What should you check if the machine stitches are uneven or looping?

When machine stitches are uneven or looping, one of the primary factors to consider is the tension. Tension refers to the amount of pull on the thread as it moves through the sewing machine. If the tension is too tight, it can lead to excessive pulling, resulting in uneven stitches and thread looping on the underside of the fabric. Conversely, if the tension is too loose, the top thread may not be adequately pulled into the fabric, also causing similar issues.

Adjusting the tension is a crucial step in troubleshooting stitch quality, as it directly impacts how the threads interlock. Achieving the right balance is essential for producing even, smooth stitches. Other factors, such as fabric type and needle size, may influence sewing performance, but tension is the most critical element for directly addressing uneven or looping stitches. Thread color is not a contributing factor to stitch quality; it primarily affects the aesthetic aspect of the sewing project.