Guide: How Do You Thread A Bobbin On A Sewing Machine

Learning to thread a bobbin on a sewing machine is a basic step. It lets your machine make stitches. The bobbin holds the bottom thread. The top thread comes from the spool. Both threads must meet to make a good stitch. How do you do it? You first wind thread onto the bobbin. Then, you put the bobbin into the machine. The way you put it in depends on your machine type. This guide will show you the steps.

Why Bobbins Are Important

Every sewing machine uses two threads. One thread comes from the top spool. The other comes from the bobbin below. These two threads lock together in the fabric. They make a stitch. Without a bobbin, you cannot sew. The bobbin must have thread on it. The thread must be the right kind. It must also go into the machine the right way.

What Kind of Bobbin Do You Need?

Sewing machines use different kinds of bobbins. It is very important to use the right one for your machine. Using the wrong bobbin can cause big problems. It can make stitches uneven. It can even damage your machine. Check your sewing machine manual. It will tell you the right bobbin type.

H5 Common Bobbin Types

Class 15 Bobbins: These are very common. Many home sewing machines use them. They are usually clear plastic or metal. They are flat on the top and bottom.
Class 66 Bobbins: These bobbins are also popular. Some older machines use them. They are usually clear plastic or metal. They have a slight dome shape on the top and bottom.
L-Style Bobbins: These are smaller than Class 15 or 66. Some embroidery machines and portable machines use them. They can be plastic or metal.
M-Style Bobbins: These are larger. Industrial machines often use them. Some newer home machines for quilting might use them. They hold more thread.

Always use the bobbin made for your machine model. They might look the same but be a little different. That small difference matters for how the machine works.

The Two Main Bobbin Systems

Sewing machines have two main ways to hold the bobbin. This affects how you put the bobbin in.

H5 Front-Loading Bobbin System

Some machines have a bobbin holder that opens at the front. This is often under the sewing area. You usually need a bobbin case for this type. You put the bobbin inside the bobbin case. Then you put the case into the machine. Older machines and many heavy-duty machines use this type.

H5 Top-Loading Bobbin System

Other machines have a door on top of the sewing area. This is usually right in front of the needle plate. These are often called drop-in bobbin loading systems. You simply drop the bobbin into a spot. You do not need a separate bobbin case. Many modern machines use this type. This system is often easier to use. It also lets you see how much thread is left on the bobbin.

Knowing your machine’s system is the first step. It tells you which way to thread the bobbin.

Winding Thread Onto a Bobbin

Before you can put the bobbin in, you need thread on it. This is called sewing machine bobbin winding. Almost all sewing machines have a built-in bobbin winder. This makes putting thread onto the bobbin easy.

H4 Getting Ready to Wind

Find the Bobbin Winder: Look on the top or front of your machine. You will see a small pin sticking up. This is the bobbin winder spindle. There is also usually a small metal disc or guide near it. This is for the thread.
Place the Spool: Put your spool of thread on the spool pin. Make sure it turns smoothly. The thread should come off the spool correctly. For some spools, thread comes off the side. For others, it comes off the top. Your machine manual shows the right way.
Get Your Empty Bobbin: Take an empty bobbin that fits your machine.
Prepare the Thread: Take the thread end from your spool.

H4 The Steps for Winding Thread Onto Bobbin

This is the main process for winding thread onto bobbin.

