pic: Team 192's 2014 Gearbox

[Rauhul Varma]

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[s_forbes]

Beautiful. I suspect that the multiple mounting points for each CIM are to vary the belt tension? Also curious on what you did to manufacture the plate with a gradual and accurate bend. The details on this gearbox are amazing!

[MetalJacket]

Wow, almost thought that was a render at first. Neat idea using pulleys for your first stage of reduction - I'm guessing that was to allow you to locate your output shaft off to the side like it is (motors over the wheel well?).

[Botwoon]

Beautiful gearbox, as usual.

[Rauhul Varma]

Originally Posted by s_forbes

Beautiful. I suspect that the multiple mounting points for each CIM are to vary the belt tension? Also curious on what you did to manufacture the plate with a gradual and accurate bend. The details on this gearbox are amazing!

Firstly, thank you! Your guess is exactly what they are, they adjust the CIM's C-C Distance from +0 thou to +50 to account for manufacturing tolerances. As for the shield, the one pictured was actually manufactured by one of our sponsors but we are in the process of making a rig to bend the plates. Once they are completed/anodized we will be replacing them with ours. (We are testing different curves for bending so that once the plate springs back from the bend it will be in the correct shape)

[Rauhul Varma]

Originally Posted by MetalJacket

Wow, almost thought that was a render at first. Neat idea using pulleys for your first stage of reduction - I'm guessing that was to allow you to locate your output shaft off to the side like it is (motors over the wheel well?).

I did use belts on the initial reduction so I could put the motors wherever I wanted and the motors do hang over the center wheel.

[Steven Donow]

I've yet to see a gearbox from you guys that isn't a work of art. Such s nice gearbox

[Jonathan Norris]

Just incredible, so compact and light. Never thought of using belts on the motors, the weight savings must be huge.

[Joey Milia]

Originally Posted by DevenStonow

I've yet to see a gearbox from you guys that isn't a work of art. Such s nice gearbox

That has just been the past few years. Glad to see a tradition getting started though!

[roystur44]

Great job,

Would love to see the other side with the gear shifting layout. Is there a encoder on the transmission? Neutral?

[Rauhul Varma]

Originally Posted by roystur44

Great job,

Would love to see the other side with the gear shifting layout. Is there a encoder on the transmission? Neutral?

Unfortunately I'm not sure when I will be able to post a side view as, but I can give you a some details and will post a picture once the others are assembled.

The gearbox features a custom ball shifting mechanism running at 19.5 ft/s and 8.5 ft/s with VexPro (originally 1/2" Hex) Gears on R10 Open bearings from USA Bearings and Belts (unlike the bushing in the VexPro gearbox). There is an encoder from US Digital encoder (S4-120-250-N-S-B) on a 3D printed mount connected to the shaft with the two black plastic pulleys via a section of 1/4" ID surgical tubing.

[BBray_T1296]

I am surprised you opted to have the 2 CIMs with the pulleys at the shaft tips and the one with the pulley at the bushing.

Is there any specific reason for this? I would have thought the other way around would be better.

[Rauhul Varma]

Originally Posted by BBray_T1296

I am surprised you opted to have the 2 CIMs with the pulleys at the shaft tips and the one with the pulley at the bushing.

Is there any specific reason for this? I would have thought the other way around would be better.

The main reason reason was so that the various mounting holes for the motors were not covered up by a belt, also I prefer having the longer lengths of belts closer into the plate.

Another thing I forgot to mention, the gearbox actually is 2 CIMs and 1 MiniCIM, with a CIM and MiniCIM sharing a belt.

[Answer42]

You guys have certainly elevated drive train gearboxes to an art form. I think the thing that strikes me about them is the level of detail and thought put into them is not often seen in a six week design window, even from the great teams. Good luck this season

[DampRobot]

Originally Posted by Answer42

... not often seen in a six week design window...

I believe they at least partially develop thse gearboxes in the fall.