A splitter profiler module (101; 101a; 101b) for forming a board profile along a workpiece, wherein the workpiece is a log or a cant, the splitter profiler module (101; 101a; 101b) comprising: a frame ; an arbor rotatably coupled with the frame ; a first profiler arm assembly (134; 154) mounted to the arbor , wherein the first profiler arm assembly (134; 154) is configured to retain a first profiler head (132; 152) in axial alignment with the arbor and to transmit rotational motion of the arbor to the first profiler head (132; 152); a first saw arm assembly mounted to the arbor, wherein the first saw arm assembly is configured to retain a first circular saw blade in axial alignment with the arbor and to transmit rotational motion of the arbor to the first circular saw blade , wherein the first saw arm assembly is selectively axially moveable along the arbor , while the arbor is in rotation, to a profiling position in which the first circular saw blade is in contact with or close proximity to a corresponding side of the first profiler head (132; 152), and to a first splitting position in which the circular saw blade is spaced apart from said side of the first profiler head (132; 152) by a distance that corresponds to a desired width of the board profile, and wherein the first saw arm assembly includes a saw arm and a saw sleeve assembly , and the saw sleeve assembly has a first portion with a center annulus configured to slideably engage the arbor and a second portion fixedly connected to the saw arm ; and a carriage coupled to the saw arm and a guide member coupled to the frame , wherein the guide member is oriented substantially parallel to the arbor and the carriage is configured to movably engage the guide member . a frame ; an arbor rotatably coupled with the frame ; a first profiler arm assembly (134; 154) mounted to the arbor , wherein the first profiler arm assembly (134; 154) is configured to retain a first profiler head (132; 152) in axial alignment with the arbor and to transmit rotational motion of the arbor to the first profiler head (132; 152); a first saw arm assembly mounted to the arbor, wherein the first saw arm assembly is configured to retain a first circular saw blade in axial alignment with the arbor and to transmit rotational motion of the arbor to the first circular saw blade , wherein the first saw arm assembly is selectively axially moveable along the arbor , while the arbor is in rotation, to a profiling position in which the first circular saw blade is in contact with or close proximity to a corresponding side of the first profiler head (132; 152), and to a first splitting position in which the circular saw blade is spaced apart from said side of the first profiler head (132; 152) by a distance that corresponds to a desired width of the board profile, and wherein the first saw arm assembly includes a saw arm and a saw sleeve assembly , and the saw sleeve assembly has a first portion with a center annulus configured to slideably engage the arbor and a second portion fixedly connected to the saw arm ; and a carriage coupled to the saw arm and a guide member coupled to the frame , wherein the guide member is oriented substantially parallel to the arbor and the carriage is configured to movably engage the guide member . <EOS>