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Bobbin Thread Keeps Breaking

There are a number of common reasons for the bobbin thread in your sewing machine to break. Resolving these issues will make sewing easier. This is a guide about fixing bobbin thread that keeps breaking.


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By 0 found this helpful
November 7, 2015

I have a Bernina machine which is sewing OK with the normal foot. I have attached the walking foot to quilt with and now the thread keeps breaking in the the bobbin case and the sewing is all bunched on the back. I have cleaned the machine, adjusted the tension, put a new needle in, rewound the bobbin in a new bobbin, and prayed to the sewing machine fairy. Any other suggestions?


November 10, 20150 found this helpful
Best Answer

When you write that you've adjusted the tension, have you tightened the tension, or loosened it? To use a walking foot you want to LOOSEN, same as you would for stretch and or zig-zag sewing.

Regular servicing is important - the reason Mpscarlet's Bernina came back from servicing with the thread breaking issue resolved is that the tech cleaned accumulated thread lint and fuzz out of the tension discs. All machines have tension discs either on a dial on the outside of the machine, or inside.


Regular servicing means those discs (among other routine checks/servicing) are cleaned and inspected.

The only other reasons your bobbin thread would be breaking whilst the walking foot is employed would be either incorrect install of the foot (surprisingly easy, changing the setting on the feed dogs makes a difference re installing a foot) or the bobbin case tension needs adjusting. Your manual (available as a free download from the Bernina site if your's has gone missing) will show you how to adjust it safely.

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By 0 found this helpful
August 14, 2018

What makes the bottom spool on my Jones sewing machine keep breaking? It's just driving me mad as I've tried everything to rectify it.



August 14, 20180 found this helpful

Make sure the bobbin is not inserted backwards

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August 16, 20180 found this helpful

your tension is too tight or the thread is old

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August 17, 20180 found this helpful

I do not know what you have tried but maybe this will help:
From one website:

"The upper thread tension could be set too tight. Set the tension to the best thread tension setting or less. Make sure the spool of thread is installed correctly using the correct size spool cap for the size of spool. ... Check that the bobbin is wound so that it about 80% full and that the thread is evenly wound.


Be sure thread is not old or twisted."

Here is a link to the company if you still have problems:

You may find some useful information on this popular site:

Here is a link to service manuals:

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August 21, 20180 found this helpful

If you don't have a solution yet, try asking the company. Their info is

Good wishes for an easy solution!!

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April 13, 20150 found this helpful

My sewing machine thread keeps breaking after a couple of seconds. It is not the bobbin thread. Am I threading it wrong?

By Alice


April 19, 20150 found this helpful

Could be the tension is off on either top thread or bottom thread OR if your sewing machine is vintage; it's likely you need to use cotton thread instead of the newer popularly used thread as it tends to stretch whereas cotton does not. I own my grandmother's electric sewing machine and found the problem to be thread type and had to buy cotton for it to work properly.

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