Method of making a rotor for a threshing system of an agricultural combine

1. A method of making a rotor for a threshing system of an agricultural combine, comprising steps of:

providing a sheet having an outer surface including opposite end portions, a first peripheral edge extending between the end portions having a stepped shape and a second peripheral edge opposite the first peripheral edge;

forming a stepped shape along the first and second peripheral edges, the stepped shape extending between the end portions, wherein forming the stepped shape includes forming recessed edge portions and protruding edge portions into a plurality of shapes wherein no two recessed and protruding edge portions have the same shape along each respective first and second peripheral edge, the first and second peripheral edges being configured and positioned so as to be interlockable when brought together for forming the sheet into a tube;

forming the sheet into a tube wherein the outer surface extends circumferentially around the exterior of the tube and wherein the opposite end portions of the sheet form opposite circular shaped openings so;

attaching a plurality of threshing element mounts to the outer surface at attachment points on the recessed and protruding edge portions around the tube in spaced relation to the first and second peripheral edges; and

interlocking the first and second peripheral edges together, wherein because of the stepped shape the first and second peripheral edges define a serpentine seam routed around the attachment points.

2. The method of claim 1 , wherein the interlocked first and second peripheral edges are welded together.

3. The method of claim 1 , wherein the threshing element mounts are welded to the outer surface.

4. The method of claim 1 , wherein the attachment points are in a predetermined pattern forming a helical pattern.

5. The method of claim 1 , wherein the tube has a cylindrical shape.

6. A method of making a rotor for a threshing system of an agricultural combine, comprising steps of:

providing a sheet having an outer surface including opposite end portions, a first peripheral edge extending between the end portions and a second peripheral edge opposite the first peripheral edge to a tube;

forming a stepped shape along the first and second peripheral edges, the stepped shape extending between the end portions, wherein forming the stepped shape includes forming recessed edge portions and protruding edge portions into a plurality of arcuate only shapes, wherein no two recessed and protruding edge portions have the same shape along each respective first and second peripheral edge, the first and second peripheral edges being configured and positioned so as to be interlockable when brought together for forming the sheet into a tube;

forming the sheet into the tube wherein the outer surface extends circumferentially around the exterior of the tube and wherein the opposite end portions of the sheet form parallel, oppositely facing circular openings;

attaching a plurality of threshing element mounts to the outer surface at attachment points on the recessed and protruding edge portions around the tube in spaced relation to the first and second peripheral edges; and

welding the interlocked first and second peripheral edges together, wherein because of the stepped shape the first and second peripheral edges define a serpentine seam routed around the attachment points.

7. The method of claim 6 , comprising a further step of mounting an element to the tube in covering relation to at least one of the circular openings.

8. The method of claim 6 , wherein the attachment points are in a predetermined pattern forming a helical pattern.

9. The method of claim 6 , wherein the tube has a cylindrical shape.