Abstract: Precise adjustment in the angular relationship between the converging paths of a pair rotary saw blades, is accommodated by the pivotal mounting of each motor driven saw blade assembly on an adjustment support plate carried by a common base fixed to the cabinet frame of a miter saw machine. The support plates are angularly adjustable about pivot pins having vertical axes perpendicular to the pivotal axes of the saw blade assemblies and intersecting the rotational axes of the saw blades.