Method and apparatus for machining parts of partial revolution

A machine for machining parts of partial revolution comprising:

• a driving sheave rotatable about a first axis;
• a first driven sheave rotatable about a second axis fixed relative to said first axis;
• an eccentric link rotatably connected to said first driven sheave at a pivotal connection being spaced a predetermined distance from said second axis;
• a flexible band in contact with and wrapped around a portion of said driving sheave and said first driven sheave so that rotation of said driving sheave causes said first driven sheave to rotate;
• and
• a second driven sheave rotatable about a third axis fixed relative to said second axis, said second driven sheave in contact with said eccentric link, said eccentric link moving in a reciprocating motion when said first driven sheave is caused to rotate, said eccentric link causing reciprocating rotational movement in said second driven sheave when said first driven sheave is rotated, said second sheave adapted for connecting to a part to be machined so that said part rotates with said second driven sheave.