Röders RHP500

The Röders RHP500 is the only model in the RHP series, and the one Röders machine with hydrostatic guideways. It combines them with linear motors in the linear axes, which the maker says gives very smooth running with minimal friction. The machining range is 500 mm x 552 mm x 300 mm (19.7 x 21.7 x 11.8 in).

Röders is unusually frank about where this machine belongs. It recommends the RHP500 for specialised applications requiring sub-micrometre tolerances, and says such machines are still manufactured because specific applications call for them. The example it gives is sub-micrometre roundness in small bores, produced by grinding. For most other precision work the maker itself points to its RPT models.

Two practical conditions follow from the design. The machine is suitable for all materials except dusty ones like graphite, so electrode work is out. And the preferred lubricant is temperature-controlled flushing oil, which means an oil system and its temperature control are part of the installation.

The table is 600 mm x 540 mm (23.6 x 21.3 in) and takes 400 kg (882 lb). The standard spindle runs at 42,000 rpm with 14 kW (18.8 hp) on HSK E40, for tools up to 16 mm. A chain changer with 42 places can be loaded during machining and has an integrated tool measuring laser. Maximum height is 455 mm (17.9 in) between spindle nose and machine table. At about 10.0 t on W 3,015 mm x L 2,510 mm x H 2,750 mm, it is heavier than the RPT600, which has a similar table.