What is stitches per inch?
SPI is measured by counting the number of lengths of thread found within one inch. As you can see here, there are approximately 9 SPI sewn in this seam. Below is a list of garments and the typical number of Stitches Per Inch recommended for each of them.
Which stitches could be used to strengthen areas of a garment that have a lot of stress?
Reinforced stitching adds strength to areas that will be clipped or trimmed close to the stitching line or areas of high stress such as armhole, crotch and corners. There are 15 to 20 stitches per inch in a reinforced stitch. stay-stitching prevents fabric stretching.
Why do my stitches skip?
Skipped stitches are usually caused by an old or worn needle. With every stitch, there is friction placed on the point of the needle and with repeated action, the needle experiences abrasion. Over time, the needle becomes dull and doesn’t perform well. This results in skipped stitches.
How does a properly balanced stitch appear?
To easily test the balance of a straight stitch, use contrasting colors of thread in the needle and the bobbin. The stitch is balanced when you cannot see two colors of thread on the fabric.