How to thread a sewing machine (top thread and bobbin)

Threading is the first wall every new sewist hits, and it’s responsible for more abandoned machines than any other single thing. A wrongly-threaded machine doesn’t just refuse to sew. It makes a horrible nest of thread under the fabric, snaps the top thread, and generally convinces you the machine is broken when it’s working perfectly. It isn’t broken. It’s threaded wrong.

The good news: every machine threads in the same logical order, even if the exact path varies. Once you understand why the thread goes where it goes, you can thread any machine you sit down at. This guide does the upper thread and the bobbin, in the order you’d actually do them.

Step 1: Wind the bobbin

The bobbin is the small spool that sits underneath, providing the bottom thread. Most machines wind it on top using the motor:

1. Put your main thread spool on the spool pin at the top of the machine.
2. Take the thread across to the bobbin-winding tension disc (a small metal disc near the bobbin winder), following the guide marks printed on the machine.
3. Wind the thread a few times around an empty bobbin by hand, pop the bobbin on the winder pin, and push it to the right to engage.
4. Hold the loose thread tail, press the foot pedal, and let it wind. Cut the tail once a few turns have built up, then fill the bobbin until it stops or looks evenly full.

An unevenly wound bobbin, thread piling up at one end, usually means the thread skipped the winding tension disc. Re-route it and try again. A good bobbin should look like a tidy, level reel.

Step 2: Insert the bobbin

There are two common types. Drop-in (top-loading) bobbins sit in a clear case under a flap on the bed of the machine, drop it in so the thread comes off in the direction the diagram shows (usually anticlockwise), pull the thread through the slot, and close the cover. Front-loading bobbins go into a removable metal case first, with the thread pulled through the case’s tension slot, then the whole case clicks into the machine.

The single most common bobbin mistake is dropping it in spinning the wrong way. If your stitches look wrong no matter what you do with the top tension, take the bobbin out and flip its direction. On most drop-in machines, the thread should form a backwards “P” shape as it comes off.

Step 3: Thread the upper thread

This is the part that matters most, and the rule that fixes almost everything is this: raise the presser foot before you thread the top. The presser foot lever controls the tension discs inside the machine. Foot up = discs open, so the thread slips down between them. Foot down = discs closed, so the thread sits on top of them and the tension is wrong. Thread with the foot up, every time.

Most machines have the threading path printed on them with little numbered arrows. The universal order is:

1. From the spool, take the thread to the left and into the top thread guide.
2. Down the right-hand channel, around the bottom, and back up the left-hand channel (this U-shape is where the thread passes through the tension discs).
3. Up to the take-up lever at the top and through its eye (it looks like a hook that moves up and down, make sure the thread is hooked through it, or you’ll get a tangled mess).
4. Back down to the needle, through any lower guides, and finally through the eye of the needle, front to back.

Raising the needle to its highest position first (turn the handwheel towards you) makes the take-up lever accessible and the whole path easier to follow.

Step 4: Using the automatic needle threader

If your machine has a needle threader (a small lever on the left of the needle bar), it saves your eyesight. Lower the needle to its highest point, push the lever down, and a tiny hook swings through the needle’s eye. Loop your thread around the hook, let the lever go, and it pulls a loop of thread back through the eye. It feels fiddly the first three times and effortless after that. If it won’t catch, the needle is probably not raised fully or is slightly bent.

Step 5: Pull up the bobbin thread

With both threads in place, you bring the bobbin thread up so both can be drawn to the back:

1. Hold the end of the upper thread loosely in your left hand.
2. Turn the handwheel towards you one full turn, so the needle goes down and comes back up.
3. The upper thread will catch the bobbin thread and bring up a loop. Tug the loop to pull the bobbin tail all the way up.
4. Lay both thread tails towards the back of the machine, under the presser foot. About 10cm of each is plenty.

Starting to sew without doing this is the classic cause of the “bird’s nest” of thread jamming under the fabric on your first stitch.

When something still goes wrong

• Thread nests under the fabric: almost always the upper thread, not the bobbin. Rethread the top with the presser foot up.
• Top thread keeps breaking: check it’s seated in the tension discs and hooked through the take-up lever; check the needle isn’t in backwards.
• Loops on the underside: the upper thread missed the tension discs. Rethread.
• Loops on the top: the bobbin thread isn’t seated in its tension slot. Re-seat the bobbin.

Notice how many problems come back to “rethread it properly.” When in doubt, take both threads out completely and start clean. It’s faster than hunting for the one wrong loop.

It becomes muscle memory

Threading feels like a memory test for the first week and becomes muscle memory by the second. Learn the order, bobbin wind, bobbin in, upper thread with the foot up, take-up lever, needle, pull up the bobbin thread, and you’ll thread any machine without the manual. Get this right and most “my machine is broken” panics simply disappear.