Simple 2-Speed 6WD for teams with few manufacturing resources

[davidthefat]

Thank you Miss Madison; from the looks of it, my team might have to make a kitbot this year. The majority of the team is rookies this year and my mentor has put all his eggs into the software basket (5+ experienced veteran programmers).

[Chris is me]

Originally Posted by davidthefat

Thank you Miss Madison; from the looks of it, my team might have to make a kitbot this year. The majority of the team is rookies this year and my mentor has put all his eggs into the software basket (5+ experienced veteran programmers).

Honestly, there are a lot of games where I'd rather have that than all hardware, no software like we have now.

[RogerR]

Madison,

Any reason for the choice of IFI wheels over AM plaction wheels?

[Ninja_Bait]

Originally Posted by RogerR

Madison,

Any reason for the choice of IFI wheels over AM plaction wheels?

Probably to get the 4x2 dimensions.

[Mk.32]

Originally Posted by RogerR

Madison,

Any reason for the choice of IFI wheels over AM plaction wheels?

I believe the intent was for extra traction.

I may have done calculations wrong, but this thing looks like it's gonna go REALLY fast, like 22 fps. Is it supposed to be like that, or did I do my calcs wrong? (Most likely got those wrong, but I did it twice and got the same answer)

[apalrd]

Originally Posted by SuperNerd256

I may have done calculations wrong, but this thing looks like it's gonna go REALLY fast, like 22 fps. Is it supposed to be like that, or did I do my calcs wrong? (Most likely got those wrong, but I did it twice and got the same answer)

What are you calculating the ratio with (What reductions in each stage, and what motor free speed, and speed loss constant?)

I get 3.86 and 9.86 ft/sec with no speed loss and 5310 CIM free speed, for reference.

The stages of reduction are:
12:40 CIM->cluster shaft
15:48 OR 28:35 cluster shaft->shift shaft
16:36 chain

It seems like a lot of chain reduction with 4" wheels. The ratio chosen seems to be perfect for 6" wheels (5.79 and 14.83 ft/sec with no speed loss, 4.69 and 12.01 with speed loss, 46 amp wall-push in low gear)

Originally Posted by apalrd

What are you calculating the ratio with (What reductions in each stage, and what motor free speed, and speed loss constant?)

I get 3.86 and 9.86 ft/sec with no speed loss and 5310 CIM free speed, for reference.

The stages of reduction are:
12:40 CIM->cluster shaft
15:48 OR 28:35 cluster shaft->shift shaft
16:36 chain

It seems like a lot of chain reduction with 4" wheels. The ratio chosen seems to be perfect for 6" wheels (5.79 and 14.83 ft/sec with no speed loss, 4.69 and 12.01 with speed loss, 46 amp wall-push in low gear)

Well that seems kinda low. My 22 fps is definitely wrong, and I've unfortunately lost the paper I used to calculate it (off to clean my room now!).

Madison, is Apalrd right? This looks like one of the best kitbots I've seen, but 10 fps and 3 fps are not my cup of tea. :|

[Akash Rastogi]

Originally Posted by SuperNerd256

Madison, is Apalrd right? This looks like one of the best kitbots I've seen, but 10 fps and 3 fps are not my cup of tea. :|

Madison won't cater to what speed each person prefers. The speed is up to you with your reductions.

I prefer the speeds Madison has this at.

Originally Posted by Akash Rastogi

Madison won't cater to what speed each person prefers. The speed is up to you with your reductions.

I prefer the speeds Madison has this at.

I am clueless with calculating speed, so can anyone tell me how to calculate speeds from gearbox reductions and the motors and things?

[Andrew Schreiber]

Originally Posted by SuperNerd256

I am clueless with calculating speed, so can anyone tell me how to calculate speeds from gearbox reductions and the motors and things?

http://ewcp.org/calculators/gearbox/single/ Might help you see what effect different reductions have on your output speed.

Originally Posted by Andrew Schreiber

http://ewcp.org/calculators/gearbox/single/ Might help you see what effect different reductions have on your output speed.

Thanks!

[Chris is me]

Originally Posted by Akash Rastogi

Madison won't cater to what speed each person prefers. The speed is up to you with your reductions.

I prefer the speeds Madison has this at.

3 FPS is definitely too slow. It's well below traction limited.