Gantry Takes Hands Out Of Part Handling

A part queue enclosure is standard on the gantry and can use a stacker arrangement or palletizer for unsupervised load/unload of lathes and other machine tools. Two trolleys with nine part trays store up to 400 blanks and finished workpieces. One trolley can be prepared with a batch of blanks while the other is feeding the machine tool.

This gantry loader is designed to be installed on a variety of machine tools. Its cantilever design is freestanding, independent of the machine it services, so the two units are not mechanically connected.

With a travel range of 2,500 mm in the X axis by 1,200 mm in the Y axis, the gantry covers the work zone of most turning centers. Twin grippers have a load capacity of 2.5 kg and can be programmed to load/unload main spindles or subspindles.

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Throughout metalworking, shops are looking for ways to reduce manufacturing costs through productivity and efficiency gains on the shop floor. Automating material delivery and removal from the machining process is one key method of taking some of the production cost from manufacturing.

Iemca, known for automating machine tools with its line of bar feeders, has introduced a new gantry system for chucked parts. The U.S. debut of Automata 2.5 at the Eastec 2006 show in Springfield, Massachusetts, attracted good traffic and strong interest, according to company representatives working the booth.

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Typically, gantry load/unload devices are integral to the machine tool they are designed to automate. The Automata is a generic loader designed to automate parts loading for lathes, grinders and machining centers.

It uses a cantilever design with a free-standing gantry arm that carries the load/unload manipulator. It has an X-axis stroke of 2,500 mm and a Y-axis stroke of 1,200 mm creating a working zone that encompasses most machine tools. Part capacity is 2.5 kg for the workpiece blank. Typical load/unload cycle time is 7 seconds, which varies based on application.

An advantage of the cantilever design, the company says, is that the entire gantry unit is free standing and not mechanically connected to the machine tool it services. Therefore, no operational vibration is transferred from the gantry’s motion to the machine when the machine is in cycle.

Installed on the headstock end of a turning center, the Automata loader travels above the top of the machine tool, allowing full access to the front of the machine. A special door, designed for the machine tool being automated, is installed on the machine to allow access for the gantry arm and part manipulator.

In operation, the gantry takes part blanks from either a pallet or stacker within the gantry’s superstructure. Depending on the part, nine or more trays can be loaded off-line onto a wheeled cart. Two of these carts come standard with the gantry so one can be prepared while the other is feeding the machine tool. For a 20-mm-diameter blank, capacity is 792 parts for each cart.

Blanks are picked from the processed tray and loaded into the machine tool for machining. The loader has two grippers that remove the finished part and load the new blank in a single trip inside the machine. The gantry can also service a subspindle if the machine has one.

Completed parts are returned to the tray, and when a tray is fully processed, the next tray of blanks is automatically positioned under the gantry. This process goes on until all blanks on the trays are machined. Once a full trolley of parts is processed, it is removed, and the next trolley can be rolled into position.

This automated system creates the opportunity for post-process gaging or other automated inspection/checking devices to be installed. For example, the gantry could be programmed to pass a finished part through a laser gage and use that data for dimensional verification and closed-loop feedback to the machine’s CNC for automatic tool compensation.

Programming the Automata is via a simple hand-held control that teaches the loader through a single walk-through. Programs can be captured and reused on subsequent part orders to expedite change-over. Gantry cycles are initiated by M-code from the machine tool CNC, so the loader and machine remain in sync during operation.

Automating material handling on lathes or other machine tools frees operators to supervise a larger number of machines, lowering the direct cost of labor and helping shops become more competitive. The Iemca Automata is a cost-effective way to automate existing or new equipment.

— Bucci Industries USA