There is provided a concave for a rotary combine which includes a body having a plurality of curved frame sections connected in parallel side by side relation. Each of the curved frame section has having ends and sides. The body has an entry end and an exit end. Each of the curved frame sections has a face with an upstanding crop processing profile. For the curved frame sections at the entry end of the body the crop processing profile is a threshing profile having an orientation extending between the sides. For the curved frame sections at the exit end of the body the crop processing profile is a separation profile of sine wave vanes having an orientation extending toward the ends and having apertures positioned between the vanes to permit passage of grain.
