Exposed Linear Encoders - DR. JOHANNES HEIDENHAIN GmbH - #4

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4 Selection Guide Absolute position measurement The LIC exposed linear encoders permit absolute position measurement both over large paths of traverse up to 27 m and at high traversing speed. In their dimensions and mounting, they match the LIDA 400. Substrate and mounting Coeffi cient of expansion átherm Accuracy grade Absolute position measurement LIC for absolute position measurement Steel scale tape drawn into aluminum extrusions and tensioned Same as mounting surface ± 5 ìm Steel scale tape drawn into aluminum extrusions and fi xed .. 10 · 10–6K–1 ± 15 ìm ± 5 ìm2) Steel scale tape, cemented on mounting surface .. 10 · 10–6K–1 ± 15 ìm ± 5 ìm2) Incremental linear measurement LIP For very high accuracy Zerodur glass ceramic embedded in bolted-on Invar carrier .. 0 · 10–6K–1 ± 0.5 ìm3) Scale of Zerodur glass ceramic or glass with fi xing clamps .. 0 · 10–6K–1 or .. 8 · 10–6K–1 ± 1 ìm ± 0.5 ìm3) Glass scale, fi xed with clamps .. 8 · 10–6K–1 ± 1 ìm LIF For high accuracy Scale of Zerodur glass ceramic or glass, bonded with PRECIMET adhesive fi lm .. 0 · 10–6K–1 or .. 8 · 10–6K–1 ± 3 ìm LIDA For high traversing speeds and large measuring lengths Glass or glass ceramic scale, bonded to the mounting surface .. 0 · 10–6K–1 or .. 8 · 10–6K–1 ± 5 ìm3) Steel scale tape drawn into aluminum extrusions and tensioned Same as mounting surface ± 5 ìm Steel scale tape drawn into aluminum extrusions and fi xed .. 10 · 10–6K–1 ± 15 ìm ± 5 ìm2) Steel scale tape, cemented on mounting surface .. 10 · 10–6K–1 ± 15 ìm ± 5 ìm2) Steel scale tape drawn into aluminum extrusions and fi xed .. 10 · 10–6K–1 ± 30 ìm Steel scale tape, cemented on mounting surface .. 10 · 10–6K–1 ± 30 ìm PP For two-coordinate measurement Glass grid plate, with fullsurface bonding .. 8 · 10–6K–1 ± 2 ìm 1) Signal period of the sinusoidal signals. It is defi nitive for deviations within one signal period (see Measuring Accuracy). 2) After linear length-error compensation in the evaluation electronics 3) Higher accuracy grades available on request 4) other measuring lengths/ranges upon request Very high accuracy The LIP exposed linear encoders are characterized by very small measuring steps together with very high accuracy and repeatability. They operate according to the interferential scanning principle and feature a DIADUR phase grating as the measuring standard. High accuracy The LIF exposed linear encoders have a measuring standard manufactured in the SUPRADUR process on a glass substrate and operate on the interferential scanning principle. They feature high accuracy and repeatability, are especially easy to mount, and have limit switches and homing tracks. The special version LIF 481 V can be used in high vacuum up to 10–7 bar (see separate Product Information sheet). High traversing speeds The LIDA exposed linear encoders are specially designed for high traversing speeds up to 10 m/s, and are particularly easy to mount with various mounting possibilities. Steel scale tapes, glass or glass ceramic are used as carriers for METALLUR graduations, depending on the respective encoder. They also feature limit switches. Two-coordinate measurement On the PP two-coordinate encoder, a planar phase-grating structure manufactured with the DIADUR process serves as the measuring standard, which is interferentially scanned. This makes it possible to measure positions in a plane.