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Why Is My Bobbin Thread Bunching Up

Everything you need to know before calling a sewing machine repairman! This article provides a list of possible reasons for why sewing machine thread bunches up and solutions on how to fix it.

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What Causes Sewing Machine Thread to Bunch Up?

Before I go over all the things you can check to fix this annoying problem, let’s first make sure you understand what’s causing the problem.

The short and dirty answer is tension.

Tension seems to be the culprit in the majority of cases. However, this isn’t always the case, so there are other things you can check as well.

Let’s go over tension so you can understand why this can be such a big issue.

Tension is what keeps the top and bottom stitches in perfect balance with one another.

In other words, it’s what keeps the front and back stitches looking the same.

When sewing, the top, and bottom stitches should interlock smoothly and look the same.

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However, if the stitches are puckered, the seam is unstable, the thread bunches up, or the stitches are just plain ugly, then there is most likely a problem with incorrect tension on either the top or bottom.

It is important that both the top and bottom tension work together to create proper stitches.

For a better understanding of sewing machine tension, I recommend reading the following articles:

Understanding Thread Tension In Your Sewing Machine

Sewing Lesson 10: How to Fix Tension on Your Sewing Machine

Things to Check When Your Sewing Machine Thread Bunches Up.

When your sewing machine thread bunches up you may also experience thread jamming.

In other words, you may have large tangles and huge clumps of bunched up thread not only on your fabric but inside your sewing machine as well.

This typically occurs in the bobbin area and it can be terrifying to witness!

I have had tangles and bunches of thread in the bobbin area so bad that my machine literally became locked up and I couldn’t even pull the fabric out!

When this happens to you, you will want to cry. Well, at least I did.

You may even panic and schedule an appointment with a repairman.

Fortunately, I left my phone on the hook the first time this happened to me and consulted the great and powerful Google instead.

After lots of research, I was able to successfully fix the issue.

I then wrote down all the tips I learned and decided to share them in this post.

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Believe it or not, every time my thread bunches up I consult this checklist. And, if I learn something new, I add it to this post.

So, these are all the things, in my experience, that you can check before making a 911 call to your sewing machine mechanic.

Note: In order to go through this checklist, you should be familiar with your sewing machine and the basic sewing process. If you are new to sewing and/or recently purchased a new sewing machine, make sure you understand all the parts of a sewing machine.

Also please check out the sewing resources page for more information.

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