Follow the Path: Your machine has a special path for winding bobbins. It is part of the overall sewing machine thread path. Look for numbers or pictures on your machine. The thread usually goes from the spool pin to a guide. Then it goes to a tension disc specifically for winding bobbins. This disc helps wind the thread smoothly and evenly.
- Tip: Some machines have a thread guide just for winding. It might look like a hook or a loop.
- Tip: The tension disc for winding is important. It keeps the thread tight as it winds. This helps the thread go on the bobbin neatly.
Put Thread on Bobbin: Take the thread end. Put it through one of the small holes on the bobbin. Some bobbins have a few holes. Pick any one. Pull about 3-4 inches of thread through the hole.
Place Bobbin on Spindle: Put the bobbin onto the bobbin winder spindle. Push it down firmly.
Lock the Winder: Slide the bobbin winder spindle over. You will feel it click or lock into a winding position. This engages the bobbin winder mechanism. On some machines, this action disengages the needle. The needle should not move while you wind the bobbin. If your needle moves, check your manual. There might be a switch or knob to stop it.
Hold the Thread Tail: Hold onto the short thread tail coming out of the top of the bobbin. Hold it lightly for the first few turns.
Start Winding: Gently press the foot pedal. Or press the start button if your machine has one. The bobbin will start to spin. The thread will wind around it. Let the bobbin wind a few times.
Stop and Trim: After the bobbin has a few turns of thread, stop the machine. Cut off the short thread tail that you were holding. Cut it close to the bobbin.
Continue Winding: Start winding again. The machine will keep winding thread onto the bobbin. It should wind evenly from side to side. The bobbin winder mechanism helps the thread layer smoothly.
Stop Winding: Most machines stop winding on their own. When the bobbin is full, it will reach a certain size. The winder mechanism will stop the bobbin from spinning. If your machine does not stop by itself, watch the bobbin. Stop winding when it is full. Do not overfill it. Overfilling can cause thread jams in the machine.
Cut the Thread: Cut the thread connecting the bobbin to the spool.
Remove the Bobbin: Slide the bobbin winder spindle back to its resting position. Take the full bobbin off the spindle.

You now have a full bobbin. It is ready to be placed into the sewing machine. The process of winding thread onto bobbin is now complete.

H4 Tips for Good Bobbin Winding

Wind at a medium speed. Going too fast can cause uneven winding or thread breaking.
Make sure the thread goes through the winding tension disc. This keeps the thread tight as it winds. If the thread is loose while winding, it will be loose on the bobbin. This can cause bobbin thread tension problems later.
Do not wind the bobbin too full. The thread should stay within the edges of the bobbin.
Wind enough thread for your project. It is better to have a full bobbin than to run out of thread mid-seam.
If the thread winds unevenly, check the thread path. Make sure it is going through all the guides and the tension disc.

Placing the Bobbin in the Sewing Machine

Now that the bobbin is full, you need to place bobbin in sewing machine. This is where the two main types of systems differ.

H3 Putting Bobbin in a Front-Loading Machine (With a Bobbin Case)

This system requires an extra step: using a bobbin case. You must insert bobbin case into the machine.

H4 Preparing the Bobbin Case

Get the Bobbin Case: Find the metal bobbin case for your machine.
Insert the Bobbin: Take your full bobbin. Look at how the thread comes off the bobbin. For most front-loading machines, the thread should come off the side of the bobbin. It should form a letter ‘P’ shape or face to the left when you put it in the case. Your manual will show the correct direction. This is very important.
Pull Thread Through Slot: There is a slot on the side of the bobbin case. Slide the thread into this slot.
Pull Thread Under Tension Spring: After the slot, there is a tension spring on the bobbin case. This is a small metal piece. Pull the thread under this spring. You will feel a slight resistance. This resistance creates the bobbin thread tension needed for stitching. Pull the thread until it is under the spring and comes out of the little opening at the end of the spring.
Leave a Tail: Leave a thread tail of about 4-6 inches hanging from the bobbin case.

H4 Inserting the Bobbin Case

Open the Bobbin Area: Open the door or remove the cover that hides the bobbin area. This is usually on the front of the machine, under the needle plate.
Hold the Bobbin Case: Hold the bobbin case by the little latch or handle on its side. The thread tail should be hanging freely.
Put Case into Machine: Insert the bobbin case into the round opening in the machine. There is a small stationary finger or notch inside the machine that the bobbin case needs to hook onto. This keeps the case from spinning. Line up the bobbin case so its notch fits onto the machine’s finger.
Click it In: Push the bobbin case firmly until it clicks into place. The latch on the case might snap shut.
Close the Door: Close the bobbin area door or replace the cover.

H4 Bringing Up the Bobbin Thread

After you insert bobbin case, you need to bring the bobbin thread up. It needs to meet the top thread.

