Thanks for reminding me about the speeds John, I forgot about them
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Well, we think an output sprocket of 12-16 is appropriate depending on the game situation. Which gives us 5 reasonable sets of speeds. Now, keep in mind, not all 4 speeds of each set are the ones that would be useful for a game; We already know 4-speeds are not the most practical and we already know that really high speeds can not always be used. Also, these speeds are with estimated inefficiency. I think I tended to overestimate the inefficiencies, so I don't know if they are above or below.
12; 3.4, 6.0, 9.2, 16.4
13; 3.6, 6.5, 10.0, 17.7
14; 3.9, 6.9, 10.8, 19.0
15; 4.2, 7.4, 11.6, 20.3
16; 4.5, 7.9, 12.3, 21.6 (that's the field length in 3.3 seconds from a standstill. That's with only two small CIMs as well, it's faster with the Big CIM and/or FP added)
Okay, once again, I know the high speeds there are high.... really high. But, that is just the available range. The lowest gear is well below traction limited in each, so it didn't hurt to bump up the speed much. (3.4 vs. 4.5 fps in low is such a small difference).
Like Uncle Waldo said; this was more for an all around fun/learning experience. I got a lot of feedback on my CADing (apparently things don't allways work like in inventor...
), and they learned a whole bunch of machining and mechanical things. Also, it's being handed off the programmers shortly to give it a nice gyro and encoder based closed loop control system with an automated shift scheduler. Now, considering this was cheaper than the AM Gen3s, and they can still just bolt right on; I think it was very worthwhile to use the 4-speeds on the prototype.
EDIT: and yes, those are spinners that ride on ball bearings in the last picture.... The students asked for them, how could I say no?