pic: Team 192's 2012 Gearbox

[Joey Milia]

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[Andrew Bates]

Great photo, what is this gear box for?

[wilsonmw04]

my guess: shooter err... I mean drivetrain! ;-)

gotta love the edit feature.

[sdcantrell56]

I'm sure it is for their drivetrain and they are wanting some resistance to backdriving (depending on the efficiency of the worm gears). Also looks like it is for a wcd of sorts.

[Ty Tremblay]

I would say drive train.

[ttldomination]

Nice render, oh wait...

Is that red delrin? Or just a really flat red paint on Aluminum?

- Sunny G.

[Gray Adams]

Originally Posted by ttldomination

Nice render, oh wait...

Is that red delrin? Or just a really flat red paint on Aluminum?

- Sunny G.

It's all bead blasted and anodized aluminum. The shaft is steel, and the bottom dust shield is 5052.

[Ty Tremblay]

Assuming your worm reduction isn't backdriveable, how does the drive train react when you try to stop fast? The nature of worm gears to be non-backdriveable would make your robot very difficult to push, but also makes it so that you can't coast to a stop.

Do you "coast" via software? Or did you determine that you won't snap any gear teeth off?

[Joey Milia]

Yes this Gearbox is for our drive train
and
Yes it is for a WCD

Originally Posted by Ty Tremblay

Assuming your worm reduction isn't backdriveable, how does the drive train react when you try to stop fast? The nature of worm gears to be non-backdriveable would make your robot very difficult to push, but also makes it so that you can't coast to a stop.

Do you "coast" via software? Or did you determine that you won't snap any gear teeth off?

The worm is a high efficiency 4 start gear. It is backdriveable, albeit with higher resistance than a spur gear gearbox. If they were not backdriveable, we would not be using them due to risk of the worm gear teeth shearing when we get hit.

The purpose of this gearbox is not to make it hard to push, but to make it small and have the cim's parallel to the sides of our frame.

On an off season prototype, we had victors set to brake mode and it worked really well. However, we have set the victors to coast not because of the gearbox, but because of weight distribution in the rest of the robot.

[Sb28000]

That's a really intriguing design, nice work guys. I was wondering to myself if anyone had ever oriented their CIMs on another side of their gearbox other than directly across from the output shaft (I was thinking about putting them on the same side as the output shaft, just as an idea to maybe save space and work on as a CAD challenge). But that's a really cool solution to the challenge of saving space on the bot.

[IndySam]

Wow that's really sweet, congrats!