Hold the Top Thread: Make sure the top thread is threaded through the needle. Hold the end of the top thread lightly with your left hand.
Turn the Handwheel: Use your right hand to turn the handwheel on the side of your machine. Always turn the handwheel towards you. Turning it the other way can cause problems.
Lower and Raise Needle: Turn the handwheel until the needle goes down into the needle plate hole. It goes all the way down. Then keep turning the handwheel towards you. The needle will come back up.
Catch the Loop: As the needle comes up, its thread will catch the bobbin thread. It will pull a loop of the bobbin thread up through the needle plate hole. Watch for this loop.
Pull the Bobbin Thread: Use your fingers or tweezers to pull the loop of bobbin thread up through the hole.
Pull Both Threads: Pull the bobbin thread end and the top thread end. Pull about 4-6 inches of each thread out.
Place Threads Under Foot: Slide both thread tails back and under the presser foot. Place them towards the back of the machine.

Your front-loading machine is now threaded and ready to sew.

Placing Bobbin in a Top-Loading Machine (Drop-In Bobbin)

This system is often quicker because there is no separate bobbin case. It uses drop-in bobbin loading.

H4 Steps for Drop-In Bobbin Loading

Open the Cover: The bobbin area is under a clear plastic cover on the needle plate. Slide or lift this cover to open it.
Prepare the Bobbin: Take your full bobbin. Look at the bobbin well (the round spot where the bobbin sits). There is usually a diagram showing which way the thread should spin. For most top-loading machines with horizontal bobbin placement, the thread should come off the bobbin counter-clockwise. This means if you put the bobbin in the well, the thread comes off the left side. This is very important for correct bobbin thread tension.
Drop in the Bobbin: Place the bobbin into the bobbin well. Make sure it sits flat. The thread must be coming off in the correct direction (usually counter-clockwise). This is the horizontal bobbin placement.
Follow the Thread Path: There is a marked thread path around the bobbin well. This path guides the thread to the tension mechanism for this type of bobbin. Slide the thread into the first notch or guide on the edge of the well.
Continue Along Path: Pull the thread along the path. It usually goes into another notch or under a small metal piece. This second point is where the bobbin thread tension is set for a drop-in bobbin. Pull the thread until it is through all the guides on the path. Leave a thread tail of about 4-6 inches coming out towards the back of the machine.
Leave Thread in Place: For most top-loading machines, you do not need to bring the bobbin thread up manually like with a front-loader. The machine does it for you when you start sewing. Just leave the thread tail resting there, usually extending back under the presser foot area.
Close the Cover: Slide or snap the clear cover back into place over the bobbin well.

Your top loading bobbin machine is now threaded and ready to sew.

The Role of Bobbin Thread Tension

We talked about bobbin thread tension briefly. Why is it so important? Bobbin thread tension controls how much pull is on the bottom thread. The machine works because the top thread and the bottom thread pull against each other with equal force.

Too Much Bobbin Tension: If the bobbin thread is too tight, it pulls the top thread down. You will see loops of the top thread on the underside of your fabric.
Too Little Bobbin Tension: If the bobbin thread is too loose, the top thread pulls it up. You will see loops of the bobbin thread on the top side of your fabric.
Correct Tension: When the tension is correct, the two threads meet exactly in the middle of the fabric layers. The stitches look the same on both sides of the fabric.

H4 Adjusting Bobbin Thread Tension

Front-Loading (Bobbin Case): The tension is adjusted on the bobbin case itself. There is a small screw on the tension spring. Turning this screw changes the tension. Turning it clockwise makes the tension tighter. Turning it counter-clockwise makes it looser. Be very careful. This screw is small. Small turns make big differences. It is best to avoid adjusting this screw unless you are sure it is the problem. And mark the original position of the screw before you adjust it.
Top-Loading (Drop-In): The tension for these bobbins is usually set inside the machine. It is not typically adjustable by the user. If you have tension problems with a drop-in bobbin, the issue is more likely:
- Incorrect bobbin winding.
- Incorrect threading of the top thread.
- Lint or thread bits caught in the bobbin area tension path.
- Using the wrong type of bobbin.

If you have tension problems, first check your threading (top and bottom). Clean the machine. Make sure you are using the right bobbin. Only adjust the bobbin case screw as a last resort, if you have a front-loading machine.

