Rethreading fixes most tension problems and jams
If your sewing machine is skipping stitches, bunching thread, or making loud grinding sounds, the thread is usually out of the needle or wound incorrectly through the tension discs. Rethreading takes five minutes and solves the problem in most cases. The process is the same whether you own a basic mechanical machine or a computerized one—you raise the presser foot, remove the old thread, and guide new thread through the same path it came from.
The reason rethreading works is that thread must sit in the correct grooves and tension points for the machine to form a balanced stitch. When thread slips out of even one guide, the whole system falls apart. This guide walks you through the exact sequence, using the parts your machine actually has.
Key Takeaways
- Always raise the presser foot before rethreading, because the foot opens the tension discs and lets thread pass through.
- Thread the needle with the presser foot up and the machine unplugged, then lower the foot before sewing.
- Follow the thread path marked on your machine's body—usually arrows or a printed line showing where thread goes.
- If you cannot see the thread path on your machine, check the manual or search your machine's model number plus "threading diagram" online.
- Rethreading the bobbin (the small spool underneath) uses a different path and is a separate task from upper threading.
Gather what you need before you start
You need thread that matches your project, a fresh needle, and your machine's manual or a threading diagram. If you do not have the manual, write down your machine's brand and model number (usually on a sticker on the back or side) and search online for "[brand] [model] threading diagram." Most manufacturers post these as free PDFs.
Have scissors or thread snips within reach. You will cut the old thread to remove it, and you may need to trim the thread end to a clean point so it slides through the needle eye easily. A magnifying glass or phone flashlight helps if the needle eye is small or your vision is not sharp.
Step 1: Raise the presser foot and unplug the machine
The presser foot is the metal arm that holds fabric down while you sew. Raise it by hand or by pressing the lever on the back of the machine—the exact location depends on your model. Raising the foot opens the tension discs inside the machine, which are two metal plates that grip the thread. If the foot is down, the discs are closed and thread cannot pass through.
Unplug the machine from the wall outlet. This prevents the needle from moving if you accidentally touch the foot pedal or a button. It takes only a few seconds and keeps your fingers safe.
Step 2: Remove the old thread and cut it away
Snip the thread above the spool with scissors or thread snips. Pull the thread out of the needle by hand. Then pull the thread downward through the machine, following the same path it came from—through the tension discs, the guides, and the thread take-up lever. You may feel slight resistance as it passes through the tension discs; that is normal.
Do not yank hard or pull sideways, because you can bend the guides or knock the tension discs out of alignment. Steady, downward pressure works better. Once the old thread is out, the machine is ready for new thread.
Step 3: Insert the spool and guide thread to the tension discs
Place the new spool on the spool pin at the top of the machine. The spool pin is a thin rod, usually on the right side of the machine's top. Slide the spool onto the pin so it sits flat and does not wobble. If your machine has a spool cap (a small plastic disc), place it on the pin after the spool to hold it steady.
Pull the thread from the spool and guide it into the first guide or hook at the top of the machine. Most machines have a guide shaped like a small hook or loop. Follow the printed arrows or line on the machine's body. The thread should pass through this guide and then down toward the tension discs, which are usually two metal plates stacked together below the guide.
Step 4: Thread through the tension discs and take-up lever
The tension discs are the critical part. Guide the thread between the two metal plates by sliding it in from the side. You should feel it settle into place with a soft click or catch. The thread now sits in the groove between the discs, and the discs will grip it when you lower the presser foot.
After the tension discs, the thread goes up and to the side into the thread take-up lever, a small hook or arm that moves up and down as you sew. Guide the thread through this lever from left to right (or the direction shown on your machine). Then the thread comes back down toward the needle, passing through any remaining guides or hooks on the way.
Step 5: Thread the needle and lower the presser foot
The needle is at the bottom of the thread path. Hold the thread taut with one hand and guide it through the needle eye from front to back. If the thread frays and will not go through, trim the end with scissors to make a clean point, then try again. Some machines have a needle threader—a small wire loop on the machine body. If yours does, hook the loop through the needle eye, pass the thread through the loop, and pull the loop back out; the thread comes with it.
Once the thread is through the needle, lower the presser foot by hand or by pressing the lever. Lowering the foot closes the tension discs and locks the thread in place. The machine is now threaded and ready to sew. Before you start a project, turn the hand wheel (the large wheel on the right side of the machine) toward you two or three times to make sure the thread moves smoothly and the needle does not catch.
What to do if the thread still does not work
If you have rethreaded and the machine still skips stitches or bunches, the problem may be the needle itself. Needles bend, dull, or break during sewing, and a damaged needle will not form a stitch no matter how well the thread is threaded. Replace the needle with a fresh one of the same size and type, then rethread. Most machines use standard needles that cost a few dollars for a pack of five.
If a new needle and rethreading do not solve it, the tension may need adjustment, or the bobbin (the lower thread) may be wound incorrectly. Bobbin problems are a separate issue from upper threading. Check your manual for bobbin winding instructions, or call the machine's manufacturer—many have phone support lines that can walk you through diagnosis over the phone at no cost.
Frequently Asked Questions
Do I have to unplug the machine to rethread?
You do not have to, but it is safer. Unplugging takes five seconds and removes the risk of the needle moving if you bump the foot pedal. If you prefer to leave it plugged in, make sure the presser foot is up and keep your hands away from the needle area.
What if I cannot find the thread path on my machine?
Look for printed arrows or a thin line on the machine's plastic body showing where thread goes. If you do not see one, search online for your machine's model number plus "threading diagram"—manufacturers almost always post these for free. You can also call the machine's customer service line and ask them to describe the path.
Can I rethread while the presser foot is down?
No. The presser foot must be up, because it opens the tension discs. If the foot is down, the discs are closed and thread cannot pass through them. You will feel resistance and may bend the thread or damage the discs if you force it.
Why does my thread keep coming out of the needle?
The needle may be inserted backward or upside down. Most needles have a flat side and a rounded side; the flat side faces a specific direction depending on your machine brand. Check your manual for the correct orientation, remove the needle, flip it, and reinsert it. Then rethread.
Is rethreading the same for the bobbin?
No. The bobbin is the small spool of thread underneath the machine, and it has its own separate winding and threading process. Bobbin problems are usually about how the bobbin was wound, not about rethreading the upper thread. If the lower thread is the issue, check your manual for bobbin winding steps.