1. Introducing RG2 series encoders
Renishaw plc
02/12/2017
Introducing RG2 series encoders
20 µm-pitch scale system
Range of readhead sizes for a wide variety of applications
Ultra-high vacuum (UHV) compatibility
Strong reputation built over decades of faultless service
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Renishaw’s first encoder range entered the market 20 years ago.
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2. Value Value to you Renishaw plc 02/12/2017
Proven reliability
Easy set-up
Versatile
Value
High speed
Robust
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Proven reliability: 20 years of faultless operations across industry.
Versatile: Suitable for a range of applications including ultra-high vacuum (UHV) and those requiring minimum system sizes.
Robust: Strong metal readhead bodies with IP50 and IP40 sealing. Range of stainless-steel spar and tapes available.
High speed: Allows faster processes and higher throughput.
Easy set-up: Set-up and calibration procedures designed to streamline production-line installation and subsequent servicing.
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3. Renishaw plc
02/12/2017
Specifications
Vacuum compatible readhead variant (RGH20F and RGH25F only)
Both 20 µm-pitch linear and rotary scales available
Compact readhead sizes as small as 36 mm x 13.5 mm x 10.5 mm
Linear resolutions to 5 nm and linear speeds to over 5 m/s
Rotary angular speeds to 2940 RPM (RGH20)
Choose either analogue or digital outputs
Linear system accuracy greater than 1.5 µm/m
Rotary system accuracy to ±0.5 arc second
LED indicators for easy set-up and calibration
Please read the notes below:
Minimum RG2 encoder readhead size is for RGH20F and RGH25F (UHV) variants = 36 mm x 13.5 mm x 10.5 mm (length x width x height).
If additional specs are required, refer to the relevant data sheet.
These are the headline features and are considered appropriate for this type of introductory presentation.
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4. Real-life applications
Renishaw plc
02/12/2017
Real-life applications
Taiwan’s UMA Technolgy Inc develops optical testing equipment to ensure smartphone camera lens quality
UMA selected RGH22 encoders with RGS-20 tape for a screw- driven X-Y mobile platform for lens positioning to improve the accuracy and precision of an existing motion stage “
The mobile platform is one of the core components of the testing equipment. Prior to redesign, the linear stage was driven by only stepper motors, offering an unsatisfactory level of repeatability. Installation of Renishaw’s RGH22 encoder system has enhanced resolution to 0.1µm, which improves our product competiveness “
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5. RG2 basic principles Readhead sensor uses patented filtering optics
Renishaw plc
02/12/2017
RG2 basic principles
Readhead sensor uses patented filtering optics
RS422 digital output or 1 Vpp direct from readhead OR
Manual reference mark phasing. REE interpolator and REF interface use advanced algorithms to allow easy calibration
For higher performance applications, the REF interface and REE interpolator allow access to higher resolutions and reduced SDE
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Within the readhead, an infra-red LED emits light laterally onto a scale with reflective and non-reflective areas. The light is directed back off the reflective areas through a transparent phase grating.
This produces sinusoidal interference fringes at the detection plane within the readhead. The optical scheme averages the contributions from many scale graduations and effectively filters out signals not matching the scale period. This ensures signal stability even when the scale is contaminated or slightly damaged.
Low short-term errors are assured by the unique optical design, typically giving less than ±0.15 μm Sub-Divisional Error (SDE). For even lower SDE and even higher signal stability, RG2 series encoders can be connected to either a REE or REE interface where appropriate. These utilise built-in Auto Gain Control (AGC) and Auto Offset Control (AOC) functions that operate at all speeds.
The RG2 series readheads feature a set-up LED, which lights green when optimum installation has been achieved. A reference mark or a single limit is also available.
The reference mark provides a repeatable home or zero position, whilst the limit is used as an end of travel indicator.
** Slide animates the scale and output waveforms together – the presenter should allow several seconds for this to run**
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6. RG2 readhead options Readhead size: 36 x 13.5 x 14.8 mm
Renishaw plc
02/12/2017
RG2 readhead options
RGH20
Readhead size: 36 x 13.5 x 14.8 mm
Linear speed to 8 m/s
Resolutions to 10 nm
0 °C – 55 °C
RGH20F
Super compact readhead: 36 x 13.5 x 10.5 mm
REF interface with DSP as standard
Low SDE < ± 50 nm and resolutions to 5 nm
UHV variant available
0 °C – 55 °C
Please read the notes below:
The RGH20 compact readhead offers reliable, high speed, open, non-contact performance with excellent immunity to dust, scratches and light oils on the scale. The RGH20 also benefits from Renishaw's integral readhead set-up LED which simplifies installation and monitors signal condition during operation.
The RGH20F compact readhead offers reliable, high speed, open, non-contact performance with excellent immunity to dust, scratches and light oils on the scale.
