Renishaw linear encoder features ultra-low cyclic error and filtering optics

RSLM linear encoders feature a special stainless steel scale, ultra-low ±30 nm cyclic error, patented filtering optics and ±4µm accuracy to deliver the performance of a fine pitch system without glass scale fragility and limitations.  Especially effective in long-travel applications, the RSLM is available in metal tape scale lengths to 5 meters.

New to Renishaw's advanced SiGNUM range of optical encoders, the RSLM linear encoders overcome the limitations of glass scale with superior durability, longer scale lengths, and easier installation.  The special alloy stainless steel spar scale combines ready-for-anything ruggedness with overall accuracy (including slope and linearity) of better than ±4µm - an industry first!  Combined with the ultra-low ±30 nm sub-divisional error (SDE) of the SiGNUM encoder, the robust RSLM is designed for industrial conditions and applications where neither durability or metrology can be compromised.

Manufactured from a hard martensitic stainless steel, RSLM offers a low coefficient of thermal expansion (10.8 µm/m/°C), while its special composition offers high resistance to corrosion.  Provided in easy-to-use tape form, the robust scale features a much smaller cross section than typical glass scales, allowing easier handling and installation without risk of breakage.  In addition, RSLM can be coiled for simple storage and handling, yet behaves as a spar scale once uncoiled.  System designers can choose between clip and clamp mounting or adhesive tape with epoxy anchor point, to suit their requirements.

The non-contact SiGNUM optical encoder system combines high speeds, high accuracy and wear-free reliability with advanced features, including the IN-TRAC auto-phase optical reference mark and dynamic signal processing.  The IN-TRAC auto-phase optical reference mark provides a bi-directionally repeatable datum point across the entire speed and temperature range (over 12 m/s and up to 85°C) without increasing overall system width.

The RSLM is available with multiple IN-TRAC optical reference marks regularly spaced for customer selection or a single reference mark, either at the center of the scale or close to the end of the scale.  Dual optical limits provide easy-to-use end-of-travel indication.

The SR readhead features Renishaw's unique filtering optics to provide excellent immunity to dirt, dust and scratches.  Like all SiGNUM encoders, the RSLM encoder system benefits from SiGNUM intelligent signal processing, which ensures excellent reliability and ultra-low sub-divisional error.  The SiGNUM software enables optimum set-up and real-time system diagnostics via a PC's USB port.

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