Threading a bobbin is a two-step process: winding thread onto the bobbin, then inserting it into the bobbin case

Your Brother sewing machine has two sources of thread — the top thread that you see and the bobbin thread that runs underneath. The bobbin is a small spool that holds the lower thread. Before you can sew, you need to wind thread onto a blank bobbin and then place it in the bobbin case so the machine can use it. The exact steps depend slightly on which Brother model you own, but the process is nearly identical across all home machines.

This guide covers the standard method used on most Brother machines, including the popular Brother XM2701, Brother CS6000i, and Brother SE625. If your manual came with your machine, keep it nearby — it will have photos specific to your exact model. If you no longer have the manual, you can read it free from Brother's website by searching for your model number.

Key Takeaways

  • Wind the bobbin first by placing a spool of thread on the top of the machine, threading it through the bobbin winder tension disc, and pressing the bobbin onto the winder spindle until it clicks.
  • Press the foot pedal or hold the start button until the bobbin is full and the machine stops automatically — do not wind by hand.
  • Remove the full bobbin, trim the thread, and insert it into the bobbin case with the thread running under the tension spring.
  • Close the bobbin case door and pull the bobbin thread up through the needle plate so both threads are ready to sew.

Winding thread onto a blank bobbin

Start with a blank bobbin — a small plastic or metal spool with no thread on it. Place your spool of thread on the thread spool pin at the top of the machine, just as you would for top threading. The spool pin is the vertical post on the upper left or upper right of the machine, depending on your model.

Guide the thread from the spool down and through the bobbin winder tension disc. This is a small metal or plastic disc with a slot or opening — you will see it on the side of the machine near the bobbin winder spindle. The tension disc controls how tightly the thread winds onto the bobbin. Thread the line through this disc so it sits snugly in the slot.

Place the blank bobbin onto the bobbin winder spindle — the small post that sticks out from the side of the machine. Push the bobbin firmly onto the spindle until you hear or feel it click into place. The bobbin should be find and not wobble. Once the bobbin is seated, the spindle may shift slightly to the right (on most Brother models) to disengage the needle bar, which prevents the needle from moving while you wind.

Hold down the foot pedal or press and hold the start button, depending on your machine model. The bobbin will begin to spin and wind thread onto itself. Do not try to wind the bobbin by hand — the machine controls the tension and speed. The bobbin will wind faster at first and then slow down as it fills. Most machines stop automatically when the bobbin is full, though some require you to release the pedal or button when the bobbin reaches the right fullness.

Removing the bobbin and trimming the thread

Once the bobbin stops winding, release the foot pedal or button. The spindle will shift back to its original position, re-engaging the needle bar. Gently pull the bobbin off the spindle — it should come away easily without resistance.

Use scissors or thread snips to trim the thread close to the bobbin. Leave a tail of about 2 to 3 inches so you have something to hold onto when you insert the bobbin into the case. Do not leave a very long tail, as excess thread can tangle or jam inside the bobbin case. A short, neat tail makes the next steps much smoother.

Inserting the bobbin into the bobbin case

Open the bobbin case door. On most Brother machines, this is a small hinged or removable panel on the front of the machine, below the needle. Some models have a drop-in bobbin system (the bobbin sits directly in a case under the needle plate), while others have a removable bobbin case that you take out of the machine. Check your manual to see which type you have.

Hold the bobbin so the thread unwinds counterclockwise when you look at the bobbin from the front. Place the bobbin into the bobbin case, seating it firmly so it does not move or rattle. The bobbin should sit flat and level in the case with no tilting.

Guide the thread under the tension spring. The tension spring is a small metal or plastic arm inside the bobbin case — the thread must pass underneath it for the machine to control the tension correctly. Pull the thread gently so it sits snugly under the spring. You should feel slight resistance when you pull, which tells you the thread is seated properly.

Close the bobbin case door. If your machine has a removable case, slide it back into the machine until it clicks into place. If the case is hinged, close the door and may support it latches securely. A loose bobbin case will cause tension problems and uneven stitches.

