Why does the thread break on my VALBERG VB-MAC.2 sewing machine and how can I solve this problem?

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The thread breaking on your VALBERG VB-MAC.2 sewing machine can have several causes, but they are generally related to the needle, thread tension, or threading. Here’s how to diagnose and fix this issue.

First, check the needle: Thread breakage is often caused by a bent, dull, or improperly positioned needle. Before doing anything else, replace the needle with a new one. Make sure the needle is inserted correctly with the flat side facing the back of the machine and pushed up as far as possible. Also, check that you are using the correct needle size for your fabric: 11/80 needles for lightweight fabrics, 14/90 for medium fabrics, 16/100 for heavy fabrics.

Check the upper thread threading: Incorrect threading causes thread jams and breakage. Turn off the machine and unplug it. Raise the presser foot lifter (very important). Raise the needle to its highest position by turning the handwheel towards you. Thread according to the path indicated on the machine: the thread goes under the slot to the right of the thread guide, wraps around the tension guide, descends into the tension channel, and comes back up on the other side. Perform this simple test: with the presser foot raised, the thread should slide easily when you pull; with the presser foot lowered, the thread should resist significantly. If there is no increase in tension, the threading is incorrect, start over.

Adjust the thread tension: On the tension dial (numbered 1 to 9), settings 3, 4, and 5 are marked with a small square and correspond to the recommended adjustment range for most stitches. If the thread breaks, loosen the tension by selecting a number within this range (3 to 5). Too high a tension causes breakage.

Check the bobbin: This VALBERG VB-MAC.2 machine uses only magnetized metal bobbins of type 15K. Never use clear or plastic bobbins, even if they seem to fit, as they will not provide the correct tension and you will have thread breakage issues. Ensure that the bobbin is correctly positioned: it should turn counterclockwise when the thread unwinds. Also, make sure the bobbin is not empty or poorly wound.

Check the presser foot: If the presser foot is too loose, the thread is not held properly and may break. Check that it is tight and in good condition.

Follow these steps in order: first replace the needle, then rethread the upper thread with the presser foot lifter raised, adjust the tension between 3 and 5, and check that you are using magnetized metal bobbins of type 15K. These checks eliminate most thread breakages.

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