Robot-Ready Automatic Pallet Changer for VMCs

Midaco’s Robot-Ready Automatic Pallet Changer package for vertical machining centers (VMCs) can increase unattended machining time. This robot-ready package takes the complexity out of automated part loading and machining by enabling a robot to load a full pallet of parts on an automatic pallet changer while the VMC is cutting. 

This automation solution is designed to enable manufacturers increase performance with only a skeleton crew, maintaining production during a regular shift or during lights-out manufacturing. Mounting parts onto pallets outside of the machine tool while other parts are being machined eliminates spindle idle time. Once the parts inside are complete, the pallet changer automatically switches the pallets in seconds and the next batch is ready to go. Users can regain valuable machining time, boost productivity and get more parts out the door. 

The cobot-fed Robot-Ready Automatic Pallet Changer is designed for VMCs ranging in size for approximately 22” × 15” (558 mm × 381 mm) up to 50” × 25” (1,270 mm × 635 mm) XY travel. The shuttle’s front control panel is customized to mount and integrate with the end-user’s choice of cobot, which can be purchased separately from an authorized dealer.

This system comes standard with two aluminum pallets which can be mounted on either the left or right side of the VMC. Easily integrated to the machine tool via M-codes, the shuttle is servo driven and automatically switches pallets in approximately 15 sec., depending on the combined part weight on the pallet. A cast iron pneumatic receiver is mounted directly onto the machine tool table. Hardened locating pins, ground bushings and hardened pallet rails ensure a repeatability of ±0.0001” (0.0025 mm). Each pallet’s weight capacity ranges from 500 lbs to 2,000 lbs depending on pallet size; however, the individual part weight depends on the cobot’s payload capacity. 

Combined with Midaco’s Hydraulic Docking System on the pallets, the robot/cobot can load parts on the pallet changer outside of the VMC unattended while the spindle is cutting, freeing the operator to perform other tasks. The hydraulic vises are automatically clamped and unclamped, and transfer into the machining center without the need for any hose management. The vises will stay charged on the pallet while in the machine tool. Once the cycle is complete, the pallet exits the machine, docks into place on the shuttle, vises release and the cobot can load a new set of parts while the alternate pallet is in the VMC being milled. It is said machining time is limitless and only dependent upon how many blanks can be set up within the robots reach on side carts or conveyor systems.