Inner Workings

Source Wikimedia Commons
Lockstitch.gif‎ (419 × 500 pixels, file size: 161 KB, MIME type: image/gif)

This is how a sewing machine works. Wow! This moving image explains so much. It so clearly shows how the top and bobbin threads work together to make a stitch and how the wrong sort of top or bottom tension can make things go wrong. And why using the right needle and threads is so important. This image is a fantastic teaching tool for anyone working with sewing machines.