How do shapers and planers machine flat surfaces?

Shapers and planers are machine tools used to create flat surfaces, grooves, and angular features using a single-point cutting tool. While they perform similar operations, they differ in their mechanical approach to machining:1

• Shapers: In a shaper, the cutting tool is mounted on a reciprocating ram that oscillates back and forth. The tool performs the cutting action on the forward stroke, while the workpiece, held in a vise or on a table, automatically feeds toward the tool during each return stroke.12
• Planers: In a planer, the cutting tool remains stationary during the cutting stroke. Instead, the workpiece is mounted on a reciprocating table that moves beneath the tool. After each pass, the tool automatically feeds into the workpiece.13

Because of these designs, shapers are typically used for smaller parts, while planers are capable of machining much longer workpieces, sometimes reaching up to 50 feet in length. Both machines allow for the adjustment of the tool angle, enabling the creation of diverse surface geometries.132