Renishaw: RESOLUTE linear scale - RELA A-9766-0070

RELA absolute high accuracy Invar scale is compatible with Renishaw’s revolutionary new, true absolute optical encoder system, . RELA offers certifi ed ±1 µm accuracy, combined with low thermal expansion Invar to suit the most demanding precision applications. The high performance of the scale is augmented by Renishaw’s RESOLUTE absolute optical readhead offering ±40 nm sub-divisional error, resolution to 1 nm, low noise (jitter) and a maximum speed of 100 m/s. RELA provides good dirt immunity and ease of set-up, whilst offering levels of performance previously only available from delicate fi ne pitch systems.

What is RESOLUTE?

RESOLUTE is a true-absolute fine pitched optical encoder system that has excellent dirt immunity, and an impressive specification that breaks new ground in position feedback. It is the world's first absolute encoder capable of 1 nm resolution up to 100 m/s. Ultra low SDE and jitter result in a linear encoder system that outperforms any other encoder in its class.

What is RELA30 scale?

RELA30 is a spar scale manufactured from ZeroMet, a low expansion nickel/iron alloy, featuring our 30 µm pitch absolute scale code.
It is comparable to fine pitch glass scales and offers a total accuracy (including slope and linearity) better than ±1 µm up to 1 m length. ZeroMet has a coefficient of thermal expansion of 0.75 ±0.35 µm/m/°C at 20 °C.
System designers can choose between specially formulated adhesive tape or mechanical clips to suit mounting requirements. Both mounting methods allow for independent thermal expansion to that of the substrate.

System features

• Single track optical absolute scale • ±1 µm guaranteed accuracy • 30 µm scale pitch ensures exceptional motion control performance • Robust Invar offers ~0.6 µm/m/°C (0 °C to 30 °C) thermal expansion plus ease of handling and installation • Scale mounting options, self-adhesive or clips and clamps • Available in lengths up to 1130 mm • ±40 nm sub-divisional error for smooth velocity control • Resolution to 1 nm • Maximum speed of 100 m/s