I need to design and find suitable specifications for spur gears for a two stage reduction gearbox. The gearbox has to transmit 5kW at an output rotational speed of approximately 125 rev/min. The gearbox will be driven by a separate mains 4 pole synchronous electric motor . The required service intervals of the gearbox must be around 10,000 hours of continuous operation. Gearbox must be self contained and should have means of bolting to a baseplate. External lubrication is required. Any help with the spur gears specification and sizing requirements?