The very nature of screw-pump spindle profiles – and the often-significant difference between spindle length and diameter – presents manufacturers with a unique challenge: that of ensuring zero flexing of the workpiece during grinding. That is why every Holroyd SP Series machine incorporates specially designed workpiece holding technologies to ensure total rigidity and absolute precision throughout the entire grinding process.

Choose from the TG-SP range, with models to accommodate component diameters from 3 mm to 450 mm and component weights of up to 500 kg. Alternatively, for components exceeding 500 kg, we offer the Zenith SP, designed to accommodate maximum component diameters of 420 mm and maximum component weights of 700kg. Just like the Zenith 400 helical profile grinding machine, the Zenith SP also offers all three grinding wheel technologies: dressable aluminium oxide, ultra-hard plated CBN and vitrified, dressable CBN.