Toyoda G7 cylindrical grinder combines operational flexibility with heavy part capability

The highest capacity model in the four model range offers 660 mm over-table swing and up to 4,000 mm between centres cater for large parts weighing up to 1,500 kg. Single plunge capability is provided by the up to 300 mm maximum wheel width. The wheelhead powered by a 22 kW motor offers 45 m/sec or, optionally for high speed grinding, there is 60 m/sec drive system. Accuracy, metal removal performance, absorption of high grinding forces and vibration damping all come thanks to the Toyoda STAT hybrid bearing in the wheelhead, says distributor 2D CNC Machinery. This bearing design combines both hydrostatic and hydrodynamic technology to maintain a greater spindle stability than can be achieved through conventional bearing machine arrangements. When at rest, the hydrostatic pressure centralises the spindle in the bearing thus eliminating any metal-to-metal contact. Once the spindle is rotated, this configuration dampens any vibration and immediately enhances the rigidity of the set up. The full mould-created X-type rib structure of the hand-scraped bed also maximises the stability of the base machine to make a durable, high precision, high process capability grinding platform, says UK agent 2D CNC Machinery. Wheel sizes can be specified up to 1,065 mm diameter with optional automatic wheel crowning cycles for traverse grinding through a 2-axis CNC function. The CNC automatically calculates the data for the curve and initiates the cycle. It then measures the resulting crown and automatically corrects any profile data requirements. Both workhead and tailstock, which are able to accommodate workpieces up to 1,500 kg in weight, have pneumatic cushioning to aid setting and positioning.