Renshaw Introduces High Accuracy Stainless Scale Linear Encoders

Renshaw Introduces High Accuracy Stainless Scale Linear Encoders

Renishaw ( has developed new linear encoders that feature a special stainless steel scale, ultralow ±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.

The company said its RSLM linear encoders are especially effective in longtravel applications, and are available in metal tape scale lengths to 5 meters (16.4 ft.)

The RSLM linear encoders are a new addition to Renishaw’s SiGNUM range of optical encoders. The company said the RSLM linear encoders overcome limitations of glass scale with superior durability, longer scale lengths, and easier installation, and use a special alloy stainless steel spar scale to deliver ruggedness and accuracy, including slope and linearity, of better than ±4μm.

Renishaw said the RSLM linear encoders, combined with its the ultra-low ±30 nm sub-divisional error (SDE) of its trademarked SiGNUM encode, makes it a robust unit for industrial conditions and applications in which neither durability or metrology can be compromised.

The RSLM is made from a hard, martensitic stainless steel, and 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.

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