Team 3309 Presents: Gateway

[dcarr]

http://i.imgur.com/tkJqJod.jpg

Reveal Video
(https://www.youtube.com/watch?v=Ze_cuGXuyIw)

Shooter

2-ball/1-hot autonomous
Elastic catapult with 2-CIM winch
Zone 1, truss shots


Ground Pickup

4-motor piston-actuated
Stuck ball protection
Low-goal scoring


Drivetrain

2-speed 4-CIM custom 3309 octanum chassis
Full encoder support and on-the-fly switching of drive modes
17 ft/s in mecanum mode
4 ft/s in traction wheel mode


See you at the Los Angeles and Las Vegas Regionals!

[Akash Rastogi]

Turned out great, David! You guys are quickly becoming a favorite from California.

Do you have photos of your drive setup?

Also, how robust is that intake arm?

Best of luck!

[mwmac]

Solid looking robot! Good luck in L.A. and we will see you on the field in Vegas...

[Lil' Lavery]

If you have the weight, you may want to consider adding some sort of protection or shielding for those intake deployment cylinders. 1712 has a similar set-up, and we noticed during practice that a direct hit from a flying ball can cause the piston rods to bend. Granted, we're using 3/4" bore cylinders, they're more exposed, and it was first noticed during catching practice (and later repeated during aerial inbounding practice). With your larger bore (1 1/4"??), utlization differences, and more structural elements near the cylinder the risk may be less for you than it was for us. However, we added some aluminum bars above ours to remove the risk of having our intake get stuck in the deployed position because of a bent piston rod.

[Mark Sheridan]

If you have the weight, you may want to consider adding some sort of protection or shielding for those intake deployment cylinders. 1712 has a similar set-up, and we noticed during practice that a direct hit from a flying ball can cause the piston rods to bend. Granted, we're using 3/4" bore cylinders, they're more exposed, and it was first noticed during catching practice (and later repeated during aerial inbounding practice). With your larger bore (1 1/4"??), utlization differences, and more structural elements near the cylinder the risk may be less for you than it was for us. However, we added some aluminum bars above ours to remove the risk of having our intake get stuck in the deployed position because of a bent piston rod.

I think these are 1-1/8", yeah we been slugging balls at the practice bot, so far its been good but we bought 4 more spares just in case. We are running the comp bot with a secondary regulator for these cylinders, 60 psi is overkill.

[Lil' Lavery]

I think these are 1-1/8", yeah we been slugging balls at the practice bot, so far its been good but we bought 4 more spares just in case. We are running the comp bot with a secondary regulator for these cylinders, 60 psi is overkill.

Agreed that 60 psi is overkill. We were running ours at ~30-35PSI, but bumped it up to around 40 psi afterwards to hopefully overcome any slightly bent piston rods we experienced. We borrowed* some spares from 708 when the inital issue occurred, and purchased more afterwards. We also acquired some 1 1/4" bore pistons, but opted not to change to them after we added the shields, since they would end up awfully close to our frame perimeter. We've only experienced one bent piston at competition, and that was the result of user error while attempting to push the buttons on the solenoid (one side deployed while the other didn't, and the bend was easily fixed afterwards).



*Zygmont, note "borrowed" :cool:

[cadandcookies]

I think these are 1-1/8", yeah we been slugging balls at the practice bot, so far its been good but we bought 4 more spares just in case. We are running the comp bot with a secondary regulator for these cylinders, 60 psi is overkill.

The problem isn't balls, it's other robots. While contact inside the frame perimeter is a technical, that doesn't change the fact that it will probably happen if your robot is as good as it looks and you'll get stuck fixing them.

Seriously, looks like a great robot. I hope I get a chance to see it at Champs.

[Mark Sheridan]

The problem isn't balls, it's other robots
yeah, there is a few other parts that can break too. with the limits of fabricated spare parts, I will have to favor saving the weight for fabricated spare parts. COTS spares on the other hand don't have a limit. I am keeping my spare cylinders in their packaging, I hope to return them if luck is in my favor.

We practice with 3476 a bunch, so far we have been holding up to their ramming speed. We have gotten whacked by their intake a few times. Not sure how we will do in the 6 robot scrum. I do like the 4ft per second tank mode. You should ask code orange about being the receiving end of bulldozer mode;)

[OZ_341]

See you at the Los Angeles and Las Vegas Regionals!
Bot looks great!! Good luck at LA and LV.

[SenorZ]

Looking good! We'll have the great pleasure of competing with, and against you, in both Los Angeles and Las Vegas.

...and maybe an in between scrimmage.