pic: Team 192's 2012 Gearbox
 

Re: pic: Team 192's 2012 Gearbox
 

Great photo, what is this gear box for?

Re: pic: Team 192's 2012 Gearbox
 

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

gotta love the edit feature.

Re: pic: Team 192's 2012 Gearbox
 

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.

Re: pic: Team 192's 2012 Gearbox
 

Re: pic: Team 192's 2012 Gearbox
 

Nice render, oh wait...

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

- Sunny G.

Re: pic: Team 192's 2012 Gearbox
 

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

Re: pic: Team 192's 2012 Gearbox
 

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?

Re: pic: Team 192's 2012 Gearbox
 

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

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.

Re: pic: Team 192's 2012 Gearbox
 

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.

Re: pic: Team 192's 2012 Gearbox
 

Wow that's really sweet, congrats!

Re: pic: Team 192's 2012 Gearbox
 

That's amazing. Nice job!

Re: pic: Team 192's 2012 Gearbox
 

Would i be able to get a CAD model of this? I'm guessing you have one considering its so nice. I have no intention of stealing your design or anything, just want to look at how it was made and such. More pictures would work too, but i would rather have the CAD.

Thanks :)

Re: pic: Team 192's 2012 Gearbox
 

This is a beautiful gearbox. An idea worth stealing for next year. By the way how did you hob the worm wheel?

Re: pic: Team 192's 2012 Gearbox
 

Thank you all for your praise

My intention is to publish the CAD model of the gearbox on FRC designs sometime soon after build.
I will also be releasing a write up about the design process as well as the choices I made and the reasoning behind them.

Another note on the Gearbox. It was originally designed in the spring/summer of last year and two prototypes were made in the fall. It was then refined and modified for the 2012 FRC season.

I did all of the design work on it and everything but the dust shield was manufactured by myself or other fellow students on our team, a large portion of which was done on our CNC mill.

If you mean how did we cut the worm gear the answer is we didn't. Both the worm and worm gear were purchased from Motion Industries but they are also available from sdp-si.