Fix your sewing machine
Nine times out of ten, it isn't the machine 'acting up' — it's the threading. The 7 most common problems, their real causes, and how to fix them in a few minutes.
A machine that jams or does something strange is scary — especially in the middle of a project. Good news: most problems come from mis-threading, not a mechanical fault. Here are the 7 most common situations, roughly in the order they tend to come up.
1. "Bird's nest": a tangle of thread under the fabric
Cause number one, almost always: the top thread is not seated in the tension discs. This typically happens when you thread the machine with the presser foot down — the discs are closed, and the thread slips past without going in.
Rethread the top thread completely with the presser foot up. With the foot up, the tension discs open and the thread seats properly between them — this single move fixes 90% of bird's nests.
Cut away and remove the tangle, clean out the bobbin case, and put in a neatly wound bobbin. Before sewing again, lower then raise the needle once by hand to bring up the bobbin thread, and hold both threads toward the back for the first stitches.
2. The top thread keeps breaking
Most often, the machine is mis-threaded or the thread skipped a guide. Rethread completely with the foot up, following every guide up to the take-up lever at the top. If it keeps happening: lower the top tension by one or two notches, and above all change the needle — it's a wear part, and a fresh one fixes a lot of issues. Also check it's pushed all the way up, flat side facing back.
3. The machine skips stitches
Change the needle first: it's often fixed right away. On jersey or knit, use a ballpoint needle (round tip) instead of a universal one — it slips between the loops instead of piercing them. Check it's pushed all the way up, rethread the machine with the foot up, and match needle size to thread size.
4. Stitches are uneven: too loose on top or underneath
Before touching the tension setting, rethread the top completely (foot up) and the bobbin — 8 times out of 10, that's the problem. Then read the flaw: loose loops under the fabric mean the top tension is too loose (raise it); loops on top mean it's too tight (lower it). Turn the dial in small steps and test on a scrap each time.
5. The needle breaks or bends
Cause number one: you're pulling or pushing the fabric while sewing, which deflects the needle. Let the machine feed it, just guide it with your fingertips. Never sew over a pin. For denim or several layers, put in a new jeans needle (size 90 or 100), flat side facing back — and check the foot and plate match the chosen stitch (a zigzag needs a wide-hole foot and plate).
6. The fabric doesn't move, it stays in place
The number one oversight: the presser foot isn't down. Check that first. Then find the little lever or button for the feed dogs (often at the back or under the free arm) and raise them if they're dropped, and set the stitch length back to about 2.5. Don't pull or push the fabric: the machine feeds it on its own, just guide it.
7. The machine is jammed, the handwheel won't turn
Never force the handwheel: you could bend parts. Turn it gently by hand in reverse (toward you) to free whatever is stuck, with the foot and needle raised as high as possible. Nine times out of ten, a tangle of thread is stuck under the fabric or in the bobbin case — open the bobbin door, take out the bobbin and clear it with tweezers. Also check the bobbin-winder spindle (top right) is pushed left (sewing position), not right (winding position).
In short
Rethreading with the foot up and a fresh needle fix most problems — before suspecting the machine, always start there. For deeper troubleshooting (18 detailed cards with diagrams, by type of problem), the "Machine" space in the app's Library covers jams, settings and maintenance, ready to consult mid-project without searching the web.