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When threading a double needle, one must thread two spools of thread, which are placed on the machine concurrently. This setup may require additional adjustments in the tension settings to ensure even stitching. It's also crucial to use a walking foot or a dual feed feature on the sewing machine for the best results, as this helps manage the fabric layers effectively, particularly when working with heavier or slippery fabrics.

To begin using a double needle coverstitch, you will need a sewing machine that offers this function or an attachment compatible with your existing machine. Select the appropriate needles — double needles usually come in various widths and sizes for different fabric types. Ensure you use the correct thread (generally a combination of regular sewing thread on the top and a stretchy thread in the loopers).

Conclusion

Heavy-duty sewing machines provide extra stitch strength, often with triple feed teeth. The maximum stitch length is longer, up to 8mm versus 5mm, to allow bigger basting-type stitches in heavy fabrics. Extra strong stitches prevent seam rupture in heavyweight materials under stress.

4. Jeans/Denim Needles These needles have a thicker shaft and a strong, sharp point, making them perfect for piercing through heavy fabrics like denim.