SOURCE: how do I adjust the bottom thread tension?
some machines have a nob on the front loose is low numbers like 0 1 -2 most machines work well on number 3. If the nob is not on the front check and see if it is on the side.
SOURCE: My Bernina 930's lower tension
Hi - you might have a dirty bobbin case, or need a new one. IAfter awhile, little teeny dust bunnies can collect in your bobbin case and cause your bobbin tension to go wonky, especially if you use cotton thread. If you happen to have an extra bobbin case, try using the new bobbin case to see if that solves the problem. Otherwise.....
In general, you should oil your machine as indicated in your manual as often as directed. You should change your needle every 10 hours of sewing - or each time you start a new project, and you should take your machine in for service every one or two years - even if you only use it once and awhile.
Hope this helps, Ginny
SOURCE: Zigzag stitch pulling tight, looks wrong
Try adusting the bobbin thread instead of the top. Always make sure to insert the bobbin so the thread is pulling in a clock wise direction. Both threads top and bobbin should have about the same resitance when pulled.
SOURCE: bottom tension to tight
There's hardly any way to significantly adjust the bottom, or bobbin tension. There's just a small, flat spring attached to the side of the bobbin case, under which the thread runs. There's adjustment there. You need to adjust the top thread tension via the small thumbscrew that's against the plates on the top thread tension discs. Increase or decrease tension there until top and bottom threads are equally centered between layers of material.
You can adjust presser foot tension with the knurled nut at the top of the machine. I never had the kind of problem you mention though. I set my machine at about 6 stitches per inch or a little more (max is 5, recommended), and presser foot tension is only heavy enough to pull a single layer of material through.
Hope this helps.
SOURCE: tension problem
.There is a little screw attached to the bobbin carrusel. You can try
to turn it just a little bit. The reason is that this carrusel gets
loose after a while.
Clean and oil your machine at least monthly.
Hope something helps!
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