Скачать или смотреть How to adjust the bobbin tension on a Jack industrial sewing machine.

Adjusting the bobbin tension - This is crucial for achieving a strong, balanced, and aesthetically pleasing stitch. It's a fundamental skill that allows you to adapt to different fabrics, threads, and sewing techniques, ensuring the top and bottom threads interlock perfectly in the middle of the material.

The primary function of the bobbin is to supply the bottom thread in the stitch formation. The bobbin tension controls the amount of resistance on this thread as it's pulled up to meet the needle thread. When this tension is correctly balanced with the upper thread tension, the result is a uniform stitch that looks identical on both the top and bottom of the fabric.

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