±10, ±5, ±3 µm/m arc length
accuracy grades

The WMR-100 stainless steel measuring ring consists of 3 individual rings including a solid carrier ring, a precision graduation ring with 1000um pitch and a cover ring. It is to be stretched onto a properly sized mounting surface by the installer. The mounting surface is typically steel with a CTE ~12 ppm/DegC but can be other materials with operation limited to a narrow temperature range. These measuring rings are only 0.65mm thick and are available in hundreds of existing sizes and can be provided in additional sizes as requested.

The WMR-300 stainless steel measuring ring is supplied in the same way and offers a 3000um pitch grating with ± 20 µm, ± 10 µm or ± 5 µm arc length accuracy grades.

±10, ±5, ±3 µm/m arc length
accuracy grades

The WMF-100/WMF-1050 measuring flange is a stainless steel disk with either a 500um pitch or a 1000um pitch measuring ring installed by AMO. The dimensions of standard flanges are detailed within the catalog. The precision ID of these is easily adapted to alternate shaft sizes. Custom flanges, manufactured to the purchaser’s drawing, can be furnished when standard flanges will not work.

The WMF-300 measuring flange is supplied in the same way and offers a 3000µm grating pitch with +/-20 µm +/-10µm and 5µm  arc length accuracy.

IP-67 Rated

The WMK-200/2050 and WMKF-200/2050 head is an open non-contact design with integrated signal conditioning electronics for outside scanning. 1VPP sine/cosine or TTL (RS 422) square wave output. High speed, high resolution, single count repeatability – suitable for dynamic closed loop motion control. Can be ATEX certified for for explosion sensitive areas. To be mated with WMR-100 measuring rings or WMF-100/1050 measuring flanges.

IP – 67 Rated

The WMK-100/1050 miniature scanning head is an open non-contact design for use in restricted space applications for outside scanning. The miniature sensor housing is separate from the signal conditioning electronics located in the termination connector. High speed, high resolution, single count repeatability – suitable for dynamic closed loop motion control. To be mated with WMR-100 measuring rings or WMF-100/1050 measuring flanges.

±10, ±5, ±3 µm/m arc length
accuracy grades

The WMR-110 stainless steel measuring ring consists of 2 individual rings including a solid carrier ring and a precision graduation ring with a 1000 um pitch. It is to be snapped into a properly sized mounting groove by the installer. The mounting groove is typically steel with a CTE ~12 ppm/DegC but can be other materials with operation limited to a narrow temperature range. These measuring rings are only 0.60 mm thick and are available in dozens of existing sizes and can be provided in additional sizes as requested.

The WMR-310 stainless steel measuring ring is supplied in the same way and offers a 3000 um pitch with ± 20 µm, ± 10 µm or ± 5 µm arc length accuracy grades.

IP – 67 Rated

The WMK-210/2150 and WMKF-210/2150 head is an open non-contact design with integrated signal conditioning electronics for inside scanning. 1VPP sine/cosine or TTL (RS 422) square wave output. High speed, high resolution, single count repeatability – suitable for dynamic closed loop motion control. Can be ATEX certified for explosion sensitive areas. To be mated with WMR-110 measuring rings or WMF-110/1150 measuring flanges.

IP-67 Rated

The WMK-110/1150 miniature scanning head is an open non-contact design for use in restricted space applications for inside scanning. The miniature sensor housing is separate from the signal conditioning electronics located in the termination connector. High speed, high resolution, single count repeatability – suitable for dynamic closed loop motion control. To be mated with WMR-110 measuring rings or WMF-110/1150 measuring flanges.

Multiple Scanning Head System

The MHS, Multiple Head Angle Measuring System, electronics combines the input from 2 permanently installed read heads to eliminate errors of eccentricity and decrease errors from all other sources in high accuracy angular motion systems. It automatically compensates for non-repeating eccentricity errors resulting from ball bearing migration, transient gravity loading and unequal mass loading of rotating systems. It is superior to error mapping because it dynamically compensates for non-repeating errors to deliver high accuracy position feedback and requires no calibration routine. Can be used for partial angle and 360° motion.

Calibrated Scanning Head System

The CHS, Calibrated Head Angle Measuring System, electronics provides a means to error map the angular encoder in high accuracy angular motion systems. After temporarily mounting/connecting a second read head (at 180° or at 180°/90°/270°) the installer rotates the system through the reference index mark. The CHS geometrically eliminates the errors of repeating eccentricity and eliminates 50-75% of the remaining errors depending on the number of temporary read head locations selected. The CHS will permanently store the error map and recall it after both power-up and sufficient motion to cross the reference index mark. Requires 360° motion.

Incremental Angle Catalog

To view the product catalog, please click on the link below or right-click and save the file for future reference:

Incremental Angle Product Catalog.

The AMOSIN® incremental angle measuring systems consist of a stainless steel inductive Grating Ring and a matching non-contact electronic Reader Head. The grating ring size corresponds with the number of whole pitches contained within its circumference. The smallest diameter is approximately 55mm and there is no limit to the maximum diameter. The thin stainless steel ring is ideal for encoding large diameters because it adds little to the mechanical inertia and aids in maximizing the useable bore space. With an IP-67 rating and tolerance to many industrial contaminants (grease, oil, coolant, dust and dirt for example) these mechanical advantages can be employed in both clean and polluted environments.

The AMOSIN incremental angle measuring systems deliver high performance position feedback that is suitable for closed loop motion control either as the primary encoder (direct drive motor) or as the secondary encoder. They are of value in general for drives where high dynamic range and stiffness is required. The environmental attributes of the AMOSIN design are similar to that of magnetic encoders, but these are not magnetic. Neither the grating ring nor the reading head nor are harmed by direct contact to a magnet. Unlike magnetic encoders they can operate in close proximity to direct drive motors and exhibit no hysteresis (backlash) of motion.

The Grating Rings are constructed using a photolithographically patterned and precision etched stainless steel linear scale that is formed into a circle and precisely welded so as to exhibit no discernible error at the weld joint. The high accuracy of the linear scale material enables production of grating rings with low angular error – better than 5 arc seconds is possible for diameters larger than 250mm. A grating ring can be made with any whole number of grating pitches. This makes possible a large number of different sizes, with diameter increments of 0.159mm (500 um pitch), 0.318mm (1000 um pitch) and 0.955mm (3000 um pitch), to closely match tight design requirements. The grating ring is easily stretched onto a customer-provided mounting surface with the proper diameter, stop edge and undercut features. Standard and customer designed flanges can also be provided by AMO to fix the grating ring to the rotating shaft.

The Reading Head inductive electronics, when in close proximity to the matching grating ring, develops high-quality sine and cosine waves with little harmonic distortion and ZERO hysteresis. As a 1VPP sine/cosine output signal to the control, the signal period can be 1:1 to the pitch count or through signal subdividing it can be as high as 32:1 to the pitch count. This capability enables matching the period count to a desired Periods Per Revolution at the control. It also makes possible higher control resolution when the input signal subdividing level is limited. The reading head can also deliver +5V TTL RS422 square wave signals with high resolution to the control.

Typical incremental angle measuring system applications include:

Direct drive torque motors
Rotary tables
C-axis and 4th/5th axes on machine tools
Printing machines
Sheet metal cutting, punching and stamping machines
Medical equipment – Large format scanning and therapy machines
Radar antennas