Bargainbox
SOURCE: Wrong type of stitch/tension not working
Found a solution to my own problem.... hope this helps someone else. Make SURE the bobbin case is seated correctly! (follow the instructions carefully). Don't put the cover back on right away after you put the bobbin case in. First check and make sure it doesn't move when you turn the hand wheel.
Also, when threading the bobbin make sure the thread passes down through the tension adjusting spring of the bobbin case.
SOURCE: Singer CG 550 Top thread keeps wraping around the bobbin and jam
Have you checked the top thread is correctly placed in the spring of the bobbin case?
SOURCE: singer simple sewing machine will not sew
need needle threading instructions singer 3116 simple. pictures would help. thank you
SOURCE: Bobbin tension on Viking 350 Sewing Machine
Viking bobbin case tension adjustment:
When the bobbin runs out, sometimes it bends the bobbin case tension spring. Then tension is too light. Take the bobbin case out of the machine. Tie the loose bobbin thread to the Designer 1 needle plate. Insert the bobbin in the bobbin case. Here’s the tricky part set the bobbin case on the table as if it’s in the machine (Bobbin is visible and sitting horizontal to table top) threaded as if sewing and loose end tied to needle plate (that is removed from the machine). Lift the bobbin case off the table rotate it so that the flat side of the bobbin are vertical to the table and no longer horizontal. Have the bobbin case oriented so that the thread coming out of the bobbin case sprint (slot area where it is put for sewing) is at the top. Lift it high enough that the needle plate is lifted from the table. It should not release thread unless you shake it gently and then a very small amount of thread. The needle plate is the exact weight resistance your bobbin case should have on the thread.
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