Sewing machine mistakes, and why they happen. 1. The needle is too fine, when the needle tries to penetrate through multiple layers of fabric, the change in fabric thickness causes the needle to bend under pressure, and therefore break. A thicker needle would’ve been more effective. 2. The thread is snapping and getting caught in the fabric because it isn’t threaded correctly. This can also happen if the tension is too high or the thread is low quality. 3. The bobbin tail is too short, therefore