PTG Holroyd to showcase technologies at CIMT 2025

Rochdale-based PTG Holroyd Precision, a manufacturer of ultra-precise helical rotor and gear milling and grinding machines, will be showcasing its machine tool technologies at CIMT 2025 – the 19th China International Machine Tool Show (Stand E1-A011), taking place 21-26 April in Beijing.

CIMT is widely seen as the largest, most influential professional machine tool exhibition in China, and visitors looking to produce some of the world’s most accurate helical components will be able to find out more about PTG Holroyd Precision’s gear, rotor, screw and thread milling and grinding machines.

Mark Curran, PTG Holroyd’s sales director, said: “PTG Holroyd Precision machine tools are already widely used by Chinese refrigeration and air compressor manufacturers. This is largely due to their uncompromising levels of accuracy and reliability, as well as innovative features that make them exceptionally efficient to use.

“At CIMT 2025, we look forward to showcasing the latest models to join our machine tool line-up. These include our newly launched HG500, a machine that is quite possibly the world’s most versatile, large capacity helical profile grinder; our HG350-WG worm and gear grinding centre – and our recently upgraded TG Series of thread grinding machines. Visitors to our stand will also be able to find out more about other recent machine tool innovations from PTG Holroyd Precision, such as our dual-capability roots-type blower and helical rotor milling machines.”

The clear focus of the show for PTG Holroyd Precision will be to showcase its newly launched HG500 model – a machine developed to meet the needs of manufacturers with diverse production requirements. Able to accommodate the largest, most energy-efficient helical profiles, the HG500 will rough- and finish-grind rotors of as little as 50mm in diameter, right up to a maximum 510mm in diameter, 130mm profile depth and 1,500kg in weight.

Maximum flexibility
In standard form, the HG500 can use either a 500mm vitrified dressable aluminium oxide grinding wheel for maximum flexibility in production strategies and product development, or use plated CBN roughing and finishing wheels for cost-effective volume production. Alternatively, for manufacturers who precision-grind the largest of helical components, a 600mm vitrified dressable aluminium oxide grinding wheel option is available for maximum wheel life.

Another PTG Holroyd Precision machine that is expected to generate considerable interest at CIMT 2025 is the company’s 4EX-R-BL roots-type blower and helical rotor milling machine. Newly updated, this dual-capability model now features a totally redesigned machine bed and worktable to enable components of up to 450mm in diameter to be milled. Both the bed length and bed width have also been increased to give greater support against increased cutter forces.

While further supporting the machine’s greater milling capability (the original 4EX could produce parts of up to 420mm in diameter), the machine bed height has been lowered by 150mm, with additional buttress supports providing increased stability during flute milling on what was already an incredibly robust and steady machine. The maximum cutter width has been increased from 320 to 400mm to accommodate particularly large rotor profiles, with Holroyd’s HSK 160 cutter spindle interface providing additional cutter rigidity.

Mr Curran concluded: “We have a great deal to showcase to visitors at CIMT 2025. The PTG Holroyd Precision name has long been a benchmark for superior milling and grinding technologies among screw compressor and rotor manufacturers and we look forward to displaying our very latest British-built innovations in Beijing.”