Research findings described in a new article by University of Huddersfield scientists will enable engineering firms to make major gains in productivity and efficiency by reducing the often considerable time lag between the manufacture of components and checking their precision on a CMM.

To ensure complete accuracy, CMMs are housed in a strictly temperature-controlled environment. However, manufacturing processes often lead to big increases or decreases in the temperature of components. Until they are stabilised, they cannot be checked.
‘Temperature soaking’ is the term for this scenario, and a play-safe attitude means that larger components can be set aside for as long as 24 hours, causing a log jam in production, with costly CMMs standing idle.
At the University of Huddersfield’s School of Computing and Engineering, however, a research project headed by Dr Naeem Mian has comprised a series of experiments that provide engineering firms with a technique for calculating how long it takes for a component’s temperature to be stabilised so that it can safely be measured on a CMM.
It has been found that the waiting times can be considerably lower that generally thought – potentially a reduction of many hours. For example, Mian and his team carried out various experiments with a heated venturi – a component used in the oil and gas industry – and discovered that the time required for temperature soaking, so that it could be placed on a CMM, was as low as 7.6 minutes.
Findings from the range of experiments, including the mathematical formulae that will aid manufacturers seeking to calculate temperature soaking periods, are given in the new article, which is titled ‘Reducing the latency between machining and measurement using FEA to predict thermal transient effects on CMM measurement’.
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Rather than acquiring manufacturing plant on a piecemeal basis, the practice of companies purchasing and using machine tools of various categories from single, preferred vendors is now firmly established.

A case in point can be seen at Glenrothes-based A&D Precision Engineering. Engineering quality manager Harry Fernando explains: “In addition to reaping the benefits of favouring the products of certain manufacturers in each of the machine-tool categories we use, we have extended this way of working across all of our quality and inspection endeavours. As we consider that a component is not made until it is inspected, it makes sense that we treat quality and inspection as integral parts of our production processes.
“In the company’s early days we used metrology equipment from several sources,” he continues. “However, the reliability, accuracy and repeatability of our first Mitutoyo products and the excellent service we received from the company, meant that as the company grew, and our older metrology equipment needed to be replaced, we invariably invested in further Mitutoyo products. This has resulted in our measuring system inventory now consisting of 99% Mitutoyo equipment.
“We now use examples of Mitutoyo technology in all of our measurement and testing areas, from digital hand tools, through height gauges, vision equipment and surface roughness testing, to quality department and shop floor-based CMMs.”
Just as A&D Precision Engineering uses premium quality machine tools that deliver high levels of accuracy and productivity, the company’s management expect the same levels of precision and efficiency from its inspection equipment. These critical requirements are reflected in the company’s latest Mitutoyo acquisition, a Crysta-Apex S CNC CMM.
“Following a trouble-free installation, the Crysta-Apex S is now delivering the promised levels of speed and accuracy,” concludes Fernando.
For further information www.mitutoyo.co.uk