Motion Control

Motion Controllers

ADLINK Technology (San Jose, CA) has released the PCI- 8254/PCI-8258 motion controllers that provide servo updates up to 20 KHz through hardware-based PID-FF control loop and secondorder filters, time-deterministic trajectory and velocity planning, comprehensive application functions, and diagnostic and control utilities. The program download function can execute up to eight individual tasks simultaneously, providing control performance in real time, and conserving CPU resources. The controllers also provide multidimensional interpolation, as in 3D linear/circular/spiral interpolation, for contouring applications in manufacturing industries such as laser engraving/cutting, glue dispensing, and others.

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Linear Stages

Newport Corp. (Irvine, CA), has introduced the FMSxxHA high-accuracy FMS stages for surface metrology applications. The stages are available in 100-, 200-, and 300-mm models. With all-steel construction, the stages combine high stiffness and thermal stability. The crossed roller bearings have an anti-creep feature to provide smooth and straight motion. The steel ball screw is designed for highspeed motion. The stages are driven by a stepper motor, with a linear encoder that provides on-axis accuracy down to 1μm and submicron bidirectional repeatability.

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Linear Scales

Model LF series linear scales from HEIDENHAIN Corp. (Schaumburg, IL) are used on highaccuracy machine tools, jig bore and grinding machines, and linear motors. The LF 485 and 185 incremental models feature very high repeatability and defined thermal expansion behavior. From a grating period of 8 μm, the interferential scanning principle of the LF scales produces scanning signals with a signal period of 4 μm. These scanning signals are largely free of harmonics and can be interpolated. Accuracy grades to ±2 μm are possible. The scales also offer resistance to contamination through the use of SUPRADUR steel scale tape together with a scanning ASIC with large scanning window.

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Wheel Force Transducer

Kistler North America (Novi, MI) has introduced the Kistler Type 9269A RoaDyn® S6HT System 2000, a six-component wheel force transducer (WFT) with specialty electronics platform. It is designed to measure three forces and three moments during complete chassis and component road load data acquisition (RLDA) and other on-road heavy truck, bus, civilian, and military special vehicle testing applications. The WFT incorporates six replaceable three-component heavyduty load cells. Each load cell is individually calibrated to allow sensor replacement without the need to recalibrate the entire system. An integral identification chip within each load cell stores important component parameters and prevents data misidentification. This feature allows data to be imported into the system’s onboard electronics upon startup.

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Brushless Servomotors

The SHX and SPX brushless servomotors for CNC machinery applications are available from NUM Corp. (Naperville, IL). They eliminate the need for a separate encoder cable; machine builders can use a single drive-to-motor cable for each motion axis. Available in 75-, 95-, 126-, and 155-mm frame sizes and three different lengths, the servomotors provide a choice of output power and speed ratings to match different machinery applications. Both motor ranges feature high mass moments of rotor inertia, optimized for machine tool feed axes. The SHX range includes models with continuous torque outputs from 1.2 to 20 Nm, and the SPX range offers units with continuous torque ratings from 1.4 to 23 Nm.

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Stepper Motor Driver

Lin Engineering (Morgan Hill, CA) offers the R525 stepper motor driver that reduces overall design time and system cost for an array of step motor applications needing high torque, power, and smooth motion. Measuring 3.3 × 1.3", the driver is accommodated into most systems. It provides up to 5 amps peak of current, handles up to 75VDC, and is capable of up to 256x microstepping with a standard 1.8° motor. It features builtin RS-485 communication, and can be connected to a computer and configured via a graphical user interface, LinDriver. Configurable settings include step resolution, run current, hold current, damping modes, and sensing step pulses on the rising edge or falling edge.

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Casters

Revvo Caster Company (West Seneca, NY) offers ET Series casters designed to move moderate loads via manual propulsion. Four-inchdiameter swivel models are available with an optional fixed-position brake that mounts to the top plate so the brake is always in the same position regardless of which way the swivel wheel is facing. The swivel models feature a double-ball raceway for smooth directional movement with the capability to withstand shock loading. Fixed and swivel models are available in wheel sizes of 4" and 5" diameter with load capacities ranging from 264 to 550 pounds. Wheel types include polyurethane-on-nylon with roller bearings, and black nylon or blue rubber with precision ball bearings. Fixed models have an oblong top plate. Swivel models are available with either a special top plate for the fixed-position brake (4" diameter models only), or a standard top plate. Accessories include wheel locks for standard swivel models and thread guards to prevent debris from binding the wheel.

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