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

ALLTRA CORPORATION PG-14 (Precision Gantry Series)

This is our “PG14” series system. This is where the fiber-optic / SERCOS systems begin, with lots of options, including the rotary, full-contour plasma station.


 

 

 

 

 

INTRODUCTION

The ALLtra Model PG14 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, precision plasma, or oxy-fuel shape cutting processes and can easily be customized for special applications (i.e., drilling, beveling, etc).

GANTRY FRAME

The model PG14 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 8" by 12" tubular steel, 0.50" thick. It supports the individual cutting stations and the cross axis servo drive system. Dual linear ways 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 several important machine components are mounted such as the machine I/O cabinet, drive amplifier cabinet, gas regulator/control unit, and plasma system components. 

RAIL SYSTEM

The model PG14 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 8" wide master carriage with drive motor/gearbox assembly. It can be used to support up to three process stations, each of a different type (i.e., plasma, oxy-fuel, marker). Additional slave carriages, in any combination of 16" and 8" 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. The machine can also be equipped with automatic torch spacing, where each station has its own drive motor/gearbox assembly. This configuration eliminates the need for the steel band and may increase the available cutting width. Automatic torch spacing may also be used in conjunction with the station band clamps, so that some of the stations have automatic spacing while the other, less often used torches are manually spaced.

SERVO DRIVE SYSTEM

AC Brushless servos, with a service life many times that of conventional brush type servos, are used for machine motion and plasma height control. The dual-side drive motors are synchronized by the PC-based controller (CNC) through a digital (SERCOS) interface to the drive amplifiers. This digital interface allows for faster, high resolution positioning speeds and accuracy required by today’s high performance plasma systems. It also helps eliminate the possibility of electrical noise affecting the motion of the machine, as can happen in standard analog interface systems.

The servomotors are directly coupled to a high-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. The precision gear reducer, with a maximum backlash of six arc-minutes, has less than 0.002-inches of backlash at full load.

OPERATOR CONTROLS

The PC-based CNC is interfaced with an Operator’s Console utilizing a Programmable Logic Controller (PLC) for manual process control. The PLC offers easy modification and integration of additional stations at minimal cost. Special functions can be programmed in the PLC to control auxiliary machines or processes. The electronic modular design simplifies trouble shooting. Should a problem arise, maintenance personnel can monitor the PLC and quickly pinpoint the problem area.

The Operator’s Console includes:

Speed Control Knob

Emergency Stop Switch

Individual Station Selection (On/Off)

Individual Lifter Control (Up/Down)

Master Lifter Control (All Up)

Manual Preheat and Cutting Oxygen Control

Gas Control Indicators

Plasma Voltage/Current Control (Optional)

Water Table Level Control for Multiple Tables (Optional)

CUTTING CAPACITY (MODEL SIZE)

Table 2-1 below shows the PG14 model sizes available. The cutting width represents the base machine with one process station on the main carriage. Adding additional torch stations/carriages will decrease the maximum single cut width capacity by the width of each station added. Please contact ALLtra Corporation for more information on cut capacity with particular machine configuration requirements. Model

Cutting Width ft.(m)

Maximum Table Width ft.-in. (m)

PG14-6

6’ (1.83)

6’-8" (3.25)

PG14-8

8’ (2.44)

8’-8" (2.64)

PG14-10

10’ (3.05)

10’-8" (3.25)

PG14-12

12’ (3.66)

12’-8" (3.86)

PG14-14

14’ (4.27)

14’-8" (4.47)

PG14-16

16’ (4.88)

16’-8" (5.08)

 

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