Action Machinery, Inc.
(502)-459-1313  Fax (502)473-1953
ALLTRA CORP EG-14


ALLTRA CORPORATION EG-14 (Economy Gantry Series)

 

INTRODUCTION

The ALLtra Model EG14 Shape Cutting Machine is a medium-sized CNC controlled gantry, designed for cutting complex shapes from sheet or plate materials (mild steel, aluminum, stainless steel, etc.). It is capable of producing quality parts at high speeds and close tolerances, fully utilizing the latest thermal cutting technology. The machine is configured for conventional plasma or the oxy-fuel shape cutting processes.

GANTRY FRAME

The model EG14 features a gantry style bridge frame traveling on a floor-mounted rack and pinion drive rail system. The gantry, comprised of two machined end-trucks which support the main cross axis beam and deck, provides the platform for the precision shape cutting processes. All components are of modular welded steel construction with machined mounting surfaces, and are bolted together to form a rigid frame. This proven design is the most rugged and accurate for heavy duty shape cutting and high speed positioning.

Each machine truck is equipped with an individual drive unit (dual-side drive), providing motion along the rail axis. The dual-side drive system prevents lagging, which could occur with a single-side drive system or a system that mechanically couples each side with an axle. Two eight-inch, hardened steel wheels located in each truck assembly ride along the top surface of the elevator-style rails (T171, 55.50 lbs/yrd), which are machined on the top and both sides. Guide bearings at each end of the master drive truck ride along the sides of the rail for accurate guidance. Wheel scrapers, rail scrapers, and an air blast nozzle located at each end of the truck help keep the drive rails clean.

The main machine beam is constructed of 7" by 7" tubular steel, 0.25" thick. It supports the individual cutting stations and the cross axis servo drive system. Bearings are used on the beam to accurately guide and support the cross axis carriages. The rear deck, which spans the width of the machine, provides a surface on which machine components can be mounted. Page 2 of 4

RAIL SYSTEM

The model EG14 machine utilizes floor-mounted, elevator-style rails for support and motion. The top and both sides of the rails are machined to ensure a smooth, flat surface for the machine to travel along. Heavy-duty leveling pads, spaced 43" apart, feature forged steel clips for fastening the rail to the pad and integrated adjusters for aligning the machine rail in all directions. Each leveling pad is anchored to the floor by two 0.75" bolts. The ends of each rail section are machined with a tongue and groove, providing positive side-rail alignment.

CARRIAGES

The basic machine includes one 16" wide master carriage with drive motor/gearbox assembly. It can be used to support several process stations, each of a different type (i.e., plasma, oxy-fuel and marker). Additional slave carriages, in any combination of 16" and 6" widths may be added as required. A stainless steel band is looped around pulleys at each end of the beam with the ends attached to the master carriage. Three-way band clamps allow each slave carriage to: a) follow the same path as the master carriage, b) follow a mirror image to the master carriage, or c) remain detached from the band when the station is not used.

SERVO DRIVE SYSTEM

AC Brushless servos, with a service life many times that of conventional brush type servos, are used for machine motion. The dual-side drive motors are synchronized by the PC-based controller (CNC).

The servomotors are directly coupled to a precision, planetary gear reducer. The drive pinion is mounted directly to the gear reducer output shaft. This design eliminates the belts and pulleys found on traditional motor/gearbox assemblies, which results in a low maintenance drive system.

 

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