Product category:
Measurement systems
News Release from: Renishaw | Subject: RELM high accuracy linear scale
Edited by the Manufacturingtalk Editorial
Team on 26 October 2006
Intelligent encoders offer reliable high
speed
The RELM high accuracy linear scale is an exciting addition to Renishaw's SiGNUM range of intelligent encoders.
The RELM high accuracy linear scale is an exciting addition to Renishaw's Signum range of intelligent encoders Offering high speed, reliable, non-contact performance combined with advanced features including the IN-TRAC auto-phase optical reference mark and dynamic signal processing, the Signum range redefines encoder performance
This article was originally published on Manufacturingtalk on 7 Mar 2001 at 8.00am (UK)
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The system comprises the SR readhead, Si interface and 20 um pitch RELM scale.
The RELM scale incorporates Renishaw's IN-TRAC optical reference mark at either the scale mid-point or 20 mm from the scale end.
The IN-TRAC 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.
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Dual optical limits are also available to provide end of travel indication.
Manufactured from stabilised Invar, RELM has a low coefficient of thermal expansion (andasymp;0.6 um/m/C, 0C to 30C) and is offered in defined lengths with custom lengths available on request.
The robust, yet highly precise, 20 um scales offer a level of performance previously available only from more delicate fine pitch encoder systems.
With accuracy better than +/-1 um and resolution to 20 nm, RELM satisfies the most demanding precision motion requirements.
The robustness of the Invar scale permits a much smaller cross section than typical glass scales, yet allows easier handling and installation, without risk of breakage.
RELM scale is extremely easy to install and can be mounted directly to the substrate using mechanical clips and a datum clamp or a specially formulated adhesive backing tape and epoxy earth point.
The Si interface can be mounted remotely and the small connector on the readhead cable is easy to feed through machines where access is restricted.
Capable of operation to over 12 m/s and up to 85 C, the SR readhead features Renishaw's unique filtering optics to provide excellent immunity to dirt, dust and scratches.
Like all Signum encoders, the RELM encoder system benefits from Signum intelligent signal processing, which ensures excellent reliability and ultra-low cyclic error (andle; +/-30 nm).
In addition, comprehensive Signum software enables optimum set-up and real-time system diagnostics via a PC's USB port.
As with all Renishaw products, the Signum range is backed-up by a worldwide team offering truly responsive global support. Request a free brochure from Renishaw ...
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