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June 1999
11.13 AUTOMATIC PALLET CHANGER (APC)
OVERVIEW
IMPORTANT!
Read this entire section before attempting to install or run the APC. Serious injury or
damage to the machine could result from not following these procedures.
The HAAS Automatic Pallet Changer (APC) is used to automatically load and unload pallets into a HAAS VF-3
or VF-4. The APC is controlled by the VMC control, and uses the same air and power supplies. A simple M
code (M50) is all that is required to change pallets.
The APC assembly consists of the base, which serves as the îš“homeîš” position for the two 19îš” x 40îš” pallets, and
a receiver assembly, which is bolted to the VMC table and holds the pallets in place during machining opera-
tions. The VMC unit contains air lines for clamping pallets, and a special automatic door in the side of the VMC
enclosure allows for loading and unloading of pallets. The APC has it's own operator's panel, which includes
CYCLE START, FEED HOLD, PALLET READY, and EMERGENCY STOP buttons.
The APC can be programmed to load a pallet or change pallets by calling an M50. When a pallet change is
programmed, the VMC table moves to the right and adjacent to the empty pallet position on the APC base. The
receiver assembly then unclamps the pallet. The automatic door opens, the table moves to the unload position,
and the pallet is pulled into itîš’s home position. The VMC table moves over to the other pallet position, the next
pallet is pushed onto the receiver, and the pallet is clamped into position. The table then returns to itîš’s pro-
grammed position and the door closes.
Pallet movement is accomplished through the use of a drive motor and chain. The drive motor has a non-
adjustable slip clutch that prevents damage to the motor if the pallet change is physically blocked.
Note: The machine will beep during a pallet change. This is an audible warning
signal, and not an alarm.
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