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.