Threading the bobbin is the first step before you sew
To thread a bobbin on a Brother sewing machine, you wind thread onto an empty bobbin using the machine's built-in winding mechanism, then place the wound bobbin into the bobbin case below the needle. The process takes about two minutes once you know where each part is. Most Brother machines follow the same basic steps, though the exact location of the bobbin winder and case varies slightly between models.
You will need an empty bobbin (plastic or metal, depending on your machine), thread that matches the thread already in your needle, and your Brother machine's manual if this is your first time. The manual shows a diagram specific to your model and is worth keeping nearby.
Key Takeaways
- Wind thread onto the bobbin using the winder on the side or top of your machine before you place it in the bobbin case.
- The bobbin winder has a tension disc that you thread through; skipping this step causes loose, uneven bobbin thread.
- Wind slowly and stop as soon as the bobbin is full — overfilled bobbins jam and cause skipped stitches.
- Once wound, insert the bobbin into the case with the thread tail pulled through the tension spring, or your machine will not catch the bobbin thread.
- If stitches look loopy or uneven on the bottom of your fabric, the bobbin thread is usually the problem, not the top thread.
Locate the bobbin winder on your machine
On most Brother machines, the bobbin winder is mounted on the top right or top left of the machine body. It looks like a small spindle or post with a tension disc (a metal or plastic ring) around it. Check your manual to find the exact location on your model — some compact machines place it differently.
Before you start, make sure the presser foot is up. This disengages the tension discs on the main needle area, which is necessary for the bobbin winder to work properly. If the presser foot is down, the bobbin winder will not grip the thread correctly and the bobbin will wind loosely.
Wind thread onto an empty bobbin
Place an empty bobbin onto the bobbin winder spindle. The bobbin should sit flat and slide all the way down until it stops. If your machine uses a bobbin case with a removable bobbin, use a bobbin designed for your specific model — Brother bobbins are not always interchangeable between machines.
Pull thread from your spool and guide it through the tension disc on the winder. This is the critical step most people skip. The tension disc looks like a small slot or notch; thread the working thread through it so the disc holds light pressure on the thread as it winds. Without this step, the bobbin winds too loosely and causes tension problems later.
Hold the thread end and tap the foot pedal gently or press the start button (depending on your model). The bobbin will begin to spin. Let it wind until it is completely full — you will see the thread build up in layers around the bobbin. Most Brother machines have an automatic stop that cuts power to the winder when the bobbin is full, or the winding will slow noticeably. Stop when ready; an overfilled bobbin will jam in the case.
Cut the thread close to the bobbin with scissors. You now have a wound bobbin ready to insert into the machine.
Insert the bobbin into the bobbin case
Open the bobbin door or cover on the front of your machine. On most Brother models, this is a hinged plastic panel below the needle. Pull it toward you or lift it up, depending on your model. Inside you will see the bobbin case — a small metal or plastic chamber where the bobbin sits.
Hold the wound bobbin with the thread tail pointing upward and to the left. Insert it into the case so it sits flat on the bottom. The bobbin should spin freely; if it feels stuck, remove it and check that it is not overfilled or damaged.
Pull the thread tail through the tension spring. This is a small metal or plastic clip inside the bobbin case that holds the thread under light tension. The thread should sit in the groove or slot of this spring. If you skip this step, the bobbin thread will be too loose and your stitches will look loopy on the underside of your fabric.
Close the bobbin door and you are ready to thread the needle and begin sewing.
What to do if the bobbin winds too loosely or too tightly
If you wind a bobbin and it feels soft or squishy, or if the thread is visibly loose on the bobbin, the thread did not pass through the tension disc. Unwind the bobbin by hand or rewind it, making sure to guide the thread through the tension disc first. A loose bobbin will cause uneven stitches and thread breakage.
If the bobbin is hard to turn by hand or the thread is wound so tightly it looks shiny and compressed, you wound too fast or the tension disc was too tight. This is less common but can happen if you hold the thread too firmly while winding. The next bobbin will improve if you wind more slowly and let the tension disc do the work.
Signs the bobbin is threaded incorrectly
The most obvious sign is loopy stitches on the bottom of your fabric — the underside looks like loose loops instead of tight, even stitches. This usually means the bobbin thread is not under tension, which happens when the thread is not seated in the tension spring or the bobbin is wound too loosely.
Another sign is thread breakage. If the bobbin thread keeps breaking during sewing, check that the bobbin is not overfilled (causing it to jam) and that the thread is actually threaded through the tension spring. Broken bobbin thread can also mean the bobbin case itself is damaged or has a rough spot; if you see a burr or crack, the case may need to be replaced.
If the top thread breaks but the bobbin thread is fine, the problem is usually in the needle area, not the bobbin. Check that the needle is inserted correctly and that the top thread is threaded through all the guides.
Frequently Asked Questions
Can I use any bobbin in my Brother machine?
No. Brother makes different bobbin sizes and styles for different machine models. Check your manual or the bobbin case itself for the correct type. Using the wrong bobbin can cause it to jam or wind incorrectly. If you are unsure, bring your machine to a Brother dealer or check the Brother website for your specific model number.
Why does my bobbin keep jamming?
The most common cause is an overfilled bobbin. Stop winding as soon as the bobbin looks full; do not try to squeeze more thread on. A second cause is a damaged bobbin case with a rough edge or burr. Run your finger carefully inside the case; if you feel a snag, the case may need replacement.
Do I need to rewind the bobbin every time I change thread color?
Yes, if you want the bobbin thread to match the top thread. You can leave a partially wound bobbin in the case and use it later, but most sewers wind a fresh bobbin when they change colors to avoid visible thread on the underside of the fabric.
What if the bobbin thread is not catching at all?
First, make sure the bobbin is actually in the case and the thread is pulled through the tension spring. Second, check that the presser foot was up when you wound the bobbin. If the presser foot was down, the main tension discs were engaged and the bobbin wound too loosely. Rewind with the presser foot up and try again.
Can I wind a bobbin while the machine is running?
No. Always stop the machine and raise the presser foot before winding a bobbin. Winding while the machine is running can cause the thread to tangle or the bobbin to wind unevenly.