Head - The complete sewing machine without cabinet or carry case.
Bed - The flat surface of the sewing machine. A flat bed machine has one level to sew on. A free-arm bed has a removeable U-shaped part of the bed to reveal an arm or tub used for sewing hard-to-reach areas like a pant cuff or sleeve.
Hand wheel - the wheel located on the right side of the sewing machine. This wheel is driven by the motor, but may be turned by hand to adjust needle height.
Bobbin Winder - Mechanism used to wind bobbins.
Bobbin - Low spool that provides the lower thread.
Thread take-up - Arm that pulls up slack in thread.
Thread guide - Device which carries thread to a certain location.
Upper tension - Mechanism which controls delivery of upper thread.
Lower tension - Provided by the bobbin case. Controls delivery of the bottom thread.
Bobbin Case - Device which hold the bobbin and provides tension to the lower thread.
Pressure Foot - Foot that presses down on fabric to stabilize its movement.
Feed Dog - Mechanism which controls motion of the fabric.
Needle Plate - Plate under pressure foot with slots to allow feed dog to reach fabric and openeiong for the needle to move up and down.
Hook - Device which picks the thread off of the needle.
Feed drop - Adjustment used to take the feed dog out of play for free hand work.
Stitch length - Adjustment used to determine length from front to back of the stitch.
Stitch width - Adjustment which allows a variety of widths from side to side.
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How many parts does sewing machine have? 
