How do you use a FOX test to correct or test your embroidery machine tensions? The best way is to watch a training video like this on using the FOX test to test your tensions.  Are there other ways I can check my tensions on my machine? are there any tools I can use to check or adjust the tension? If the top thread tension is off on your machine your embroidery will never be right. No matter how diligent you are about changing needles, choosing thread, hooping and selecting only quality digitized designs, your work will not be up to par if the top thread tension is out of adjustment.  You need to use a tension test like the FOX test to correct your sewing problems whether you own a Tajima, SWF, HAPPY and Toyota embroidery machines. 

Go to Adjusting Embroidery Machine Tension using the FOX Test

How does the upper tension work and effect my embroidery?
The upper tension consists of two metal disks squeezed together by a coiled spring-the upper thread passes between the two disks. The applied pressure can be changed by an adjustment knob.  On the needle's downward stroke, it pushes the thread through the fabric, down next to the bobbin case. As the needle begins its upstroke, the needle thread forms a loop. A notch on the bobbin case holds the loop back while the bobbin hook catches the front of the loop and pulls it all the way around the bobbin. The needle continues moving upward, pulling up the needle thread, sliding it off the bobbin hook and out of the notch. As the needle moves higher, the upper thread tension pulls the bobbin thread up, forming an interlocked stitch.