Troubleshooting skipped stitches on a sewing machine

Work through the likely causes in order before you touch any setting, because most skipped stitches come from the needle, the thread path or lint in the hook area. Skipped stitches happen when the hook fails to catch the loop of upper thread that the needle carries down, so no stitch is formed on that pass. Timing faults do occur, but they are less common than a worn needle or a missed thread guide, and a fixed sequence of checks saves time.

Changing the tension or stitch length rarely fixes skipping on its own. Those settings change how a stitch looks, while skipping is a failure of the loop to form, so start with the parts that touch the thread directly.

What the skip is telling you

A skip that happens at the same point every time often points to one cause, such as a bent needle that deflects at the same place on each pass. A skip that appears randomly, especially at higher speed or on thick seams, more often points to fabric handling, thread or lint. Watch the pattern. If skipping happens when you start or stop, look at the needle and the thread tail. If it happens in a heavy area of a seam, look at the needle size and the thread weight.

Work through the fixes in order

Try these steps in sequence, testing on a scrap of the same fabric after each one:

1. Replace the needle with a new one of the right type and size for the fabric. Insert it with the flat side toward the back and push it all the way up before tightening the screw. A bent, blunt or incorrectly seated needle is one of the most common causes of skipping.
2. Rethread the upper thread with the presser foot raised, following every numbered guide and passing the thread through the tension discs.
3. Check the bobbin. Make sure it is wound evenly, seated in the case in the correct direction, and that the bobbin thread runs through the tension spring.
4. Clean the bobbin area and the hook race of lint, then check the needle plate for debris. Lint between the hook and its race can stop the hook from catching the loop cleanly.
5. Try a fresh spool of good-quality thread of the correct weight. Old, twisted or very fine thread can break or shed, and it may skip more at speed.

If a new needle, correct threading and a clean hook still produce skipped stitches, move on to the sections below rather than repeatedly changing the tension, since the next likely cause sits in how the fabric is handled or in the timing.

Fabric handling and the thread path

Fabric handling is an overlooked cause. Pulling or pushing the fabric while you sew deflects the needle and can make the hook miss the loop. Let the feed dogs move the fabric and guide it lightly. Thick seams, such as where many layers overlap, need a slower speed and, often, a larger needle. Stretch fabrics are a special case, because the loop can be pulled out of position as the fabric moves; a stretch needle and a suitable stitch can help.

Speed matters on difficult fabric. Sewing at full speed through thick layers or stretch fabric gives the hook less time to catch each loop cleanly. Slowing down with the speed control often clears skipping that appears only in one part of a project, and it costs little time.

Check the thread path once more, especially the take-up lever and the guide above the needle. A thread that is not held by the tension discs can flutter and miss the hook. The thread should run smoothly from the spool to the needle without catching, and the tail should not be trapped under the presser foot when you start.

When to stop and call a technician

If skipping continues after a new needle, clean threading, a clean bobbin area and good thread, the cause may be the timing between the needle and the hook. Timing describes how the needle's movement and the hook's position stay synchronized, and it can drift after a hard knock, after the machine is dropped or after heavy use. Checking or correcting timing requires the manual's specified positions and sometimes a timing gauge, so a qualified sewing machine technician should handle it.

Stop sewing if you notice grinding, a burning smell, sparks or a handwheel that will not turn smoothly. Unplug the machine and seek a technician rather than forcing the handwheel. Do not attempt to adjust internal parts that the manual does not describe, since a small misalignment can damage the needle, the hook or the throat plate and make the problem worse.

Most skipped stitches are solved by a new needle and a careful rethread. Keep the order fixed and change one thing at a time, so you know which fix worked. If the skipping returns after every correction, that pattern is a strong sign that the machine needs professional attention.