Motion Control

Tubing Pumps

Masterflex® C/L® tubing pumps from Cole-Parmer (Vernon Hills, IL) feature a redesigned head that provides more secure tubing retention and more consistent performance over the full range of tubing sizes and flow. A single motion opens the cover and releases the occlusion bed for easy tubing changes. Tubing retainers are selfadjusting to accommodate tubing of different diameters. The peristaltic pumps are encased in a stackable, 1⁄4-DIN housing for mounting in an equipment rack or for placement on a lab bench. Pump head construction is of chemicalresistant engineered plastics and stainless steel. They also offer remote start/stop via contact closure, reversible flow, and a max-speed button for fast priming.

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Gear Motors

Applimotion (Loomis, CA) has introduced custom gear motors for high-torque, low-speed, and low-profile applications. The assemblies combine precision gearing and directdrive frameless motor kits to form a high-torque alternative to coupling a servomotor to a traditional gearbox. The ULT, UTH, and UTS low-profile frameless motors are combined with an appropriate gearing solution. These assemblies include precision bearings and high-resolution encoders. Gear motor assemblies can be created ranging in size from 25 to 800 mm diameter.

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Fasteners

The Key-Rex™ high-security fastener is available from Bryce Fastener (Phoenix, AZ). The special safeguard feature of the screw is the endless combination of complex shapes developed in the drive (head) of the screw. Each keyway shape and matching driver bit is licensed to only one client. Because the driver bit functions like a key, the manufacturer recommends that clients restrict use of the bits to authorized personnel. Any standard fastener can be fitted with the security feature, safeguarding the integrity of the design, or a fastener can be made to meet the design’s requirements.

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Linear Rail System

Haydon Kerk Motion Solutions, a division of AMETEK Precision Motion Control (Waterbury, CT), has introduced the BGS04 Linear Rail System designed for high-moment loads. The roll, pitch, and yaw moment load capability allows the system to maintain accuracy and repeatability in applications requiring significant cantilevered loading. The system features a Haydon™ linear actuator driving a Kerk® 303 stainless steel precision lead screw. The screw is coated with Black Ice® TFE coating, providing a permanent wear-resistant dry lubrication. The lead screw drives an anti-backlash nut embedded in a machined aluminum carriage mounted to a stainless steel ball rail. The linear rail is available with either the Size 11 (28mm) double stack or Size 17 (42mm) single stack hybrid linear actuator. Maximum roll, pitch, and yaw moments are 5.72 lb-ft, 4.88 lb-ft, and 5.68 lb-ft, respectively.

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Factors to Consider When Selecting and Specifying LVDT Linear Position Sensors

Fitting the right type of linear position sensor to an application requires at least a working knowledge of the attributes of this electromechanical device. Starting with the basics, the LVDT (linear variable differential transformer) is a common type of linear position sensor widely used in electromechanical systems today. It consists of two basic elements: a stationary coil assembly and a movable core or armature. While most LVDTs are fundamentally AC-in/AC-out devices, some have electronics built-in to make them DC-in/DC-out devices. This gives rise to the terms “AC-LVDTs” and “DC-LVDTs”.

Posted in: Features, Motion Control, Articles

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Connectors Enable Precise Movement of Lunar Robotic Tool Changer

NASA’s Langley Research Center in Hampton, VA hired Honeybee Robotics Spacecraft Mechanisms Corp. to develop a totally mechanical tool changer for the end of what Langley’s Lunar Surface Manipulation System (LSMS) team describes as a robot that could unload landers. Then, after the landers were unloaded, it could, in addition to doing base assembly, mate with tools to take science experiments. This robot could be likened to a crane, but with more dexterity.

Posted in: Application Briefs, Applications, Motion Control

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CNC Machine Controllers

B&R Industrial Automation Corp. (Roswell, GA) offers standardized system modules for CNC machines. Consisting of hardware components, all necessary software functions, and available simulation options, the software package makes it possible to quickly implement automation processes. The system integrates CNC, PLC, and motion control in one controller, and the function modules in the standard CNC package are designed to provide all important functions for CNC processing machines, including functions for operation, configuration, and diagnostics of the system, and in particular, all the axes and CNC channels.

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