Resolute Encoder Offers Sub-Micron Accuracy

Renishaw's Resolute absolute encoder is now available with Fanuc serial communications in linear encoder formats for high-precision machine tools, grinding machines and diamond-turning machines. Offering sub-micron accuracy and resolutions to 1nm, Resolute is a true absolute encoder, meaning it determines absolute position immediately upon switch-on, eliminating the need for battery back-up or reference returns.

It uses a detection method that is analogous to an ultra-high-speed digital camera reading from a non-repeating, fine-pitch barcode scale. Even at speeds of up to 100m/sec, images are captured, analysed and interpolated to resolutions as fine as 1nm. This technique features immunity to contamination, owing to a cross-checking and dirt-rejection capability, and also attains wide setup and running tolerances. Safety is assured through Resolute's built-in separate checking algorithm, which constantly monitors position and ensures any problems are flagged up before they reach the controller.

The combination of a high-performance readhead and scale technology also provides users with higher-fidelity encoder feedback. Dynamic response is significantly improved owing to sub-divisional error (SDE) being controlled to within +/-40nm, jitter (noise) of less than 10nm RMS and a non-contact format that eliminates the mechanical uncertainty of fragile wheeled carriages found inside traditional enclosed linear encoders for machine tools.

Overall accuracy to better than +/-1um is offered as standard on RELA Invar scales, while RSLA stainless steel scales offer very high accuracy at lengths of up to 5m. Also available are RTLA and RTLA-S rugged steel tape scales, which allow +/-5um/m accuracy, lengths of up to 10m and quicker and easier installation. The range of absolute encoders is also available in angle encoder format and with a variety of protocols to interface with a range of industry-standard servo drives and controllers.

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