The disclosure pertains to separably driven rotor portions for a combine harvester and a method for threshing grain using separably-driven rotor portions. The combine harvester is moved through harvest material comprising grain material and material-other-than-grain (MOG). The grain material is separated from the MOG using multiple processing areas. The auger portion may be stopped or rotated at a slower speed with respect to rotation of the threshing portion to simulate the gathering of a large amount of crop material even when small plots are involved, thereby providing the benefits of large-plot harvesting to small-plot applications.

An agricultural harvester has a chassis carrying a threshing and separating system for separating grain from Material Other than Grain (MOG). The threshing and separating system has a threshing rotor and at least one concave. At least one rasp bar is attached to the threshing rotor. The at least one rasp bar has an upper threshing surface and a trailing surface. The trailing surface is set at a draft angle. At least one trailing surface interrupter is located on the trailing surface and may be inclined slightly rearward from vertical. The trailing surface interrupters may be used with rasp bars with or without rasp bar spikes.

An agricultural harvester has a chassis carrying a threshing and separating system for separating grain from Material Other than Grain (MOG). The threshing and separating system has a threshing rotor and at least one concave. At least one rasp bar is attached to the threshing rotor. The at least one rasp bar has an upper threshing surface and a trailing surface. The trailing surface is set at a draft angle. At least one trailing surface interrupter is located on the trailing surface and may be inclined slightly rearward from vertical. The trailing surface interrupters may be used with rasp bars with or without rasp bar spikes.

Separably-driven rotor portions for a combine harvester and a method for threshing grain using separably-driven rotor portions are provided. The combine harvester is moved through harvest material comprising grain material and material-other-than-grain (MOG). The grain material is separated from the MOG using multiple processing areas. The auger portion may be stopped or rotated at a slower speed with respect to rotation of the threshing portion to simulate the gathering of a large amount of crop material even when small plots are involved, thereby providing the benefits of large-plot harvesting to small-plot applications.

A combine for harvesting a harvested material that includes a grain, the combine comprising: a threshing chamber comprising a series of threshing and separating apparatuses, sequentially arranged, comprising at least: (i) a straight bar concave (ii) a first round bar concave, and (iii) a second round bar concave. The size of each of the straight bar throats is smaller than a size of the first openings, and the size of each of the first openings is smaller than the size of each of the second openings.

A combine for harvesting a harvested material that includes a grain, the combine comprising: a threshing chamber comprising a series of threshing and separating apparatuses, sequentially arranged, comprising at least: (i) a straight bar concave (ii) a first round bar concave, and (iii) a second round bar concave. The size of each of the straight bar throats is smaller than a size of the first openings, and the size of each of the first openings is smaller than the size of each of the second openings.

A spine for providing structural support for a dual rotor harvesting machine, the spine having a first surface that is solid and directed towards a first rotor configured to rotate about a first axis and a second surface that is solid and directed towards a second rotor configured to rotate about a second axis. The spine also having at least one threshing insert positioned directly on the first surface and extending longitudinally along the first axis of the spine and at least one threshing insert positioned directly on the second surface and extending longitudinally along the second axis of the spine.

A spine for providing structural support for a dual rotor harvesting machine, the spine having a first surface that is solid and directed towards a first rotor configured to rotate about a first axis and a second surface that is solid and directed towards a second rotor configured to rotate about a second axis. The spine also having at least one threshing insert positioned directly on the first surface and extending longitudinally along the first axis of the spine and at least one threshing insert positioned directly on the second surface and extending longitudinally along the second axis of the spine.