Hi Bettyme2.
just found this on the web.
Try rethreading the top. A sewing machine repairman told me one time that if the top messes up rethread the bottom and if the bottom messes up rethread the top. Check for lent in the bobbin area too. Don't use canned air but a soft clean brush. Hope this helps.
or try this link out.
https://www.google.com/search?q=Thread+bunching+on+Activa+230&rlz=1C1AVFC_enGB797GB798&oq=Thread+bunching+on++Activa+230&aqs=chrome..69i57.9137j0j4&sourceid=chrome&ie=UTF-8
SOURCE: I have a Consew 230 it works fine on thin soft
I would try a fatter needle and probable lessen the thread tension.
SOURCE: Thread knotting up on underside of fabric
Try rethreading with a new needle. Make sure presser foot in up position when you rethread. Thread needle with flat side in back and more rounded side facing you. Make sure you pull the thread taut as you insert the thread into all of the tension disks.
Clean out the shuttle and the feed dogs with gentle handling of your small sewing machine lint brush. Sometimes broken thread, lint, and threads from your fabric get caught in these areas and are not visibile until you get the brush bristles in there.
Make sure your top tension is on a medium number and that your pattern setting matches the stitch you wish to perform.Also make sure your needle size matches the fabric weight. Another fix if it isn't anything I have mentioned so far, there is a foot pressure regulator on the left-hand side of your machine which controls the pressure of your presser foot. Turn it (some push up and down) just a tad in either direction and recheck with a scrap of fabric to see the results.
Hope this helps!
Jimmy
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