Our expertise

Measurement uncertainty describes the quality of a measurement service provider. It covers the factors relevant to measurement – humans, machines and the environment. It can be used to assess the performance of a laboratory for all levels of accuracy. 

Low measurement uncertainty represents high quality and reliability, and is the basis for trustworthy and safe testing and calibration certificates. (see also facts on measurement uncertainty). 

There is no such thing as absolute accuracy. The true value of a characteristic can never be accurately measured or calibrated, even by national institutes. The better the equipment, skills and quality of a laboratory, the closer you come to the true value. Measurement uncertainty shows just how close you are to the true value. The smaller the measurement uncertainty, the more precise the statement. We therefore push ourselves to the limits of what is feasible and measure and calibrate in the sub-micrometre range.

The ISO/IEC 2627 standard classifies measuring rooms. It precisely defines all requirements, such as temperature and humidity, building structure, vibrations, shocks, dust and noise from neighbouring activities. There are six laboratory classes. We have a Class 1 laboratory, which thus meets the most stringent requirements.

You can expect your orders to be carried out with the most suitable accuracy level. Technical as well as cost aspects should be taken into account. Gribi provides you with the level of accuracy that best suits your needs. In short – the best value for money.

The machine accuracy or accuracy of a measuring machine is often erroneously specified as measurement uncertainty. However, this is incorrect. Machine accuracy is only one part of measurement uncertainty. It does not reveal much as an individual value, only in conjunction with all measurement-relevant parameters. Machine accuracy is defined by the machine manufacturer and can only be achieved if the user has at least the same laboratory conditions as the manufacturer.

Precision is when a marksman fires 10 shots and although the strikes are only a few centimetres apart, they are far outside the centre. If all the strikes are located around the centre, this is referred to as accuracy.

The laboratory should be accredited according to ISO/IEC 17025 and have the necessary infrastructure to meet your requirements. Enquire about the smallest possible expanded measurement uncertainty. This must be in relation to your requirements.

See “Influence of measurement uncertainty on the conformity decision for 3D calibrations and tests” (see SAS document No. 216.dw)

All order data is kept for a minimum of 13 years or, if desired by the customer, longer.

A CT scan enables comprehensive component analysis. Hidden deviations, cracks, cavities and other faults can be detected. Within a short time, you will receive all the information you need for an evaluation or correction of your component, a complete ISIR or a series test.

A graphical actual-target comparison for a global evaluation of a component, a complete geometric analysis, a cavity or wall thickness analysis or a function check are all possible. Even hidden or elusive elements can be analysed easily. Whatever you need, our analyses will provide you with all the information you need within a short time.

The size, quality and material density of the part are important for the CT. Almost all materials can be scanned, including steel. All kinds of plastics, as well as those reinforced with glass, titanium, aluminium, organic materials, etc. are very well suited. The maximum scan size is approximately 300 x 300 millimetres.

In principle, yes, if the resolution or the level of detail allows this.

The accuracy of our systems is 3.5 μm+L/100. Our systems are validated according to VDI/VDE 2630 sheet 1.3. The systems are checked periodically with an accuracy measurement standard or reference body.

There is no flat rate or standard. We have two systems providing different
performances and different scanning ranges. We can scan small plastic or titanium parts very quickly. Technical and cost aspects will be taken into account for a quotation and the best possible offer created.

For geometric measurements, the data in the report is summarised in a table. A clear summary of the measured values provides information on the maximum and minimum deviations, the mean value and the range for each characteristic. Graphical evaluations, such as a graphical actual/target comparison, are integrated in the report.

Test reports are archived permanently. As regards project data, you decide on the next steps, as these are often no longer required. Upon request, we will archive your project data for a fee or leave it up to you to archive. If this is not required, the data will be deleted after one month.

Accreditation means the formal recognition of the professional and organisational competence centre to carry out a specific service described in the scope of the accreditation. This is the key to transparency, trust and comparability.

Accreditation according to ISO/IEC 17025 is valid and recognised worldwide in all industrialised countries. You can therefore rest assured that testing tasks and calibrations will be accepted by the vast majority of end users and authorities.

A factory certificate is a measurement and test report that is not created by an accredited laboratory or in an accredited environment. It is not recognised by any authority, certification or accreditation body and is at most suitable for internal use. The measured values are not facts, but rather assumptions, as they have no basis.  

ISO 9001:2015 is the certification standard for management and governs the activities of management and administration. The aim of the standard is to bring companies lasting and sustained success.

Accredited testing and calibration laboratories undertake to work according to international standards. This makes testing and calibration work internationally comparable. Measuring procedures, measurement methods, handling of specimens, reports, etc. must be carried out according to defined and approved procedures and specifications. The conformity of the laboratory is periodically checked and confirmed by the national authority (SAS in Switzerland).

  Accreditation is not a guarantee of accurate measurement. The ISO/IEC 17025 standard does not require a certain level of accuracy. The measurement service provider is completely free to choose the machines used as well as the laboratory environment. If a measurement service provider specifies an accuracy or measurement uncertainty that it is unable to maintain, this is its own responsibility.

We will be happy to assist you further and provide you with an offer free of charge. Send your enquiry by email to: gribi@messtechnik.ch

Send us a drawing indicating which characteristics you need as well as the number of parts. We will then prepare an offer for you with the most suitable level of accuracy.

You can send your parts via all conventional parcel delivery companies (post, DHL, TNT, UPS, etc.) or even deliver them in person. Delivery with a pallet is also possible. The goods receiving department’s opening hours are Monday to Friday, 8 a.m. – 12 p.m. and 1.30 p.m. – 4 p.m.

Your parts will be returned to you in the same way as they came to us – or as agreed.

You will receive all reports and certificates electronically at the desired email addresses. On request, you can also receive the certificates and reports in paper form.

The delivery time varies depending on the order volume. As a rule, this is maximum 14 working days after receipt of the parts.

The delivery time is approximately 10 working days after receipt of the parts. It is possible to define a desired date by prior arrangement.

Our payment terms are 30 days net. We will send the invoice as a PDF to the desired email address.

CT is the abbreviation for industrial computer tomography. This enables non-destructive component analysis.

SAS is the abbreviation for the Swiss Accreditation Service.

Guide to the expression of Uncertainty in Measurement

Swiss Calibration (accredited calibration laboratory)

Swiss Testing (accredited testing laboratory)

Swiss Association for Quality and Management Systems (SQS)

Coordinate-measuring machine