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How to adjust bobbin timing

Step 2: How a Bobbin Works

Picture of How a Bobbin Works
Sewing machines are a mystery to a lot of people, but this website has a great animation that shows how a bobbin works.

There are 2 main parts that I will be talking about today

1. The Bobbin Case
2. The Shuttle Race/Shuttle Hook

The Shuttle Race is made of 2 parts.  The part on the inside is stationary, and the part around the outside rotates and grabs the thread as you sew (aka. the hook).
 
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