Pallet changer system APC (automatic pallet changer) for the 48 V models. You can increase the productivity of your compact vertical machining center by adding the optional APC. The APC can be used to load and unload the ......Pallet changer system APC (automatic pallet changer) for the 48 V models. You can increase the productivity of your compact vertical machining center by adding the optional APC. The APC can be used to load and unload the clamping table while the workpieces clamped on the second clamping table are being machined.