5900J: Nikola Tesla 4.0 Reveal /Update Thread (Vex Toss Up)

After spending all winter break putting our robot together, Team 5900J of Bayshore High School proudly presents Tesla 4.0!

Key Features:

10 motors total:(9 393s, 1 269)
-4 on the wheels (393s geared for speed)
-2 on the arms (393s geared for torque)
-2 on our intake roller (393s geared for speed)
-1 for a winch used in hanging (393 geared for torque)
-1 for hook deployment (269)

6-Bar Lift
-Constructed out of aluminum, this lift reaches up to the goal while still allowing the robot to drive under the barrier.
-Our robot starts at 11.5" tall, and the arm can reach up to 24.5" tall.

Dual Side Roller Intake
-both sides are on a swivel, and are forced inward by rubber bands, although they can expand outward (starts with the intake folded to the side to fit in the 18 by 18 by 18)
-Intake has a max capacity of three Bucky Balls (two when hook is deployed) or 1 Large Ball
** Power Distribution with Power Expander **
-We run our arms, winch, and hook on a separate battery to ensure that they have the power needed to keep our robot running at peak condition.

Hanging Capabilities
-The use of a winch and pulley provides extra assistance in insuring that the robot hangs and stays hanging for the remainder of the match.
-Our robot features a hook deployment system running on a motor, to ensure that we can maneuver underneath the barrier, but we are still able to deploy our hook when needed. The hook is currently still under construction, but it will be finished soon.

Multiple Autonomous Programs without use of an LCD Screen
-Using a potentiometer and a sprocket as an adjustable dial, we can select an autonomous based on which part of the field we are on, proving extremely beneficial when paired with teams that either don’t have an autonomous, or only have one autonomous available. Also beneficial for scoring the same amount of points no matter what side of the field we are on!

Majority of construction is aluminum
-Aluminum is crucial for a lightweight robot, which is crucial for hanging.

Anti-Tipping Device
-Our robot takes advantage of an anti-tipping mechanism that folds out during the start of the match, to ensure our robot won’t fall over backwards in competition.

Four motor Drive with emergency backup drive
-Motors are geared for speed to speedily traverse the field
-In case one of the motors gives out, our chain system ensures that we can at least keep driving for the remainder of the match, and troubleshoot any problems immediately afterward.

Here is a link to some photos of our robot!

http://imgur.com/jgDvg75,YoEQ2az,yYA1l2l,FEUnKA9,9BMtuR7,ehSUWT8,m533Wmr,OaMkS2h,ztqVzu9,gGN8my3,KfsrYBu,0mnebcc,NokhUx7,vnD9q3H,NBua7li,3rJzvYJ,jkCPhcF,QHpdRXB,867nAjO,8cZmV0o,I9uTgLq,gjB4PqZ,BB8QTUy,5O3QLcP#0

The wiring is a little messy, but we’ll get it fixed up. We’re mostly finished with the robot, save for a few things we need to add, like the top part of our hook. We’ll post more pics when we’re finished.

Any constructive criticism is greatly appreciated!

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Hanging vid?

We’re still working from home right now, but when we get back to school, we’ll try and put up a video of us hanging. Stay tuned for some other videos though! They will be up shortly.

how have u done at recent competitions

We have been doing very well! We’re constantly improving and expanding our capabilities, and while we are not yet qualified for our State Championship, I believe we have a really good chance at doing so. Our older design was a lot simpler and could only pick up Bucky Balls, but we still did well in competition.

Good robot!

Have you thought about making your bucky rollers larger and further apart? This tends to help you intake faster, as the edge of a larger roller will move faster than the edge of a small roller if they are spinning at the same rpm. You might also consider putting the motor and metal bar under the bucky roller and direct-driving the shaft that has the rollers on it, to decrease friction.

Also have you thought about getting pneumatics to deploy your hook instead of a motor, so that you can use 2 motors on the winch? The added motor would give you the option of gearing your winch up so that you can hang faster.

We have been considering a lot of different roller designs, and we used the smaller ones mainly to save some space, but it’s something we might explore in the future. We also put the intake motors on top to prevent them dragging on the field or hitting the bump, as a precautionary measure (We have seen this happen, unfortunately)

Regarding pneumatics, what we would really like to do is create a catapult with them so we can toss the balls back and forth across the field, opening up a lot of game strategies. The idea behind the motor on the hook is to make sure that we don’t get caught on the barrier when we go backwards, after we have already deployed our hook, and we can control when exactly we prepare it.

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Why do you have a differential on the intake?
Imgur
It looks like the motor power would spin the unconnected side of the differential.
Does the differential power 2 things, or is it basically a bevel-gear mount?

We use the differential as a bevel gear mount in order to control our hook deployment system.

Update 1:

Intake
We reworked our intake by replacing the sprockets on the bottom with larger ones, and we have converted our flaps system to a rubber band and mesh.

Hanging
We finished our hook and are high hanging, as seen in this video:

Arms

We also reworked our arms a bit for more stability and ease of lifting. No more rubber band mess!

Autonomous Selector Switch

We are running 7 autonomous programs on our robot and we reworked our autonomous selector switch. Two of these are collaborative “BHS” Autonomous Programs for when we are on the field with the other team at Bayshore, 5900S: “Alpha”

Inspiration for the selector switch came from this online challenge submission by the CSM Talons VEX U Team:
http://www.youtube.com/watch?v=2nsJ9RqT_G0

Our next competition is this coming Saturday, 1/25/13, at Middleton Madness II, where we will be seeking a State Qualification spot. We intend to go all the way to Tournament Champion!

Pictures can be found here:

[Imgur: The magic of the Internet

Any constructive criticism is greatly appreciated!](Imgur: The magic of the Internet)

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Hi.

I see you guys are using low-strength chain on your drive train. I’d recommend switching that to high-strength chain if at all possible, as low-strength chain is very frail and will likely snap as soon as you attempt to exert any sort of force through your drive (pushing, etc).

High strength chain is much more robust, and shouldn’t break given the loads on your average drive train.

-Alex

EDIT: Woops, never mind, that’s just connected to your shaft encoder. Disregard my comment.

lol, don’t worry. You’re probably not the first to point that out :smiley: We know that the smaller chains aren’t that good for heavy mechanical movement. We are running our front two wheels on high strength chains, however. We wanted to make room in the middle of our robot so that the arm wouldn’t hit the motors.

I’m wondering can you launch big balls with the launcher motor powered?

Fun fact: our motor powered hook originally started as a prototype ball launcher, but the force just wasn’t enough. Later on, we plan to use pneumatic pistons to launch Buckies and Large Balls alike.

So you have launched balls without pneumatics? :smiley:

if you count slightly nudging the balls and getting stuck “launching” :smiley:

So basically there is not enough power for launching? :frowning:

Yeah, unfortunately

You could try loading elastic power with your drive train up to a certain point and releasing them with a motor :stuck_out_tongue:

That could be an idea to explore in the future. We’re pretty close to competition, however.