Scroll manufacturing tool

A manufacturing tool for finishing a preformed scroll for use in a scroll type fluid displacement apparatus comprising:

• (a) a working member having an end plate and a first involute element extending from one end surface of said end plate, a cutting edge extending along an inner side wall of an axial end of said first involute, and said end plate having a plurality of arc shaped holes along an outer side wall of said first involute element;
• (b) a second involute element rotatably coupled to said working member and interfitting with said first involute element in a disposition to define a radial gap between the first and second involute elements, a cutting edge extending along an outer side wall of an axial end of said second involute, and a plurality of pins projecting axially from the other axial end of said second involute element and penetrating through said arc shaped holes, said pins being rotatably movable within said arc shaped holes;
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• (c) a rotatable member having a plurality of holes extending in the axial direction, said pins having extending into axial end portions said holes in said rotatable member to couple said rotatable member to said second involute member and to transmit the rotation of said rotatable member to said second involute element to effect relative rotation between said first and second involute elements to adjust said radial gap between them and thereby position said cutting edges into contact with said preformed scroll positioned in said radial gap to trim said scroll to finished dimensions.