IRI Teams with a spare P60 gearbox?

[MechEng83]

To transition between a 5:1 and 4:1 stage, you need a special carrier/sun gear that goes from the 5:1 planet spacing to the 4:1 sun gear size. There are actually 5 different carriers for the P60 gear box.
- 4:1 planets to output (required for last stage)
- 5:1 planets to output (required for last stage)
- 4:1 planets to 4:1 sun
- 5:1 planets to 5:1 sun
- 5:1 planets to 4:1 sun

http://banebots.com/c/P60P-CP

Incidentally, if you have mixed 4:1 and 5:1 stages, all the 5:1 stages must appear first in the gear box (nearest the motor), meaning you need to have an input motor with the 5:1 sun gear.

[KrazyCarl92]

I understand that the 5:1 stage requires a specific carrier plate (and planet gears), but are you saying that the 4:1 sun gear can not be pressed into every variety of carrier plate that accommodates the previous 5:1 stage? There's a different carrier plate for pressing in a 5:1 sun gear vs. a 4:1 sun gear? That would be absurd. Why not have the 5:1 sun gear and the 4:1 sun gear with the same press fit geometry?

[MechEng83]

Originally Posted by KrazyCarl92

I understand that the 5:1 stage requires a specific carrier plate (and planet gears), but are you saying that the 4:1 sun gear can not be pressed into every variety of carrier plate that accommodates the previous 5:1 stage? There's a different carrier plate for pressing in a 5:1 sun gear vs. a 4:1 sun gear? That would be absurd. Why not have the 5:1 sun gear and the 4:1 sun gear with the same press fit geometry?

Yes, I am saying that. I don't have access to the gearboxes until I get to our shop tonight to confirm, but I believe the carrier plates are different between the two. From what I recall, the sun gear in a carrier plate fits into a broached hole with the same number of teeth as the sun gear.