Pallet Changer
A pallet changer is a workholding automation system that moves a loaded pallet carrying a vise, fixture, tombstone, or part between a machining position and an external load/unload station. This allows the machine to continue cutting while the next job is prepared. In CNC usage, it is commonly called an automatic pallet changer (APC) or exchange table.
On the shop floor, the machine cuts on one pallet while the operator, robot, or cell controller prepares the next pallet outside the enclosure. At cycle end, the control swaps pallets automatically, decoupling setup from spindle time and reducing non-productive time. This supports high-mix/low-volume and unattended production, and is commonly integrated on VMCs, HMCs, and flexible manufacturing cells. In millwork or fabrication environments, the same principle applies when a worktable or fixture platform is preloaded offline so panels or components can be exchanged quickly with minimal machine stoppage. The core value is moving clamping and preparation out of the machine’s critical path to increase throughput and improve repeatability.
What does APC stand for?
APC stands for Automatic Pallet Changer.
What problem does an APC solve?
It minimizes idle time between parts by allowing loading and unloading to happen outside the machining envelope while the spindle remains productive.
What machine types commonly use an APC?
APCs are especially common on VMCs and HMCs, as well as in automated cells and lights-out systems.