Do you need upper and lower thread to sew?
Sewing machines need an upper and a lower thread to form the stitches. The lower thread is kept in a small bobbin stored underneath the presser foot. The mechanism for winding the bobbin may vary based on the model of your sewing machine.
What is the purpose of bobbin thread?
In general, the bobbin is the thing that feeds the thread to stitch from the lower part of the machine. Its purpose is to hold the thread below the needle, and it is where the thread in which you stitch comes from.
Your bobbin thread should not show through the top layer of stitching. It will only be seen on the back of the item. The reason you want to use a lightweight thread is to avoid too much bulk on the back of the item.
Why use bobbins with bite alarms?
One of the principal uses of a bobbin used in conjunction with a roller wheel bite alarm is to aid registration of line movement over the wheel. The roller wheel construction accounts for 99.9% of alarms sold… apart from Delkims which use a ceramic insert that detects line vibrations.
Is the bobbin supposed to spin?
Insert the bobbin making sure the bobbin rotates counterclockwise when you pull the thread. NOTE: This is a very important step as the bobbin can become unthreaded and cause sewing problems if it rotates clockwise.
Why can you use just one thread when sewing?
Believe it or not, this dart is sewn using only the bobbin thread! The purpose of sewing a dart in this manner is so that there will be no need to tie the threads or place a messy backstitch at the tip of the dart. Sometimes those tied threads can become untied and the tip of the dart will begin to open…