After seeing my team’s robot drive, I have begun to consider changing up the motors in out drive train. But, I want to see what the CD consensus is before I do so. What are you putting on your robot?
Andymark gearboxes aren’t the only ones out there.
Maybe instead of having the gearbox name, have something like “2 CIM 15feet/sec.” That is, unless you want to know what specific gearboxes people are using.
[LEFT]We’re using 2 cims per side with independent middle wheels running mini cims in a tougbox mini. [/LEFT]
I just figured that I would put these two gearboxes because the majority of robots that I have seen use these two gearboxes.
I doubt you will see many CIMple box robots this year. Even with 4" wheels, they are geared too fast (15+fps) for this game with ramps and obstacles and obstructions that give you few opportunities to drive more than 20 feet in a relatively straight line.
We’re gearing our TB-minis all the way down to 12.75 on a 4" wheel, then farther down with chain to our 8" wheels. It’s a top speed of only 5.6 fps, but we reach it practically instantly and eat most of the defenses for breakfast, and the others for lunch.
We’ve got 2 CIMs per side running AndyMark SuperShifters.
2 CIMS per side geared for approximately 9.8 FPS
At that speed, you won’t be eating very many.
- Sunny G.
WCP DS Shifter with 2 CIMS per side
CIMs are overrated :rolleyes:
2 CIMs per side with VexPro single speed double reduction gearboxes.
We’re using 2 CIMs per side in a gearbox based off 1114’s 2014 Gearbox.
Will your robot make it to the tower by dinner time? 
See you at Bayou. We are looking forward to having fresh beignets again.
Wouldn’t miss it!
Wouldn’t miss it!
There is a Cafe Du Monde between our hotel and the Pontchartrain Center. Hopefully I can save one for you.
We’re using a pair of VexPro 3-CIM Ball Shifters on our drive with 2 CIMs + 1 MiniCIM on each gearbox.
The gearboxs use the 3.68x spread options between the high and low gears and also has a 3rd stage reduction giving us an overall ratio of 7.08:1 (10.85ft/s with 4in wheels) in high gear, and 26.04:1 (2.95ft/s) in low gear.
My team is using a custom single stage gear box. Styled after the WCP Single speed gearbox. Set to a top speed of 12.6ft/sec we will be a speed demon. With multiple options for additional gearing changes to match the meta. A unique feature about our gearbox is that they only have one plate per side, the other plate is essentially built into the drivetrain.
2 cims 1 mini cim per side, geared for around 14.5 fps
1 CIM + 1 mini-CIM in a toughbox mini, 2-per-side direct driving 8" mecanum. Top speed of appropx 15 fps (according to the JVN design calculator, we haven’t measured the actual speed).
We are going 3 CIM Ballshifters (3 CIMs per side) on 8" wheels at a max speed of 6.28 fps low and 16.62 fps high.