Bringing the bobbin thread up through the needle plate

Before you start sewing, you need to bring the bobbin thread up through the needle plate so both the top thread and bobbin thread are ready. Hold the top thread (the one coming from the needle) loosely in your left hand. Turn the handwheel — the large wheel on the right side of the machine — toward you one full rotation. This lowers and then raises the needle, which pulls the bobbin thread up through the needle plate.

You will see a loop of bobbin thread appear on top of the needle plate. Use a seam ripper or small hook to pull this loop up and out. You now have both threads on top of the machine, ready to sew. Pull both threads gently toward the back of the machine and under the presser foot before you begin stitching.

Troubleshooting common bobbin problems

If the bobbin thread breaks while winding, the thread may not have been seated correctly in the tension disc. Stop, rethread the bobbin winder, and try again. If the thread keeps breaking, the tension disc may be dirty — use a small brush or compressed air to clean it gently. Lint and dust can catch the thread and cause it to snap.

If the bobbin does not wind evenly or stops before it is full, the bobbin may not be seated firmly on the spindle. Remove it, push it on again until you hear the click, and restart. If the machine still stops early, the bobbin itself may be damaged or warped — try a different blank bobbin. Bobbins can crack or bend if they fall or are stored improperly.

If you see loops or loose stitches on the underside of your fabric after sewing, the bobbin thread tension may be wrong. This usually means the thread was not seated under the tension spring correctly. Remove the bobbin case, rethread the bobbin thread under the spring, and try sewing again on a scrap of fabric first to test the fix.

If the bobbin thread tangles or jams inside the case, the thread tail may have been too long, or the bobbin may not be seated flat. Remove the bobbin, trim the tail to 2 to 3 inches, and reseat it firmly in the case. Tangled thread often means you need to start over with a fresh bobbin.

When to call a repair technician

If you have followed these steps and the machine still will not wind a bobbin, or if the bobbin winder spindle does not move or click into place, the winder mechanism may need service. A Brother repair technician can diagnose and fix mechanical problems that are beyond basic troubleshooting.

If the tension disc is cracked, the bobbin case is bent, or the spindle is damaged, these parts can be replaced — contact a local sewing machine repair shop or Brother customer service for parts and repair options. Trying to force a damaged part can cause more harm to the machine.

Frequently Asked Questions

Can I use any bobbin in my Brother machine?

No. Brother machines use specific bobbin sizes and styles. Most home Brother machines use Class 15 bobbins, but some models use Class A or other sizes. Check your manual or the Brother website for your exact model. Using the wrong bobbin can cause tension problems or jamming. You can order replacement bobbins directly from Brother or buy them from fabric and sewing supply stores.

What if my bobbin case is not removable?

Some Brother models have a drop-in bobbin system where the bobbin sits in a fixed case under the needle plate. You do not remove the case itself — you straightforward open the cover, drop the bobbin in, and close it. The steps for threading the bobbin under the tension spring are the same. Your manual will show you whether your machine has a removable or drop-in case.

How tight should the bobbin thread be under the tension spring?

The thread should sit snugly under the spring so it does not slip out, but you should still be able to pull it gently. If you pull and the thread moves freely with no resistance, it is not seated correctly. If you cannot pull it at all, it may be pinched. Reseat the thread so it runs smoothly under the spring.

Why does my bobbin keep running out of thread?

If the bobbin empties faster than expected, you may be sewing with very long stitches or using thick thread that consumes more bobbin thread per stitch. Wind a fresh bobbin and keep a spare wound and ready. Some sewers wind two or three bobbins before starting a project so they do not run out mid-seam.

Can I wind a bobbin while the presser foot is down?

No. The presser foot must be up before you wind a bobbin. When the presser foot is down, the tension discs are engaged, which will prevent the bobbin from winding correctly or may damage the thread. Always raise the presser foot before you start winding.