Repeat machine tool orders are often seen as a measure of confidence in a supplier, and one of Japan’s leading manufacturers of compressor air systems has again demonstrated its long-standing trust in
PTG Holroyd Precision. The company has just placed an order for its third PTG Holroyd TG350 helical thread and rotor grinding machine, bringing its total number of Holroyd machines to 14.
Its relationship with the UK manufacturer stretches back to 1956, when it purchased a 2A rotor milling machine, followed by several additional milling and grinding models over the years, including one of Holroyd’s large-capacity 8EX machines capable of milling helical rotors and pump screws up to 850mm in diameter.
Mark Curran, PTG Holroyd Precision sales director, said: “We are delighted to have established such a solid and long-lasting relationship with the company concerned. Our ongoing relationship is testimony to the uncompromising quality of the machine tools we build and the support we provide. Perhaps most impressively, as our Japanese customer has expanded globally, it has stayed loyal to the PTG Holroyd Precision brand, also equipping its new facilities with our machines.”
The latest TG350 grinder will be built at PTG Holroyd Precision’s technology centre in Rochdale during 2026 and is scheduled for shipment in early 2027. Once installed, it will be used to grind screw rotors measuring up to 350mm in diameter x 2,000mm in length, strengthening the customer’s production capabilities and supporting continued expansion.
Setting the industry standardMr Curran said: “Our TG Series thread and rotor grinding machines are widely regarded as setting the industry standard for high speed, high accuracy, efficient stock removal. Advanced control, integrated safety, reporting and security are ensured through the use of Siemens Sinumerik One CNC. Enhanced connectivity is provided via additional PROFINET interfaces, OPC/UA interfaces and increased performance — all made possible thanks to a PLC that is 10-times faster than earlier Siemens controls.”
Designed for prototyping, batch and high-volume work, the TG Series is used primarily for finishing helical screw components, including worm screws and rotors that have undergone rough or semi-finish milling. The range begins with the TG50E for components up to 50mm in diameter and extends to machines capable of handling workpieces of 450mm in diameter, 2,020mm in length and up to 700kg in weight. Automated processes reduce set-up times, and the continuous dressing of diamond discs during semi-finish cycles delivers significant time savings. On‑machine probing provides fully automated compensation without the need for highly skilled operator input, helping to ensure consistent accuracy.
PTG — through its Holroyd Precision, Powerstir Friction Stir Welding and Holroyd Precision Rotors brands — has established itself internationally in the design and manufacture of specialised, high-precision machine tools. Its portfolio covers complex helical components such as compressor rotors, pump screws and high‑accuracy gears, along with Powerstir systems for friction stir welding advanced alloys used in transport applications.
With manufacturing operations in the UK, USA and China, Holroyd Precision Rotors produces ultra‑precision helical components used in sectors such as refrigeration, air conditioning, gas and vacuum pumping, industrial air handling, aerospace, medical engineering, motion control, automotive, oil and gas, and power generation. PTG also provides advanced technical consulting services.