I need to design a planet carrier for a planetary gearbox to which I'm gonna be doing some simple vibration experiments. It basically consists of the ring, sun and 3 planets and the ring it's no more than 20cm diameter. I've seen many types of designs for planet carriers surfing the web, mainly star type or triangle. I only need the carriers to keep the planets in place but eventually I will need it as the input or the output, so a shaft is needed.
Also, I don't know what kind of bearings I should use on each end of the carrier for the shaft that will go into the planet gears. I'm not a mechanical designer so I don't know about the tolerances either. I was thinking of just measuring the inner diameter of the planets, and design a small shaft to fit very tightly into the gear and the bearing, and have the bearing fit into a bore in the carrier by pressure also, but I don't know if that's also the correct design to go with. I will send everything to be manufactured so I won't have opportunity to mend any mistakes.
Sun = 32 teeth (1.5 module), 48 PD, Ring = 80T 120 PD & Planets = 24T 36 PD