Rotary encoders provide 1nm and 2nm resolutions
A
Renishaw product story
Edited by the Engineeringtalk editorial team
Nov 4, 2009
Renishaw has introduced 1nm and 2nm resolution versions of its Tonic incremental encoder range.
Available in linear- and rotary-encoder formats, the new higher-resolution options comprise a standard Tonic readhead and new Ti20KD (1nm) or Ti10KD (2nm) interfaces that apply high interpolation rates to achieve fine resolution.
Tonic's low-noise optical scheme with superior photometry has been combined with advanced filtering inside the Ti20KD / Ti10KD interfaces to reduce the jitter (noise on reported position) to just 0.51nm RMS.
The reduced jitter and increased resolution result in an encoder that enhances positional stability and low-speed velocity control.
This improvement is additional to the benefits of the dynamic signal conditioning included as standard on all Tonic readheads.
As a result, 1nm and 2nm Tonic incremental encoders offer all the benefits of a 20-micron pitch encoder, such as easy set-up, greater ruggedness and superior dirt immunity, yet they also rival the resolution and noise levels of much finer pitch encoders.
The linear-encoder version of Tonic is available with a comprehensive range of scale options.
RGSZ is the latest evolution of Renishaw's ubiquitous gold tape scale, now with integral In-Trac optical reference marks.
RELM Invar spars offer zero thermal expansion and +/-1um accuracy on lengths up to 1130mm.
For high performance on long axes and significantly more robustness than glass scales, RSLM stainless-steel spars have a total accuracy of +/-4um over 5m, with lengths up to 10m available.
For fast and easy installation, the Fastrack linear-encoder scale system comes with low-profile RTLC tape scale, offering +/-5um/m accuracy.
Rotary (angle) encoder options are also well served, with RESM rings in a range of standard diameters from 52 to 550mm, with even larger sizes available.
For even higher performance, ultra-high accuracy REXM ring encoders have a total installed accuracy of better than +/-1 arc second on ring diameters greater than 100mm, when used with dual readheads.
The interfaces have been named after their interpolation factors: Ti20KD refers to 20k digital interpolation (post-quadrature), which equates to 1nm resolution.
Tonic incremental encoders are backed by a responsive global sales and support network.
The product satisfies the highest environmental standards, with both WEEE and RoHS compliance.
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Contact Renishaw
Tel +44 1453 524524
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