The RGH20F readhead is used with the REF interface, which incorporates automatic gain control and unique self-tuning adaptive electronics. Combined with the readhead's filtering optics, these ensure excellent signal integrity and low Sub-Divisional Error (SDE). The REF interfaces are available with high resolution digital outputs or with industry standard 1 Vpp analogue output.
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7. RG2 readhead options Readhead size: 44 x 27 x 16 mm
Renishaw plc
02/12/2017
RG2 readhead options
RGH22
Readhead size: 44 x 27 x 16 mm
Digital RS422 output direct from head
Optional REE interpolator
Speeds to 10 m/s and resolutions to 50 nm
0 °C – 55 °C
RGH24
Readhead size: 36 x 13.5 x 14.8 mm
Digital RS422 output direct from head
Optional REE interpolator
Speeds to 8 m/s and resolutions to 10 nm
0 °C – 55 °C
Please read the notes below:
The RGH22 readhead offers reliable, high speed, open, non-contact performance with excellent immunity to dust, scratches and light oils on the scale. The RGH22 also benefits from Renishaw's integral readhead set-up LED which simplifies installation and monitors signal condition during operation.
The RGH24 is a compact readhead with integral interpolation which offers industry standard digital and analogue outputs. Its non-contact design offers high speed, reliable operation with zero friction and zero wear.
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8. RG2 readhead options Ultra-high vacuum compatible
Renishaw plc
02/12/2017
RG2 readhead options
RGH25F
Ultra-high vacuum compatible
Super compact readhead: 36 x 13.5 x 10.5 mm
REF interface
Low SDE < ± 50 nm and resolutions to 5 nm
UHV variant available
0 °C – 55 °C
Please read the notes below:
The RGH25F compact readhead offers reliable, high speed, open, non-contact performance with excellent immunity to dust, scratches and light oils on the scale.
The RGH25F readhead is used with the REF interface which incorporates automatic gain control and unique self-tuning adaptive electronics. Combined with filtering optics, these ensure excellent signal integrity and low Sub-Divisional Error (SDE). The REF interfaces are available with high resolution digital outputs or with industry standard 1 Vpp analogue output.
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9. RG2 linear scales Lengths > 50 m Thermally masters to the substrate
Renishaw plc
02/12/2017
RG2 linear scales
RGS tape (RGH 22, 24, 25 and 25F)
Lengths > 50 m
Thermally masters to the substrate
±15 µm / m accuracy at 20 °C
Repeatable reference mark with magnetic actuator
Adhesive mounting
RSLR spar (RGH20 and 20F only)
Lengths to 5 m
±4 µm accuracy over 5 m at 20 °C
Magnetically actuated reference mark
Mounting by adhesive or clips / clamps
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RGS20 is a ribbon scale manufactured from a thin flexible steel strip, featuring a 20 µm pitch, which is gold plated to give high reflectivity and corrosion resistance. It may be mounted using adhesive backing tape, to most engineering materials, including metals, ceramics and composites. Secured to the substrate with scale end-clamps, RGS is mastered to the substrate and will match the substrate's thermal expansion. The scale is supplied on a reel and can be cut to suit any axis length up to 50 m.
RSLR is a stainless steel spar scale featuring 20 µm pitch, which is comparable to fine pitch glass scales and offers a total accuracy (including slope and linearity) better than ±4 µm over a 5 m length. It can also be coiled for simple storage and handling yet once uncoiled behaves as a spar scale.
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.
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10. RG2 rotary scale Low profile scales with standard sizes up to Ø550 mm
Renishaw plc
02/12/2017
RG2 rotary scale
RESR ring (RGH20/RGH20F only)
Low profile scales with standard sizes up to Ø550 mm
Uni-directionally repeatable reference marks with magnetic actuator
Graduation accuracy to ±0.5 arc second (Ø550 ring)
Patented taper mount simplifies integration and eliminates installation errors
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RESR is a one-piece stainless steel ring with 20 µm pitch graduations marked directly on the periphery. Two versions are available in a wide range of sizes (Ø52 mm to Ø550 mm).‘A' section rings, which offer an impressive installed accuracy, feature a taper mount system which reduce the need for highly-toleranced machined parts and eliminate eccentricity. ‘B' section thin rings, which are low inertia and mass, are also available. Both 'A' and 'B' section rings have a large internal diameter for flexible integration. The non-contact format eliminates backlash, shaft wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders.
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11. Any questions? The RG2 Solution Proven track-record over many years
Renishaw plc
02/12/2017
The RG2 Solution
Proven track-record over many years
Wide-variety of readhead variants to suit many applications
20 µm-pitch linear and rotary scales
Ultra-high vacuum capability
Easy set-up and calibration
REE and REF interfaces for enhanced performance
Any questions?
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Any questions? slide
Feel free to amend for your individual presentation; this should summarise your main points (no more than 5-6 total)
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