KTR Develops Coupling For Measurement And Control

KTR's Countex Coupling is a three-part, backlash-free, torsionally stiff coupling used mainly in measuring and control technology, such as encoders and tachometers. The compact design of the coupling is characterised by its simple assembly, reliable performance and suitability for use in confined spaces. The double cardanic design allows the coupling to compensate for all potential misalignments with minimal restoring forces.

The axial 'plug-in' of the coupling ensures an easy blind assembly. The coupling has aluminium crown-shaped hubs on the outside diameter, with a toothed cage made from temperature-resistant nylon. Set screws secure the hubs against axial movement. Countex can be used in temperatures of up to 160C. The first Countex Coupling available was a size 14 with rated torques of 1Nm and maximum bore diameter of 14mm.

KTR has now extended the range to include the smaller size 6 Countex Coupling with a rated torque of 0.3Nm and maximum bore diameter of 6mm. The coupling is available from stock at KTR with a range of bore sizes.

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Renishaw Exhibits Motion-Control Products At ATX

At ATX 2010, taking place in Anaheim, California, from February 9-11, Renishaw will focus on its latest range of motion-control products. These include a true absolute optical encoder for rotary and linear applications, a track-mounted linear-encoder-scale system and magnetic-encoder chip. Also on show will be the QC20-W wireless ballbar, which assesses machine-tool positioning and servo-control performance, and now includes a volumetric testing capability, plus a range of touch probes and probe software that increase machine-tool automation and improve process control.

For visitors sourcing offline measurement products, there will also be the opportunity to discuss Renishaw's retrofit service for coordinate-measuring machines (CMMs), including Modus - the company's first metrology software. Resolute is a true absolute optical-encoder system featuring dirt immunity and a specification said to break new ground in position feedback. Resolution is 1nm at 100m/sec for linear-encoder and angle-encoder applications.

Absolute position is acquired immediately at system switch on, so the exact orientation of axis and motor-commutation angle are known without the need for a reference (datum) return. Large setup tolerances also enable easy installation and high reliability, while low jitter and SDE (Sub-Divisional Error) meet the demands of high-precision stages. Fastrack is a track-mounted linear-encoder-scale system that combines +/-5um/m accuracy with the ruggedness of stainless steel and the quick and easy installation of a carrier-type encoder system.

Designed for applications that demand high accuracy and easily removable scale, the Fastrack scale system consists of two miniature guide rails that securely retain Renishaw's low-profile scales and allow them to freely expand at their own thermal-expansion coefficient with almost zero hysteresis. If damaged, the scale can be pulled out of the guide rails and quickly replaced, even where access is limited.

Renishaw's AM4096 magnetic-encoder IC provides UVW outputs with 16 poles (eight pole pairs) and incremental, absolute, linear (potentiometer), tacho generator and sinusoidal outputs. Resolution is to 12-bit (4096 steps per turn), with a programmable zero position, and it is capable of operation to 30,000rpm. Typical applications for the on-chip magnetic encoder include commutation and high-speed motor control, position and velocity control, potentiometer replacement and optical-encoder replacement.

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Flex Connectors Supplies Light Control For Youths

Flex Connectors' energy saving lighting control and connection products have been used in a youth venue in Norwich. The project is part of myplace; a ten year Government scheme which aims to provide improved facilities for young people. OPEN is the first of these venues to be completed in the UK.

The installation contractor required a system capable of handling the complexities of the lighting brief. Flex Connectors occupancy sensors, plugs, leads, sockets and project configured connection boxes were chosen to use throughout the building.

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