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Coronavirus epidemic update

In response to the virus epidemic our company has decided upon arrangements which will enable us to continue our manufacturing activities and UKAS calibration activities at a reduced scale. Clearly the arrangements must be constantly reviewed in the light of government regulations and scientific advice, and we shall post any alterations to these arrangements on this website.

During these difficult times, we respectfully ask our customers:
1. to contact us by email and not by telephone as far as possible;
2. to understand that delivery dates will be unpredictable, and waiting times longer than normal.

Welcome to Rubert & Co Ltd.  We are world leaders in the design and manufacture of surface texture specimens and calibration standards and are UKAS accredited. Our factory and head office is located in beautiful surroundings in Cheadle near Manchester, in the UK.

Our products fall into two classes. There are first, comparison specimens, which are samples of surfaces produced by conventional machine tools, and are used for surface roughness control at every stage  during the manufacturing process – from design, through machining, assembly, testing, and quality control, whether in a workshop environment, on site, or in offices. Secondly, we produce precision reference specimens which are used to check and calibrate surface measuring instruments. This class includes specimens for 2D measuring systems such as contacting stylus instruments, and also specimens for 3D areal surface topography systems (3D areal specimens.)

In fact, we produce the world’s largest range of surface specimens offered by a single manufacturer.

All of our specimens are made using the method of nickel electroforming, which is a replicative technique exceptionally well suited to the manufacture of surface roughness specimens, since it reproduces small surface features with great fidelity.

Comparison Specimens

The measurement of surface roughness is not as straightforward as most other engineering measurements, such as length or angle or hardness; and in order to get good accuracy, expensive instruments are needed. These are often unsuitable for workshop use, where roughness of machined surfaces can usually be assessed conveniently and with sufficient reliability by means of visual and tactile (fingernail) comparison of a workpiece with a standard set of surfaces machined in the same way.

Such sets of surfaces are called roughness comparison specimens. They are simple to use, inexpensive, and hence widely used in many different applications. For our full range see Comparison Specimens.

Precision Reference Specimens

If more precise measurements of surface roughness are needed, then a more sophisticated instrument than a fingernail must be used.  Many different types of instrument are available, ranging from inexpensive workshop roughness testers to sophisticated computerised laboratory systems; and making use of different technologies for the pickup or transducer responsible for generating an electrical signal representative of the surface, such as atomic force probes or laser beams, as well as the more widely-used contacting diamond stylus method. Whichever type of instrument is used, however, it will have to be calibrated and checked before use, by means of standard reference specimens, often called calibration standards or material measures.  For our full range of these see Reference Specimens.

3D Areal Calibration

Our 3D areal calibration specimens include 8 physical material measures (calibration artefacts) and allows users to calibrate the important metrological characteristics of areal surface topography measuring instruments. These 3D instruments are specified in the ISO 25178 family of standards documents, currently being developed at ISO.

The specimens enable users to adopt good measurement practice, and will help users to correlate measurements of surface texture made by non-contacting optical instruments with those made by 2D contacting stylus instruments. For our full range of these see 3D calibration.