RG2 and RG4 are the most commonly used Renishaw gratings, providing highly reliable position feedback even under conditions where most open linear gratings are not suitable.

RG2 is an open non-contact linear grating system that can eliminate friction and wear, ensuring reliable high-speed and high-resolution motion. RG2 has a unique 20 µ m grid spacing, ensuring excellent signal stability even under conditions where most open linear gratings are not suitable. The RG2 reading head series includes RGH22, small RGH24, and ultra small RGH25. These three reading heads all have optical filtering systems that can read gold-plated steel strip rulers with a grid spacing of 20 µ m and a resolution of 5 nm. Many of the world's leading linear motion original manufacturers install these products as standard configurations. In addition, these products are widely used in medical, machine tool PV、 Semiconductor and FPD manufacturing fields.

option
Provide a 20 µ m analog signal cycle or a digital signal resolution ranging from 5 µ m to 5 nm. All RG2 linear grating systems are equipped with unique integrated LED installation indicator lights, which turn green if installed correctly. All models of reading heads have reference zero and/or limit switches. The reference zero position provides a repeatable starting position or zero point, while the limit switch indicates the end point of the travel. RGH22 has a dual limit switch option, providing separate signal outputs at both ends of the stroke.

technology
Infrared light-emitting diodes emit light onto the engraved surface of the grating ruler, and then reflect the light back into the reading head through a transparent indicator grating engraved surface. This creates sine interference fringes on the detection surface of the reading head. This optical system adopts the technique of evenly dividing many stripes, effectively filtering out signals that do not match the grating ruler's engraving period. Even in the case of contamination or minor damage to the grating ruler, signal stability can be ensured.

The thermal expansion characteristics are often an important factor determining the overall measurement accuracy. The RGS20-S steel strip ruler is fastened at the end, forcing its expansion characteristics to be consistent with those of the base material, without the need to compensate for different expansion coefficients.

The unique optical design ensures very small short cycle errors, with cycle errors (i.e. electronic subdivision errors) typically less than ± 0.15 µ m. The linear error characteristic is every 60 mm ± 0.75 µ m, or any ± 3 µ m per meter.

RG2 has a reliable and durable grating ruler, excellent measurement performance, and can be cut to any length according to user needs. The surface of RGS20-S gold-plated steel strip grating ruler is painted, unlike traditional grating rulers that require careful operation and cleaning. The back comes with self-adhesive, making installation simple and fast; There are different installation tools to choose from for various models of reading heads. Stick the reference zero position, limit switch, and terminal pressure block to the corresponding positions to complete the installation.

Characteristics and advantages of RGH22 reading head

The open, non-contact RGH22 reading head is equipped with Renishaw's unique and flexible 20 µ m RGS20-S steel strip ruler, with a resolution of 10 nm. RGH24 has a lightweight structure, making it very suitable for applications in micro gimbal, magnetic excitation block, and other space limited situations. The surface painted grid ruler is easy to clean and durable
The reading head is compact and sturdy, with built-in subdivision circuits that can provide industry standard analog and digital outputs
Non contact design provides high-speed, reliable operation with zero friction and wear
Built in LED installation indicator light makes the reading head easy to install
Optical filtering systems still exhibit excellent signal stability under conditions where most open gratings are not suitable
The reference zero position provides a repeatable starting position, while the limit switch indicates the end point of the shaft travel

RGS20-S 20 µ m spacing steel strip ruler

The 20 µ m RGS20-S is made of thin flexible steel strip; Steel strips coated with gold have higher reflectivity and corrosion resistance. It can be installed on most engineering materials such as metal, ceramic, and synthetic materials using the adhesive tape that comes with the back.
The grid ruler is supplied in rolls, and users can cut it according to their needs, which can meet the shaft length requirements of up to 70 meters
The expansion characteristics of RGS-S grating ruler are consistent with those of the substrate material (and grating ruler adhesive), simplifying the thermal compensation of the system
Installation tools help to quickly and accurately install grid rulers

• Can be easily cut to the desired length, ensuring unnecessary waste and efficient inventory management
± 3 µ m/m linearity can achieve high accuracy through simple compensation

Characteristics and advantages of RGH24 reading head
The ultra small reading head comes with a built-in subdivision circuit, which can provide industrial standard analog and digital outputs
Non contact design provides high-speed, reliable operation with zero friction and wear
Built in LED installation indicator light makes the reading head easy to install
Optical filtering systems still exhibit excellent signal stability under conditions where most open gratings are not suitable
The reference zero position provides a repeatable starting position, while the limit switch indicates the end point of the shaft travel
Can be used in conjunction with various connector options, including 10 pin JST connectors, for easy integration

RG4 is an open non-contact linear grating system that can eliminate friction and wear, ensuring reliable high-speed and high-resolution motion. RG2 has a unique 20 µ m grid spacing, ensuring excellent signal stability even under conditions where most open linear gratings are not suitable.

