Spinning device

A spinning system comprising:

• a main spindle including an outer tube and an inner tube;
• a first rotor provided at an end of one of said outer tube and inner tube so as to be rotatable with said one of said outer tube and inner tube about an axis of said main spindle;
• a second rotor provided at an end of the other of said outer tube and inner tube so as to be rotatable with said other of said outer tube and inner tube about the axis of said main spindle, said second rotor being parallel to said first rotor and defining first and second guide routes about the axis of said main spindle;
• a first tool supported by said first rotor so as to be movable along said first guide route;
• a second tool supported by said first rotor so as to be movable along said second guide route;
• and
• a driving device for
• (i) rotatably driving said outer tube and said inner tube in the same direction about an axis of a non-rotatably supported member to be machined, and
• (ii) rotatably driving said outer tube and said inner tube relative to one another so as to revolve said first tool and said second tool, and so as to produce a difference in rotation between said outer tube and said inner tube such that as said first and second tools revolve,
• (a) said first tool moves in a radially outward direction along said first guide route while said second tool moves in a radially inward direction along said second guide route, and
• (b) said first tool moves in a radially inward direction along said first guide route while said second tool moves in a radially outward direction along said second guide route.