How is Metrology Used?

Posted on 28th May 2019

Calibration forms part of this science of measurement and CoMech Metrology enters the fray when it comes to calibrating various metrology equipment types. But how does a piece of equipment get calibrated at CoMech?

How we Calibrate

At CoMech, we use a wide range of calibration equipment types to test a multitude of tools, gauges, devices and more. For example, we use bespoke and specialist calibrators capable of calibrating pressure, voltage, electrical and mechanical specimens.

The correct apparatus while following the guidelines and procedures associated with the laboratory or otherwise must calibrate each piece of equipment that passes through CoMech’s doors.

We have taken the time and care to meticulously and accurately produce official procedures in conformance with the relevant UKAS standards or other standards set by the appropriate bodies. By adhering to these standards and guidelines, we continuously perform the calibrations correctly.

An example of this would be associated with our tailor-made rail and profile gauges we manufacture and supply to the rail industry. We use gauge blocks, a magnetic block and what is called a Shadow Graph, all of which are up to date with their calibrations. The gauge to be calibrated is typically placed onto the gauge blocks and secured into place with a clamp. The gauge needs to be square with the base of the Shadow Graph for the calibration technician to measure the dimensions given. The Shadow Graph is used to compare the profile against the identification gauge measurements tracing with the magnetic block. To pass calibration, the profile must not deviate over the set measurement amount. After the gauge has passed its calibration, a certificate is issued to the customer. If the gauge has failed its calibration, our team contacts the customer to find the best solution going forward.

An example of a Baty Shadow Graph we use for identifying and profiling gauges. To the right is an example of a gauge being measured by a caliper.

Specialist Equipment, Specialist Calibrations

Depending on the nature and properties of the equipment in for calibration, various tools and machines will be required. For instance, our surface tables and length bars are excellent for measuring track grinding gauges. The gauge in question is placed on the surface table with an engineer’s parallel under one end. Gauge blocks are then placed under the other end to help calculate the distance between profiles. Further measurements are then carried out on the gauge plate by using a digital calliper.

There are many types of calibration equipment situated within our laboratories. Our arsenal of equipment is more than capable of calibrating most types of measurement tool or gauge.

CoMech perform both large and small-scale calibrations in-house. No matter the size of the item or job, we will have the right method to perform accordingly. We are proud of the specialist capabilities of our technicians, our electrical, dimensional and mechanical laboratories and the equipment within them. Combined, we believe this makes CoMech the only place to go for calibrations.

For more information about what CoMech can calibrate for you, contact our team on or telephone 01332 867700.

Keep an eye out for future articles from CoMech, where we will be exploring how tensile machines work for calibrations and how traceability is important to metrology.

Did you like this article? Share it!


  • Calibration
  • Innovation
  • Design
  • Supply Chain
  • Technology