[Ri3D] Team Indiana Presents: Veronica

[evanperryg]

Once again, probably the best Ri3D team. You guys have set the standard for a strong Stronghold robot. Do you have CAD for the bot you can post? I'm curious to see how you got that shooter crammed in there.

[BoilerMentor]

Originally Posted by nxtmonkeys

Can you make it jump-hang?

This question makes me want to run the math for the situation where the Shovel the fries™, is in the middle position to find the speed the robot would have to carry to make it to the bar...

Originally Posted by evanperryg

Once again, probably the best Ri3D team. You guys have set the standard for a strong Stronghold robot. Do you have CAD for the bot you can post? I'm curious to see how you got that shooter crammed in there.

Thanks. We'll be posting a 3D pdf as well as some other resources, but not a full CAD.

[Kevin Leonard]

Originally Posted by Logan Byers

Our shooting sweet spot is right in front of the tower, with wheels touching the BATTER (base of the tower). Ideally, we'd beat the defense to the spot and take away the chance of the defense blocking our shot. The video of us shooting from farther away was taken during prototyping. An issue we saw with shooting from a distance was the difference in compression between a fresh boulder and a used boulder, which affected shot performance.

Can you give some examples of how the wear affected shot performance? How much wear are we talking about?
That makes me nervous. 5254 and 20 haven't tested with worn balls yet because both teams have only one ball right now.

[Ben Martin]

Originally Posted by Kevin Leonard

Can you give some examples of how the wear affected shot performance? How much wear are we talking about?
That makes me nervous. 5254 and 20 haven't tested with worn balls yet because both teams have only one ball right now.

If I was to guess, it was somewhere around 50 shots. We dialed in the prototype shooter until it worked with one ball, then we tried another ball, which flew completely over the goal.

The foam directly under the skin "crumples" slightly after many shots. You can feel the difference when you squish them by hand.

[slhs]

What was the length of each pieces of the double jointed arm?

[rzoeller]

Originally Posted by Ben Martin

The foam directly under the skin "crumples" slightly after many shots. You can feel the difference when you squish them by hand.

So the curse of 2012 strikes again. Hopefully FIRST doesn't decide to source from a new manufacturer midway through the season this year as well.

[Ben Martin]

Originally Posted by slhs

What was the length of each pieces of the double jointed arm?

I don't remember the exact number, but it's pretty easy to calculate--subtract the height of your mounting location from the height of the drawbridge, then divide by 2 and add a few inches to account for the joint and a bit of extra space for the drawbridge grab.

[Purpose]

Great job Indiana, I love how versatile your bot is, and the fact that it has bumpers makes it even better. Just curious, do you happen to know what gear ratio you're using for the treaded bot's transmissions? The speed and power balance looks perfect from your videos. Thanks a bunch!

[Nathan M]

This robot looks great! I was wondering if your close shot is taken hard stopped on the tower or a few inches away? I couldn't tell from the video.

[Danny Blau]

Originally Posted by Nathan M

This robot looks great! I was wondering if your close shot is taken hard stopped on the tower or a few inches away? I couldn't tell from the video.

Thanks!
We were shooting with our back wheels resting on the hard stops at the bottom of the castle ramps. This proved to be a very effective and reliable place to shoot from. We had also talked about deploying an outrigger to the front of the robot to give us an even more consistent, undependable shooting location.

[Lireal]

Great job on the robot! I was just wondering, why did you end up deciding to use a pneumatic wheel drive train instead of the Rhino tracks?

[PurpleInk]

Originally Posted by Lireal

Great job on the robot! I was just wondering, why did you end up deciding to use a pneumatic wheel drive train instead of the Rhino tracks?

We were asked this all through our 3 day build so we covered it in the Q & A:
https://m.youtube.com/watch?v=PrgI7NRyqbY at about 8:20:20

They did a great job of explaining our reasoning there

Betsy

[Nathan Streeter]

Originally Posted by Ben Martin

If I was to guess, it was somewhere around 50 shots. We dialed in the prototype shooter until it worked with one ball, then we tried another ball, which flew completely over the goal.

The foam directly under the skin "crumples" slightly after many shots. You can feel the difference when you squish them by hand.

Did you discuss the impact of used balls vs fresh balls elsewhere on a video that we could go back and reference?

How much compression were you getting on your balls? (distance from shooter wheel surface to curved backplate)

Thank you for your insights! :-)

[JesseK]

Were the stealth wheels able to manage a long-distance shot in such a short acceleration arc? Approximately how much compression was the ball under while in the shot arc?

Trying to get a 4" diameter wheel to get any distance, even with equal wheel edge speeds as larger wheels, has been ... challenging...

[swicki]

Originally Posted by BoilerMentor

Thanks. We'll be posting a 3D pdf as well as some other resources, but not a full CAD.

Any update on the 3D pdf?