How to solve and avoid the problem of thread bunching when sewing
In my many years of working as a sewing instructor, I have found that thread bunching when sewing is a topic that concerns sewers around the world. Newcomers in particular are often affected and look for a solution.
At the moment, people are sewing more than ever before. As well as experienced sewers who are using the time at home to engage in their beloved hobby and who are familiar with and have mastered their machine, there are also many people who are using a sewing machine for the first time. In a series of posts, I want to show you how to avoid common mistakes and achieve successful results. In my first blog post, which you can find here, I wrote about the machine “eating up the material” when you start sewing. This article looks at thread bunching when sewing.
What should I do if “thread bunching” occurs when I start sewing? How can I make sure it doesn’t happen in the first place? I will answer these questions. I will also explain what to do if the gears message appears on the screen and the machine is blocked.
The post is aimed mainly at beginners. Hopefully it also contains some helpful tips for experienced sewing enthusiasts as well.
What should I do if I experience thread bunching?
As “thread bunching” occurs on the underside of the fabric, some people think it is due to the lower thread. They check whether the bobbin is sitting correctly in the bobbin case or even replace the bobbin. This does not usually change the situation. This is because the cause is not usually the lower thread, but the upper thread!
Of course, I assume that the upper thread tension is set correctly. On many models, the upper thread tension is set automatically. However, if you have previously set the tension for special sewing tasks or threads, you should reset it to the default setting. In addition, the correct ratio of upper and lower sewing thread to the needle is important.
Below are some tips that will hopefully help you solve the problem of thread bunching or avoid it altogether. You will find that some tips are the same as in my last blog post on the topic of preventing the machine from “eating the material” when you start sewing. The two topics are closely related to each other.
Tip 1: Is the upper thread threaded correctly?
I showed how to thread the machine correctly in a video in my first post. When threading the upper thread, it is important to raise the presser foot and hold the thread lightly with your right hand while you pass it through the guides along the marked thread path with your left hand.
Check that the upper thread has been threaded correctly in the pretensioner on the top rear of the machine and is not just lying on top of it.
Also make sure the thread is positioned properly between the tension discs on the top of the machine:
If it is not positioned correctly, it will not have any tension, and will be pulled under with the very first stitch.
In addition, check whether the upper thread is in the thread take-up lever. The take-up lever is the part that moves up and down on the front of the machine:
There is also a whole video on the topic of thread tension that you can watch:
Tip 2: Is the presser foot down?
It may sound banal, but particularly when you sew thick fabrics or several layers, you might forget to lower the presser foot. This of course means that there is no tension on the upper thread. The upper thread is pulled under, resulting in thread bunching.
Tip 3: Has the upper thread got caught?
The upper thread may have got caught somewhere. This can happen, for example, if you leave a gap between the foam pad, thread spool and spool disc. Here, you can see how to insert the upper thread correctly using the BERNINA 4 Series as an example:
This is wrong:
This is right:
You may also be using the vertical spool holder and have forgotten to put the foam disc underneath. Then the upper thread breaks and you may forget to raise the presser foot when rethreading it so that the upper thread is positioned in the tension disc again.
This is wrong…
…and this is what it looks like when you have put the disc under the spool correctly:
Tip 4: Keep your knees away from the knee lever!
I have also seen sewers touch the knee lifter slightly with their knee while sewing because they were sitting too close to it. If you keep accidentally exerting slight pressure on the knee lever, the presser foot will be raised slightly, causing the upper thread tension to become uneven. So when sewing, and of course when embroidering, keep your knees away from the knee lever!
Tip 5: Possibly switch off the securing stitches (for certain fabrics)
When delivered, BERNINA machines are set so that they make securing stitches when you start sewing. This means that if you press the thread cutter button and then start sewing again, the machine automatically makes four securing stitches on the spot. In the case of thin fabrics, this can lead to the fabric and the upper thread being pulled down right at the edge when you start sewing, causing a jumble of tangled thread.
However, it is possible to switch off the securing stitches in the setup on our newer sewing machines, starting from the 4 Series. To do this, select Setup program, go to Sewing settings, then Program buttons and icons, then Thread cutter. There, you can switch off the securing stitches.
This is what it looks like when they are activated (based on the example of the BERNINA 790 PLUS):
And this is what it looks like after you have turned off the securing stitches:
Again, there is a video showing how to do this (using the BERNINA 5 Series as an example):
Tip 6 (for owners of an 8 Series machine): when threading manually, pay attention to the sequence
If you own a machine from the BERNINA 8 Series, you usually thread the needle fully automatically. However, you may want to thread it manually – for example, if you use a double needle or thicker thread. To do this, you first have to press the “Manual threading” icon on the display. Then press the “Automatic threader” button and thread into the needle manually.
In the tutorial on the 8 Series you can find an animation under the heading “Threading the thread”, “Threading a double needle”.
Occasionally, when I am threading an 8 Series machine, I do the threading a little too quickly. So an additional tip for everyone starting for the first time with an 8 Series: you can remove the left cover of the machine using the multi-function tool supplied to see whether the upper thread is really in the thread take-up lever. Old hands probably won’t need to do that.
What should I do if the machine is blocked?
What should you do if the thread is pulled down inside, the machine is blocked and the gears message appears on the screen?
Here are some tips for you:
- Never pull on the fabric or the threads! Pulling could cause sensitive parts, such as the thread cutter, to be damaged.
- If possible, first remove the presser foot and the needle.
- Then use scissors to carefully cut the threads or the fabric above the stitch plate.
- Open the hook area and remove the bobbin case.
- Check whether there are any tangled threads in the hook area. To do this, take out the hook.
- Carefully try to release the blockage by turning the handwheel forward.
- Remove the stitch plate and check whether there are tangled threads under the stitch plate; if so, remove them.
- Replace the hook, bobbin case, bobbin and stitch plate.
- Check if the upper thread has been threaded correctly. If necessary, thread the upper thread again.
You can see how to remove and clean the BERNINA hook on 4, 5 and 7 Series machines in this video:
This brings us to the end of my second post with tips for starting to sew successfully. As mentioned at the start, thread bunching when sewing is unfortunately a problem that many beginners have to deal with. Hopefully, you now know how to solve this problem and make sure it no longer happens. I will keep my fingers crossed that you won’t need any more tips from me about this in the future and I wish you many hours of undisturbed sewing enjoyment.