Holroyd PrecisionHolroyd Precision says its has developed a new CNC profile milling machine that, in addition to producing helical rotors, can be programmed to precision mill straight fluted components as used in Roots-type blower ‘air ends’.

The company says the 4EX-R-BL machine has been designed from the ground up and that as well as being equipped to mill helical rotors of up to 450mm in diameter, it will rough mill blower blanks of around 320mm in diameter and 900mm body length into straight fluted rotors in 30 minutes floor-to-floor, ready for finish profile milling to absolute size. It features a bespoke steadying system that the company claims has been designed to withstand the additional forces that are generated during the milling of straight flutes.