A planer/jointer is not always available to the home woodworker who wants to do fine cabinetry. Look at the piece of cabinetry in the photo. Each face has three pieces that were jointed and glued, but without a standard planer/jointer. The glue lines are almost invisible. You can find them only by looking closely for changes in the grain pattern.
Step 1: Use a Sanding Drum in Place of a Jointer
The graphic shows the basic setup. The work passes between a spinning sanding drum and a fence with a very straight edge.
In the graphic the sanding drum rotates in a counter-clockwise direction. The work moves over the table from right to left.
Cuts taken are very light. Flip the work over frequently so both sides of the work are staight and true when finished. When the sanding drum no longer cuts, loosen one of the "C" clamps and move that end of the fence nearer to the sanding drum only about the thickness of a pencil line. Clamp again and continue feeding the work past the sanding drum.