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Measurement of Shafts is Critical in Geometrically Matched Rotor Pairs
01 May 2005
A world leader in the manufacture of helical components, Rochdale-based Holroyd Machine Tools, is using a bespoke measuring bench and fixtures on a project to manufacture 15,000 matched pairs of rotors per annum for the turbocharger units used in marine outboard power motors. Manufacturing tolerances on the shafts of the helical components are in accordance with automotive capability requirements, therefore measurements are taken mid-process, in order to fine tune the geometry of each pair.
Each pair of rotary screws must be exactly geometrically matched in order to mesh together perfectly when in operation. Holroyd measures shaft diameter, length and root depth for each of these very technical components with DataMyte data analysis and capture, supplied and supported by Quality Gauging Systems Ltd (QGS).
QGS manufactured a bespoke measuring bench, incorporating fixtures to hold the components in place. When the item is correctly positioned, the measuring tools, in this case touch sensitive callipers with electronic transducers, are manually moved into place. The selected measurements are then taken and automatically transmitted to the DataMyte software which is running on the bench-top PC, for analysis.
During the whole process the DataMyte software is continuously analysing the new measurement data in the context of the total manufacturing run, and displaying the overall capability factor of the process on screen.
The manufacturing process of these rotors begins with the manufacture of the stainless steel shafts in Canada, from where they are sent to Japan for the aluminium diecast to be added, then on to Holroyd in Rochdale, before being shipped back as finished units to the USA.
www.holroyd.com
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