Troubleshooting Sewing Machine Tension Problems

Troubleshooting Thread Tension Sewing Machines

If you have thread sewing machine tension problems here you find tips how to fix many of them. All tips and tricks are from professional sewing machine technician.

Troubleshooting Thread Tension Sewing Machines, step 1

There are three types of the shuttle mechanism that are used in domestic sewing machines. The most of modern sewing machines have shuttle hook system with top loading bobbin.
This built-in bobbin case works quietly and gently. But this device has some problems that will be discussed below.

Troubleshooting Thread Tension Sewing Machines, step 2

Vertical oscillating shuttle hook system is the second popular type. The vertical oscillating shuttle has bottom loading bobbin case with the bobbin inside. In this post you learn how it works more details.
If is problem with thread it is necessary to check the surface of the shuttle parts at first. Be sure the metal surface of bobbin case and other detail are in perfect condition or during sewing fabrics problems can occur.

Troubleshooting Thread Tension Sewing Machines, step 3

Vertical rotary shuttle hook system is the third type.
Many factors can lead to skipped stitches and leading other thread tension problems. But the correct position of the shuttle hook point is the main of them.
This shuttle hook device has the ability to adjust the position of the hook point relative to the needle. This feature allows perfect sew different fabrics, including knitted fabrics. If your sewing machine has such type a shuttle hook you need start trouble shooting of the thread tension problems with check the position of the hook point.

Troubleshooting Thread Tension Sewing Machines, step 4

So let's see what problems can occur in this type hook with top loading bobbin and how to fix them.
When loops appear on back of fabric you need adjust top thread tension. Start with adjusting your thread tension dial. If this does not helps check the tip of the needle which should be sharp and not bent. Check the threading. Perhaps you need to replace the spool.
These are simple tips using them you can fix thread tension problems easy. But there are times when all these methods do not resolve loops on the back of fabric.
Soon you will know another reason for. But first let's look at how the stitch is formed.

Troubleshooting Thread Tension Sewing Machines, step 5

The shuttle tip catches the upper thread and pull it around bobbin case.

Troubleshooting Thread Tension Sewing Machines, step 6

At this position the top thread jumps along the plastic shuttle surface.

Troubleshooting Thread Tension Sewing Machines, step 7

This segment of plastic shuttle surface is experiencing a heavy load. Over time, there appears small notches and grooves.

Troubleshooting Thread Tension Sewing Machines, step 8

They impede the free and easy sliding the top thread around the shuttle. This is the reason of appearing the loops under fabric.

Troubleshooting Thread Tension Sewing Machines, step 9

Remove grooves can be using a special abrasive tool, but the best way is to buy new plastic bobbin case and to replace it.

Troubleshooting Thread Tension Sewing Machines, step 10

The second reason leads to problems of stitching is the displacement of the needle bar. During stitching the leather or thick fabrics this needle bar of sewing machine can be shift up.
Check position needle ear with respect to the tip of the shuttle hook.
If you need to lower the needle bar you need to loosen this screw.

Troubleshooting Thread Tension Sewing Machines, step 11

Let's look closely at the thread tension assembly. Between these discs can be collected pieces of threads, fluff and dust. They interfere the normal operation of the device which leads to various defects in the stitches.
Remove these pieces of threads, fluff and dust with the tweezers, brush or using an awl.

Troubleshooting Thread Tension Sewing Machines, step 12

This driving belt can be also the cause of thread tension problems on your sewing machine. During stitching the leather or thick fabrics this belt may jump on 1-2 "tooth". This is a very complex repair, but you need to know about it.

Troubleshooting Thread Tension Sewing Machines, step 13

The needle plate surface should be without chipping of needle attacks. They can interfere the movement the fabric and the threads that affects the tension threads of stitches and affects the quality of the stitching.

Here is a list with the complex reasons of thread tension problems that is known only to the master. If you have tried the simple ways of setting the thread tension but your machine is still not working use this troubleshooting tips.

English isn't my first language, so please excuse any mistakes and help correct them.
E-mail for sending is on the contact page.

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