What sewing machine timing is and why it drifts
Timing on a sewing machine is the precise coordination between the needle and the bobbin hook — the small metal part that catches the thread from the needle to form a stitch. When timing is correct, the hook catches the needle thread at exactly the right moment in the needle's up-and-down cycle. When timing drifts, stitches skip, loops form on the fabric surface, or the machine jams.
Timing can drift from normal wear, a bent needle that was never replaced, hitting a pin while sewing, or dropping the machine. Unlike needle threaders or presser feet, timing adjustment is not a task most home sewers should attempt — the adjustment requires removing the machine's face plate and moving the hook or cam timing wheel by fractions of a millimetre, and getting it wrong can damage the hook or needle bar. This is one of the few sewing machine repairs that belongs with a technician.
Before you assume timing is the problem, rule out the simpler causes: a bent or dull needle, incorrect needle insertion, wrong needle type for your fabric, improper bobbin winding, or a bobbin case that is not seated fully. Most skipped stitches come from one of these, not from timing.
Key Takeaways
- Timing is the coordination between the needle and bobbin hook, and when it drifts, stitches skip or loops appear on the fabric surface.
- A bent needle, wrong needle type, or improperly wound bobbin causes most skipped stitches — check these before assuming timing is the problem.
- Timing adjustment requires removing the machine's face plate and moving internal parts by tiny amounts, which is a job for a professional technician.
- A technician can usually adjust timing in one visit and will test the machine before returning it to you.
How to tell if timing is actually the problem
Start by replacing the needle with a fresh one of the correct type and size for your fabric. A bent needle or one that is dull will skip stitches even if timing is perfect. Insert the new needle fully into the needle clamp — it should go all the way up until it stops, then tighten the clamp screw firmly.
Next, rewind your bobbin by hand on the machine's bobbin winder, making sure the thread winds evenly and smoothly without bunching. A bobbin that is wound too loosely or unevenly will cause tension problems that look like timing issues. Then remove the bobbin case (if your machine has a removable one) and make sure it clicks fully back into place — a case that is not seated all the way will cause skipped stitches.
Thread the machine with the presser foot up, not down. The presser foot lever opens the tension discs; if you thread with the foot down, the thread will not sit properly between the discs and you will get loose stitches or skips. Sew a test line on scrap fabric using the same thread and needle size you plan to use for your project.
If stitches still skip after you have done all of this, timing may be the issue. If loops appear on the top of the fabric, the top tension is too loose or the bobbin is wound too tightly. If loops appear on the bottom, the top tension is too tight or the bobbin is wound too loosely. Adjust tension before you assume timing is wrong.
What a technician will do to adjust timing
A sewing machine technician will remove the machine's face plate or side cover to access the hook and needle bar. They will manually turn the hand wheel (the large wheel on the side of the machine) to move the needle through its full cycle while watching the hook position. The hook should catch the needle thread at a specific point in that cycle — usually when the needle is at its highest point or just beginning to rise.
If the hook is catching too early or too late, the technician will loosen the hook assembly or cam timing wheel and shift it by a small amount, then test by turning the hand wheel again. This process repeats until the hook and needle are synchronized. The technician will then sew test seams to confirm the fix worked, check that the machine does not jam, and reassemble the machine.
The cost of timing adjustment varies by technician and region, but typically ranges from $50 to $150 depending on how far the timing has drifted and whether other parts need cleaning or adjustment while the machine is open. Some technicians charge a flat rate for a full tune-up that includes timing, tension, and cleaning.
When to take your machine to a technician
If you have replaced the needle, rewound the bobbin, reseated the bobbin case, threaded with the presser foot up, and adjusted tension, and stitches still skip consistently, timing adjustment is likely needed. Do not try to adjust it yourself — the adjustment requires tools you probably do not have and the risk of damaging the hook or needle bar is high.
Find a technician by searching for "sewing machine repair" plus your city name, or ask at a local fabric or quilt shop — they usually have a technician they recommend or may do repairs in-house. Call ahead and describe the problem (skipped stitches, loops, jamming) so the technician can tell you whether timing is likely and what the cost will be.
Bring your machine with the presser foot up and the needle in the highest position — this is the safest way to transport it and helps the technician see the current needle position right away. If you have the manual for your machine, bring that too; some machines have timing marks or special procedures that the technician will need.
How often timing needs adjustment
Timing does not drift on its own if you use the machine normally. It drifts only after impact — dropping the machine, hitting a pin hard enough to bend the needle, or sewing over a thick seam that jams the needle. If your machine has never been dropped and you have not hit anything hard, timing is probably not the issue even if stitches are skipping.
A well-maintained machine that is used regularly may go years without needing timing adjustment. A machine that sits unused for months or years may develop timing drift straightforward from the internal parts settling, though this is less common than drift from impact.
Preventive care to keep timing stable
Always replace the needle before starting a new project, especially if the machine has been sitting. A bent or dull needle is the most common cause of skipped stitches and is also the cheapest and easiest fix. Keep needles in a dry place and discard any that have been dropped or bent.
Avoid sewing over pins — remove them as you approach them instead. Hitting a pin hard enough to bend the needle can also shift the hook timing. If you do hit a pin and hear a loud sound or feel resistance, stop when ready, remove the needle, and inspect it for bending before you continue.
Clean the bobbin area regularly with a small brush to remove lint and thread bits. Lint buildup can cause tension problems that mimic timing issues. If your machine has an oil port, follow the manual's instructions for oiling — do not over-oil, as excess oil can gum up the mechanism.
Frequently Asked Questions
Can I adjust timing myself if I watch a video?
Timing adjustment requires moving internal parts by fractions of a millimetre and knowing exactly where the hook should be at each point in the needle cycle. A small mistake can bend the hook or damage the needle bar, and the machine may not be repairable. This is one repair that is worth paying a technician to do correctly.
What is the difference between timing and tension?
Tension controls how tightly the top and bottom threads are pulled together in the stitch. Timing controls when the hook catches the needle thread. Tension problems are fixed by turning a dial; timing problems require opening the machine. Always adjust tension first — it solves most stitch problems.
Why does my machine skip stitches only on thick fabric?
Thick fabric can cause the needle to bend slightly as it pushes through, which throws off the timing temporarily. Use a needle one size larger for thick fabrics, and slow down your sewing speed. If skipping happens only on thick fabric and not on regular fabric, timing is probably not the problem.
How long does a timing adjustment take?
A technician usually completes timing adjustment in one visit, though the machine may need to stay for a few hours or a day depending on how busy the shop is. Call ahead to ask about turnaround time. Some shops offer same-day service for straightforward adjustments.
Will adjusting timing fix loops on the bottom of my fabric?
Loops on the bottom usually mean the top tension is too tight or the bobbin is wound too loosely. Try loosening the top tension dial by one or two numbers, or rewind the bobbin. If loops persist after you adjust tension and rewind the bobbin, then timing may be involved, but timing is rarely the only cause.