Wood door slab processing system, and related methods

A workpiece processing system, comprising:

• a first carousel rotary conveyor comprising a first hub with a first rotational axis and a plurality of first arms, wherein the first arms are operable to hold and release workpieces conveyed to and from the first carousel rotary conveyor, and wherein the first arms are operatively connected to the first hub to rotate about the first rotational axis and thereby successively rotationally convey the workpieces through a first plurality of stations associated with the first carousel rotary conveyor;
• a second carousel rotary conveyor comprising a second hub with a second rotational axis and a plurality of second arms, wherein the second arms are operable to hold and release the workpieces conveyed to and from the second carousel rotary conveyor, and wherein the second arms are operatively connected to the second hub to rotate about the second rotational axis and thereby successively rotationally convey the workpieces through a second plurality of stations associated with the second carousel rotary conveyor;
• and
• an inter-carousel conveyor configured to selectively operate in a first mode and a second mode, wherein in the first mode the inter-carousel conveyor is operable to successively transfer the workpieces successively rotationally conveyed through the first plurality of stations from the first carousel rotary conveyor to the second carousel rotary conveyor for successively rotationally conveying the workpieces through the second plurality of stations, and wherein in the second mode the inter-carousel conveyor is operable to successively reorient the workpieces successively rotationally conveyed through the stations associated with a selected one of the first carousel rotary conveyor or the second carousel rotary conveyor by approximately 180 degrees of rotation for further successive rotational conveyance of the workpieces through the stations associated with the selected one of the first carousel rotary conveyor or the second carousel rotary conveyor.