Hello good people, I'm a junior engineer currently studying in an Adv.Diploma in Mechanical Engineering. I have been tasked with the project of designing a gearbox and I'm having a bit of difficulty getting started as I'm not that experienced with gears. The client requires a 25:1 reduction from 1500rpm to 60rpm with a power throughput of 25kW I am required to design all aspects of the gearbox including that strength of material is ensured. The motor I have found has a shaft diameter of 48mm The design I proposed is a two stage reduction gear box using spur gears. This will use 2 pairs of 20 teeth gears and 100 teeth gears on parallel shafts. I'm consider using helical gears instead or rather than that, opt for a worm drive but I can't seem to find the relevant standards (Australian) or design guide to assist me concerning this. Is there a procedure anyone could suggest I follow? Any information will be much appreciated.