hydraulic, electric and air driven rotary dressing apparatus; dressing tools for grinding wheels; dressing tools for peripheral dressing of plunge grinding wheels; dressing tools for end cutter dressing of internal grinders and camshaft grinders; dressing tools for CNC profile dressing; dressing tools for dressing of centreless grinders, plain 90 degree plunge grinders, angular slide grinders, micro-centric grinders, chucking grinders, universal grinders, internal grinders, surface grinders, crankshaft grinders, camshaft grinders, valve grinders, thread and groove grinders, dual wheel grinders, rotary surface grinders, gear grinders; motor controlled spindles for all these dressing tools; motors for spindles for these dressing tools; single point diamond turners; diamond cutters; servo motors and stepping motors; hydraulic, pneumatic or electric spindles for use in dressing tools; mandrel assemblies for dressing tools; direct drive shafts for rotary spindles being parts of dressing tools; and bearings being parts of spindles for use in dressing tools

electrical and electronic apparatus for controlling the movement of dressing tools and of grinding tools; electrical and electronic power packs to provide closed loop independent power to the motor of a spindle for a dressing tool; electric control apparatus for dressing tools; electrical and electronic programmable controllers for controlling the operation of dressing tools or for incorporation in controls for grinding tools; hydraulic power packs for driving hydraulically powered dressing tools; electrical and electronic flow switches, for incorporation in hydraulic circuits for moving spindles of dressing tools; control apparatus for dressing tools, comprised of display panels, keyboards, switches and auto buttons, and hand-held keyboards