Traditionally, Holroyd has provided its own, in-house-developed CNC and HMI systems. However, to provide customers with greater levels of choice when specifying their rotor milling centres, the company now also offers both Siemens and Fanuc controllers as standard-fit alternatives to its own CNC.

Holroyd’s proprietary CNC system is partnered with Bosch motors and Bosch Rexroth digital drive systems, while both the Fanuc and Siemens controllers have been engineered as ‘complete systems’, and are supplied with their respective drives and motors. The controls have also been developed alongside a proprietary Holroyd HMI that has been designed to replicate the functionality and simplicity of programming with which users of Holroyd CNCs will be familiar.

Holroyd’s Siemens CNC/HMI option benefits from a large 300 x 525 mm screen and incorporates a user manual as well as all maintenance drawings relevant to the machine in question. Other features include a ‘soft button’ panel that can be ‘swiped’ to reveal further programming options or additional machine information.

Optional CCTV cameras can be specified to assist operators during machine set-up, while newly developed ASUB cycles allow users to select set-up routines that can then be activated through the handheld unit. Twin helical vacuum or hydraulic pump screws can be easily manufactured thanks to auto-positioning of the helical paths. In addition, the newly introduced flow guide style programming allows the operation to start, stop and even omit sections of the program while the machine is in cycle.

In addition to providing a choice of CNC/HMI configurations, Holroyd also offers customers the opportunity to specify its HPMS (Holroyd Profile Management System) with machine orders. Specially developed to simplify the entire helical component manufacturing process, HPMS comprises a specially written family of programs for the analysis and manipulation of profiles. HPMS is used in the development and control of various helical profiles for screw rotors, vacuum and pump screws, and worm gears.