Troubleshooting Bobbin Problems

Sometimes things go wrong with the bobbin. Here are common issues and how to fix them.

H4 Stitches Look Bad

Problem: Loops on the top of the fabric.
- Cause: Bobbin thread is too loose OR top thread is too tight.
- Fix: Check bobbin threading first. Is the thread in the tension path/spring correctly? For drop-in, is the thread coming off the bobbin the right way? If threading is correct, check top thread tension (make it looser) or bobbin tension (make it tighter, if adjustable).
Problem: Loops on the bottom of the fabric.
- Cause: Bobbin thread is too tight OR top thread is too loose.
- Fix: Check top thread threading first. Is it through all guides and the tension discs correctly? Is the presser foot down? If top threading is good, check bobbin tension (make it looser, if adjustable) or top tension (make it tighter).

H4 Thread Jams (Bird’s Nests)

Problem: A big mess of tangled thread, usually under the fabric.
- Cause: Most often, the top thread is not threaded correctly or the presser foot was not down. This causes the top thread to have no tension. The bobbin thread pulls it into a mess. Can also be incorrect bobbin placement or winding.
- Fix:
  1. Lift the presser foot.
  2. Carefully cut the tangled threads and remove your fabric.
  3. Remove the bobbin. Clean out any tangled thread bits from the bobbin area.
  4. Fully unthread the entire machine (top and bobbin).
  5. Re-thread the top thread with the presser foot UP. Then put the presser foot DOWN before starting to sew.
  6. Re-insert the bobbin correctly, making sure the thread is in its tension path.
  7. Pull both threads under the foot to the back.
  8. Test on a scrap piece of fabric.

H4 Bobbin Winding Problems

Problem: Thread winds unevenly (more on one side).
- Cause: Thread not going through the winding tension guide/disc. Winding too fast.
- Fix: Unthread the bobbin winder. Re-thread, making sure the thread is properly seated in the tension disc and guides. Wind slower.
Problem: Thread breaks while winding.
- Cause: Winding too fast. Thread snagging on the spool or machine. Using old or poor quality thread. Bobbin winder tension is too high.
- Fix: Wind slower. Check thread path. Try a new spool of thread.

H4 Bobbin Won’t Spin

Problem: Bobbin doesn’t spin when you press the pedal during winding.
- Cause: Bobbin winder spindle not pushed into winding position. Needle engaged (machine is trying to sew instead of wind).
- Fix: Make sure the winder spindle is pushed over fully. Check if you need to push in the handwheel or flip a switch to disengage the needle for winding.

H4 Bobbin Runs Out Too Fast

Cause: Using small bobbins. Winding bobbin loosely (not enough thread fits). Sewing long seams without checking thread amount.
Fix: Use the largest correct bobbin for your machine. Make sure thread is winding on the bobbin smoothly and firmly (via the tension disc). Check your bobbin often during long projects, especially with a drop-in bobbin where you can see it.

Maintaining Your Bobbin Area

Keeping the bobbin area clean is very important. Lint and small bits of thread build up here. This can mess up bobbin thread tension. It can cause thread jams and skipped stitches.

H4 Steps for Cleaning

Turn Off Machine: Always turn off your machine before cleaning or removing parts. Unplug it to be extra safe.
Remove Bobbin: Take out the bobbin and the bobbin case (if your machine has one).
Remove Plate: Remove the needle plate. You might need a small screwdriver for this.
Clean: Use a small brush (your machine might have come with one) to gently brush away lint and dust. Pay close attention to the bobbin well, the tension spring on the bobbin case (if used), and the area where the bobbin sits or spins. Do NOT use canned air. It can push lint further into the machine.
Oil (If Needed): Some machines need oiling in the bobbin area. Check your manual. Only use sewing machine oil. Do not use other oils. Put just one small drop in the spots your manual shows. Many newer machines are “self-lubricating” and do not need oiling.
Put Back Together: Replace the needle plate. Put the bobbin (and case) back in correctly.

Clean your machine regularly. How often depends on how much you sew. If you sew a lot or use fuzzy threads, clean it more often.

Getting to Know Your Sewing Machine Thread Path

Both winding a bobbin and threading the top thread use a specific sewing machine thread path. Machines have guides, hooks, and tension discs. These parts direct the thread. They also control the thread tension.

