the entry level machine (xr 1500) has a 10,000rpm, 30kw (40.2hp) 40 taper skf belt-driven spindle. faster spindle speeds are available on the more advanced (xr 1500 hp) model which provides users with 15,000rpm from its 3......the entry level machine (xr 1500) has a 10,000rpm, 30kw (40.2hp) 40 taper skf belt-driven spindle. faster spindle speeds are available on the more advanced (xr 1500 hp) model which provides users with 15,000rpm from its 30kw (40.2hp) 40 taper skf directly-driven spindle. and the last model in the range is the xr 1500 hpd - a real powerhouse of a machine - that comes with a zf two-speed gearbox and achieves 7,500rpm and 764nm torque (557ft-lb)from its 30kw (40.2hp) 50 taper skf belt-driven spindle. all spindles are specified with face and taper capability.