The test is fun but not really very helpful. If you want to find out if your bobbin tension is right for the fabric and thread you are using for the project you can perform a simple bobbin tension test. Older machines or machines with front loading bobbins may need bobbin tension adjustment. In this case, it might be necessary to change the bobbin tension also. But sometimes the added tension is too big for the thread you are using and may cause thread breakage or skipped stitches. In most cases changing the needle tension is enough to get a perfect stitch. If the fabric is very fine there is no space between the fabric layers for threads to interlock, actually. If the tension is correct the needle and bobbin threads interlock between the fabric layers. This tension spring assembly is set at the factory. This is what gives the bobbin thread its tension.The screw is tightened and when the thread is going between this plate and the bobbin case there is some pressure applied to the thread. This small metal plate/spring is attached to the bobbin case with a screw. If you wonder where the bobbin tension disks/plates are on a sewing machine (Brother, Singer, Janome) you can see them in the video below. If you move these 2 parts closer together by tightening the screw the amount of pressure will increase, if you move them further apart by loosening the screw the amount of pressure will decrease. When a sewing machine is working the moving thread is “squeezed” between these 2 parts and the amount of pressure on the thread is controlled by a small screw.
One of these parts is a small flat bobbin case spring/plate/disk (I don’t know the name of the other part though). The printable version includes the sister article “ Sewing Machine Tension Adjustment“ What is the bobbin tension?īobbin tension (as I understand it) is a small amount of pressure on the thread in the bobbin case created between the 2 parts of the case. I only recommend products I believe in and use myself.Ī printable copy of this article is available for a small fee in my Etsy shop or my site shop. This means I will receive a commission if you order a product through one of my links. Note: Some of the links on this page are affiliate links.
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