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Renishaw: REXT ultra-high accuracy rings
Renishaw: REXT ultra-high accuracy rings Model: REXT20USA104
 
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Description Ordering Information Specifications and Drawings
 

Renishaw: REXT ultra-high accuracy rings

With zero coupling losses and exceptional repeatability, the REXT ultra-high accuracy angle encoder achieves better than ±1 arc second total installed accuracy. Like the RESM encoder, the REXT is a stainless steel ring with the scale graduations marked axially onto the periphery, but with a number of differences to improve upon RESM’s already impressive accuracy.REXT has a thicker cross-section, to ensure that the only signifi cant installation error is eccentricity. Eccentricity is easily removed using 2 readheads, either with Renishaw’s DSi (Dual Signal interface), or by combining the signals inside the host controller. The only errors remaining are graduation errors and readhead SDE, both of which are so small they are often negligible. As a non-contact encoder,REXT offers dynamic performance advantages eliminating coupling losses, oscillation, shaft torsion and other hysteresis errors that plague enclosed encoders. Combining two readheads is easy with the DSi, which also offers an angularly repeatable reference position (propoZ ™) which is unaffected by bearing wander or power cycling. The REXT system operates at temperatures up to +85 °C ( ) and speeds to 4500 rev/min.

Designed for axes that are limited to partial rotation, REXT rings have two reference marks, oriented diametrically opposed, for use with partial arc versions of DSi. DSi processes these reference marks to give a single, angularly-repeatable propoZ reference output.

REXT ultra-high accuracy rings

REXT ultra-high accuracy rings have two reference marks 180 degrees apart, for use with partial-rotation DSi.

For ring diameters >417 mm please contact EPD

Series

Scale pitch

Form

Diameter

Part number

Price US$

REXT

20U (20 µm)

A (standard section)

052

REXT20USA052

2,101

057

REXT20USA057

2,101

075

REXT20USA075

2,273

100

REXT20USA100

3,737

103

REXT20USA103

3,737

104

REXT20USA104

3,737

115

REXT20USA115

3,780

150

REXT20USA150

3,823

183

REXT20USA183

3,909

200

REXT20USA200

3,995

206

REXT20USA206

3,995

209

REXT20USA209

3,995

229

REXT20USA229

4,167

255

REXT20USA255

4,396

300

REXT20USA300

5,803

350

REXT20USA350

6,923

417

REXT20USA417

8,989

RENISHAW: REXM/REXT ultra-high accuracy angle encoderSupporting Links



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