Motion Control

Rotary Tables

EXSYS Tool (San Antonio, FL) offers pL LEHMANN 500 series ultra-high-precision rotary tables. The modular, multi-axis rotary tables allow users to upgrade a vertical machining center without incurring the expense of a new machine. Adaptable to almost any workpiece or production situation, the tables are available in four basic models that can be assembled into as many as 240 different configurations. More than 20 different clamping methods and behind-the-spindle accessories are available, including rotary unions, special clamping cylinders, and angular position measuring systems.

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Actuator Control

The DCH Series actuator control from American Control Electronics (South Beloit, IL) combines an AC-to-DC switching power supply with a regenerative PWM drive to create an all-in-one solution. The control is suited for applications requiring control of 12 or 24 VDC motors when only 115 or 230 VAC power is available. With an isolated front end, this series is compatible with a 0-5 or 0-10 VDC analog from any PLC. With an 8-bit onboard microprocessor, the control can be customized in many applications to replace a PLC. The series also provides an alternative to using higher-voltage controls with the output voltage turned down, which results in current spikes. The control includes an industry-standard microprocessor used on popular PLCs. A modified option allows for linear positioning control of actuators to within 1/1000 of commanded stroke length with the use of feedback resistors. Standard variations include options for torque, cycling, or positioning control. Standard I/O is 1 analog and 4 digital, with custom configurations available.

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Motor Controllers

PITTMAN® Motors, a business unit of AMETEK Precision Motion Control (Harleysville, PA), announced IDEATM PBL4850E programmable 3-phase brushless motor controllers that let users create distributed standalone motion profiles without the need for additional motion control components such as programmable logic controllers or field communication buses. The controllers feature automatic population of motion profile parameters based on the entry of a few motor characteristics. The 4-quadrant brushless controllers utilize sinusoidal commutation. They incorporate two motion profiles: trapezoidal and s-curve.

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Magnetic Encoder

The Model 30M low-profile, 30-mm-diameter magnetic encoder module from Encoder Products (Sagle, ID) provides incremental feedback by means of advanced sensing and signal processing technology. It combines a Hall-effect sensor, signal processing circuitry, and a small magnetic target that can be affixed to a rotating shaft via an optional shaft adaptor or insert. With a wide sensor-to-magnet air gap, the encoder tolerates shaft misalignment. The encoder offers resolution up to 1,024 CPR, a maximum frequency of 350 MHz, up to 8-pole commutation, an optional index channel, two voltage selections, and four output types. Connector options include an 8-pin M12, or an 8-pin or 16-pin Molex with an integral strain relief.

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Roller Chain

U.S. Tsubaki Power Transmission (Wheeling, IL) introduced Titan Series roller chain for high-speed and harsh environments. The ANSI chain utilizes a “Titan specific” chain construction that includes coated pins and pin links, black oxide roller link plates, G7 Solid Bushings, and ringcoined connecting links. The chain is available in a variety of options including single and multi-strand drive chains.

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Spindle Gear

maxon precision motors (Fall River, MA) announced the GP 6 S spindle for a variety of linear drive solutions. The maximum feed velocity is 15 mm/s, at a force of 10 N. Integrated ball bearings ensure that the drive stands up to high axial loads. The gear combines with the maxon DC brushed motor (RE 6) and DC brushless motor (EC 6).

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Z-Theta System

Catalyst Motion Group™, a Haydon Kerk Motion System integrator (Waterbury, CT), offers a Z-Theta system capability that provides a compact package to achieve a rotary axis and a linear axis in a single unit. When operated in coordinated motion, the system can effectively create a helical motion path. The Kerk brand ScrewRail® is the centerpiece of the system, with the linear and rotary power being supplied by Haydon and Pittman motor technology. Z-Theta systems are used for picker-type applications in automated kiosks, data storage libraries, and other repetitive motion tasks requiring both a linear and a rotary move. Loads of up to 100 pounds and speeds in excess of 10 inches/second are possible.

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Motion Controller

Soft Servo Systems (Waltham, MA) offers the WMX general motion controller that simultaneously controls up to 64 axes and 64 channels with control functions on the EtherCAT platform. It can run as an EtherCAT master on a commercially available PC with a LAN (Ethernet) port and no specialized interface board. Compatible with Windows 7, the PC-based system includes the original EtherCAT Master stack with EtherCAT functionalities including DC Sync and Hot Connect. It also includes a license of RTX, the Windows real-time extension tool. The controller allows for development of an original motion controller with a Windows Class Library that supports up to 256 threads and includes over 500 API functions, including EtherCAT network management.

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Rail Brakes

Profile Guide rail brakes from Nexen Group (Vadnais Heights, MN) are available in a range of sizes from 15 to 45, and provide engagement at 0.049 to 0.080 seconds. They provide static holding force to 2,600 N (585 lbs.), and can be combined to provide higher holding forces. The brake is suited for holding a load in position while failed reducers or motors are replaced. They also allow for the use of smaller drive systems because the brakes position and hold a load that might otherwise overpower the drive system. The brakes clamp onto the center of profile guide rails to provide positive braking and holding in all axes without touching the bearing surface of the rail.

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Slide System

Velmex (Bloomfield, NY) offers the Parallel-Coupled BiSlide System for long traverses and larger loads. The system features two identical BiSlide assemblies coupled with a timing belt to drive synchronous operation. It can handle loads to 600 pounds and is available in standard lengths up to 80 inches. The assembly is available in both manual and motor-driven models. The motorized models feature a double shaft motor on one slide and a heavy-duty bearing assembly on the other slide. The manually operated versions have the bearing assembly on both slides.

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