The RG4 open non-contact linear grating system can eliminate friction and wear, ensuring reliable high-speed and high-resolution motion. The 40 µ m grid spacing enables the grid ruler to have higher working speed and looser installation tolerances. In addition, the RG4 system is capable of reading more types of grid scales.

option

The RG4 linear grating reading head provides a 40 µ m analog signal period or a digital signal resolution from 10 µ m to 50 nm. RGH34 is an ultra small reading head, while RGH40 and RGH41 are fully encapsulated reading heads. All systems are equipped with unique integrated LED installation indicator lights, which turn green if installed correctly. All models of reading heads have reference zero and/or limit switches, and RGH40 and RGH41 have dual limit switches. The reference zero position provides a repeatable starting position or zero point, while the limit switch indicates the end point of the travel.

technology
Infrared light-emitting diodes emit light onto the engraved surface of the grating ruler, and then reflect the light back into the reading head through a transparent indicator grating engraved surface. This creates sine interference fringes on the detection surface of the reading head. The optical principle used in RG4 is basically the same as that of RG2, except that the light emitted by the infrared light-emitting diode is reflected at a 90 ° angle to the grating scale direction, rather than parallel reflection. This optical system adopts the technique of evenly dividing many stripes, effectively filtering out signals that do not match the grating ruler's engraving period. Even in the case of contamination or minor damage to the grating ruler, signal stability can be ensured.

The working principle of RG4 series grating allows the use of multiple types of grating rulers. RGH41 and RGH34 reading heads are compatible with RGS40-S steel strip ruler. The grid ruler can be cut according to user needs, and its expansion characteristics are consistent with those of the base material. When painting and cleaning the surface of the grating ruler, there is no need to be as careful as operating a traditional grating ruler; The back of the grating ruler comes with adhesive tape, making installation simple and fast. The unique optical design ensures very small short cycle errors, with cycle errors (i.e. electronic subdivision errors) typically less than ± 0.25 µ m. The linear error characteristic of RGS40-S grating ruler is only 1 µ m per 60 mm, and the accuracy is better than ± 3 µ m at any length.

RGH40 and RGH34 reading heads are compatible with RGS40-G chromium alloy glass grating ruler, with a length of up to 1 meter. RGS40-G is an ideal choice for applications where the grid ruler can be directly installed onto the substrate using only the reference fixture and mechanical fixture, or the adhesive tape provided on the back. RGH40 and RGH34 are also paired with 40 µ m RESR circular gratings, and the multifunctional RG4 reading head can be used on customized reflective engraving gratings for OEM professional applications.

Characteristics and advantages of RGH40 RGH41 reading head

The open, non-contact RGH40 reading head is designed specifically for use with Renishaw's 40 µ mRGS40-G glass grating ruler or 40 µ m RESR circular grating used in combinationAnd designed with a resolution of 50 nm
The open, non-contact RGH41 reading head is equipped with Renishaw's unique and flexibleRGS40-S 40 µ m spacing steel strip rulerIt has a resolution of 50 nm.

The reading head is compact and sturdy, with built-in subdivision circuits that can provide industry standard analog and digital outputs
• Provide high-speed, reliable operation with zero friction and wear
The grid ruler with a spacing of 40 µ m provides a loose installation tolerance for the reading head
Integrated LED installation indicator lights simplify the installation process
The patented optical filtering system maintains excellent signal stability even under conditions where most open gratings are not suitable
The reference zero position provides a repeatable starting position, while the limit switch indicates the end point of the shaft travel
RGH40 reads 40 µ m RGS40-G glass grating ruler, 40 µ m RESR circular grating, and industry standard 40 µ m glass grating ruler readings