H4 Why the Path Matters

Proper Tension: The thread must go through the tension discs. This creates the pull needed for balanced stitches. If you miss a guide or the thread pops out, the tension is lost.
Smooth Feeding: The guides keep the thread from tangling. They help it move smoothly from the spool to the needle or bobbin.
Correct Stitching: Following the path correctly is key to making stitches. If any part of the path is missed, the stitch will not form right.

Your manual has a diagram of the thread path. It often has numbers showing the order. Always follow this path exactly for both winding and threading the top.

Conclusion

Learning how to thread a bobbin on a sewing machine is a basic skill. It is needed for all sewing projects. First, you wind thread onto the bobbin using the bobbin winder. This involves following a specific sewing machine thread path and using the bobbin winder tension. Then, you place bobbin in sewing machine. This process depends on whether you have a front-loading machine that needs you to insert bobbin case or a top-loading machine with drop-in bobbin loading and horizontal bobbin placement. Proper bobbin thread tension is important for nice stitches. Keeping the bobbin area clean prevents many problems. Practice these steps. Soon, winding and threading your bobbin will be quick and easy. This lets you focus on the fun part: sewing!

Frequently Asked Questions (FAQ)

H5 How much thread should I wind onto a bobbin?

Wind until the bobbin is full. Most machines stop winding when the bobbin reaches its limit. Do not wind past the edges of the bobbin. An overfilled bobbin can cause issues. It is better to have a full bobbin than to run out mid-seam.

H5 Can I use thread of a different color on the bobbin than the top thread?

Yes, you can. This is common. The bobbin thread color will show on the bottom of your fabric. The top thread color will show on the top. For normal seams, many people match the top and bobbin thread colors. For special effects, you might use different colors. Sometimes, for hidden seams, you match the bobbin thread to the underside of the fabric and the top thread to the top.

H5 What if my bobbin case falls out or seems loose in a front-loading machine?

The bobbin case should click firmly into place. There is a small metal finger or hook inside the machine that the case hooks onto. Make sure the case is lined up correctly with this finger and pushed in until it clicks. If it still seems loose, check if the machine’s finger is bent or damaged. You might need a service technician to look at it.

H5 My drop-in bobbin thread keeps coming out of the tension path. Why?

This can happen if you did not pull the thread firmly into the guides. Make sure the thread clicks or slides fully into each notch or guide along the path around the bobbin well. Also, check if the bobbin is spinning in the correct direction (usually counter-clockwise for drop-in). If the direction is wrong, the thread will not stay in the tension path correctly.

H5 Do I need to oil my bobbin area?

It depends on your machine. Some machines need a drop of oil in the bobbin area regularly. Others are made not to need oiling by the user. Check your sewing machine manual. It will tell you if and where to oil. Use only special sewing machine oil.

H5 How do I know if I’m using the correct bobbin type?

Check your sewing machine manual. It lists the correct bobbin type or class for your machine. Using the wrong size or shape bobbin can cause serious problems, including thread jams and damage. Bobbins that look similar might be slightly different. Always use the type recommended by the machine maker.

H5 Why does my sewing machine bobbin winding sometimes feel very tight?

The thread might be wrapped around the spool pin or catching on something. Check the thread path from the spool to the winder. Make sure it is going through the winding tension disc correctly. If the tension disc for winding is dirty or damaged, it can also cause issues.

H5 Can I wind a bobbin using thread from another bobbin?

Yes, you can. This is often called “re-winding” a bobbin. You can put a partially full bobbin on the spool pin (if it fits) or on a special bobbin stand. Then thread it through the winder path and wind it onto an empty bobbin. Make sure the thread comes off the original bobbin smoothly.

H5 Why is my bobbin thread tension suddenly wrong when it was fine before?

This is often caused by lint or a small piece of broken thread stuck in the bobbin tension area. For a bobbin case, check the tension spring for debris. For a drop-in bobbin, clean the thread path around the bobbin well. Incorrect top threading is also a very common cause of stitch problems that look like bobbin tension issues. Always re-thread the top and bottom first after cleaning.