Rotary cutting device having adjustable tension

A rotary handpiece suitable for cutting or severing a material comprising:

• a cutting member capable of rotary motion in first plane of movement,
• at least one cutting element capable of linear movement in a second plane of movement,
• said first plane of movement being arranged substantially transversely to the second plane of movement, said first and second planes of movement intersecting with each other at a point where the cutting member contacts the at least one cutting element;
• a handpiece body;
• a first spindle mounted in the handpiece body;
• and
• a second spindle which engages the first spindle;
• the first spindle, the cutting member and the second spindle being capable of rotating together relative to the handpiece body in the first plane of movement;
• the second spindle being movable relative to the first spindle to move the second spindle and the cutting member relative to the first spindle in a direction perpendicular to the first plane of movement, for applying tension to the cutting member to alter cutting characteristics of the handpiece,
• whereby the amount of clearance and the amount of contact between the cutting member and the cutting element is changed in order to alter the cutting characteristics of the handpiece to enable the handpiece to cut a wider range of material,
• wherein when said cutting member rotates in use, part of the cutting member contacts the cutting element to cut material located between the cutting member and the cutting element.