Characteristics and advantages of RGH34 system
Open, non-contact RGH34 grating is a universal micro component system. RGH34 is designed specifically for original equipment manufacturer (OEM) applications, and traditional enclosed reading heads are not suitable for these applications. It brings reliable performance to compact precision linear magnetic blocks, microscopes, and micro gimbals.
Characteristics and advantages of RGH34 system
• Can be integrated into a range of microsystems
• Provide high-speed, reliable operation with zero friction and wear
The RGI34 interface processes signals from the RGH34 reading head into industrial standard digital and analog outputs
Low quality (<2 grams) greatly reduces the inertia of the system
The grid ruler with a spacing of 40 µ m provides a loose installation tolerance for the reading head
LED installation indicator light (on RGI34 interface) simplifies the installation process
The patented optical filtering system maintains excellent signal stability even under conditions where most open gratings are not suitable
The optical zero position provides a repeatable starting position, while the limit switch indicates the end point of the axis travel
RGH34 reads 40 µ m RGS40-S steel grating ruler, 40 µ m RGS40-G glass grating ruler, 40 µ m RESR circular grating, and industrial standard 40 µ m glass grating ruler

High precision, excellent measurement effect, and easy integration.

The Renishaw circular grating series includes two types: absolute and incremental, with an accuracy of ± 1 arcsecond, a resolution of 0.00075 arcseconds, and a speed of up to 36000 revolutions per minute.

Renishaw's absolute and incremental circular gratings are designed for rotating applications that require long-term reliability and high dynamic performance. They are lightweight, have a large inner diameter, and can be easily fitted onto large-diameter shafts to meet their payload or servo drive requirements. We can provide customized sizes or larger diameter circular gratings according to customer requirements.

Stainless steel circular grating has high-precision calibration, and its unique conical installation method corrects the eccentricity or diameter tolerance of the rotating shaft/axis. Customers can choose optical reference zero position or magnetic excitation body fastened with bolts. These circular gratings are compatible with various reading heads and are suitable for applications that require good resistance to adverse effects such as mechanical vibration and thermal shock.
• RESR is compatible with RGH20, RGH34, RGH35, and RGH40 reading heads. Available in two pitch sizes of 40 µ m and 20 µ m, with diameters ranging from Ø 52 mm to Ø 550 mm

RESM and SiGNUM ™ And TONiC ™ Reading head compatible, with a grid spacing of 20 µ m and a diameter range from Ø 52 mm to Ø 550 mm

RESA is related to RESOLUTE ™ Absolute circular grating compatible with reading head, with a pitch of 30 µ m and a diameter range from Ø 52 mm to Ø 550 mm

REXM and REXA are ultra-high precision versions of RESM and RESA circular gratings, respectively, with higher performance and an overall installation accuracy of ± 1 arcsecond when paired with dual reading heads

New ATOM ™ The micro grating also offers a range of RCDM glass encoders with diameters ranging from Ø 17 mm to Ø 108 mm, available in either 40 µ m or 20 µ m pitch types.

Due to its simple and compact size, all circular gratings have very low rotational inertia, ensuring that no matter where they are installed, the system positioning can achieve minimum torque and maximum speed.

RESR circular grating

Renishaw RESR circular gratings have excellent performance. RESR has a engraving accuracy of ± 0.5 arcseconds and a resolution of 0.004 arcseconds, making it suitable for measurement applications with extremely high precision requirements

RESR circular grating is an integrated stainless steel circular grating that directly engraves lines on a cylindrical surface. The 20 µ m grid spacing RESR is compatible with RGH20 and RGH35 reading heads, while the 40 µ m grid spacing RESR is compatible with RGH34 and RGH40 reading heads.
The engraving accuracy reaches ± 0.5 arc seconds, and the system repeatability reaches 0.004 arc seconds
• Provides multiple diameters and line numbers, compatible with a range of industry standard controllers (diameters from 52 mm to 550 mm, line numbers from 4096 to 86400)
The patented conical installation method greatly reduces installation errors and simplifies system integration
10mm x 10mm small section circular grating
Low quality and low moment of inertia design enhances dynamic performance
The integrated stainless steel circular grating can resist vibration, mechanical and thermal impacts, as well as thermal loads
To ensure higher acceleration and deceleration as well as faster recovery time, a "B" section circular grating with extremely low rotation can also be provided
The reference zero position (with a repeatable starting position) is provided by a separate excitation block

System accuracy -20 µ m grid spacing RESR and RGH20