The lock stitch is formed when the needle penetrates the fabric, carrying the upper thread down into the fabric. The bobbin, located beneath the needle plate, feeds the lower thread and forms a lock with the upper thread, resulting in a firm stitch that is visually appealing on both the front and back of the fabric.
Understanding the Price of Cylinder Bed Sewing Machines
5. Durability Since you’ll be working with tougher materials, choose a machine made with sturdy components that can withstand the rigors of frequent use.