3 NEO/CIM Toughbox Mini-based gearbox

Due to the success found by 7561 of 4 NEOs on the KOP this year, the only logical way forward is 6. This is a collaboration between 7561 and 4802.

This is a 3 NEO/CIM gearbox that is made of 2 CNC’d 4mm aluminium plates, but uses the gears from the KOP Andymark Toughbox Mini. Designed by 7561 and to be machined by 4802 it is meant to be a cheap way to get all the power of 6 NEO motors. Designed to fit where a Toughbox Mini would normally such as on an AM14U4 for the needs of a new team.

In the images none of the bolts, washers, spacers or clips are shown. Churro is planned to space the gearbox in the four holes near the bottom corners and top middle.

As this is my first gearbox I am open to suggestions or improvements from those more knowledgeable on the subject. Has anyone else done a similar thing? Would aluminium gears cause trouble or are they fine for the weight savings?

Fusion 360 File: https://www.dropbox.com/s/jk27udr8yjam2h3/3%20NEO%20Toughbox%20Mini.f3z?dl=0

STL File: https://www.dropbox.com/s/c8dlbi0ftgrirb5/3%20NEO%20Toughbox%20(4802%2C%207561)%20v32.stl?dl=0

STEP File: https://www.dropbox.com/s/cgd95okfe4b0moj/3%20NEO%20Toughbox%20(4802%2C%207561)%20v32.step?dl=0


There are tons of gearboxes of this variety all over CD, just give it a search. It will likely be helpful to see some examples.

For feedback – I noticed that if you’re CNCing these plates, you will need to add a radius to the corners of your pocketing and numbers for the endmill to mill inside the pocket. Also, the lower pocketing seems to come a little close to the corners where it looks like your mounting holes are. I would be concerned about bending the plate by over torquing the bolts to mount the motors (IMHO). I didn’t look at the CAD model but depending on how it’s mounted this may not be a problem.

I don’t know for sure about the aluminum gears but I’m sure someone else of more wisdom that me can comment and help out.

I would encourage you to check the ramp pocketing video (helped me a lot) here if you’re interested: https://youtu.be/wGmsnD0KQMs. Also they have great series for most facets of CAD in FRC, I highly recommend watching them.

Looks good overall!

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