21417A Vex Over Under Mid-Season Robot Explanation

[@1233Whiplash]

The HS supports for the drive is so clean

[@orreroyang_81988E]

The bot is so clean, solo awp and hang are crazy❤❤

[@Cardboardgod1532]

I really like the blocker/hanger

[@kevindaney7777]

Wonderful design, so clean and well engineered!!! Nice work

[@kendallsteele8061]

Robokauz upload consistency is insane

[@kendallsteele8061]

Best robotics channel

[@338AIterated]

I love robokauze!!! Awsome robot!!!

[@6627S]

the bot is so cleannnn ❤❤

[@skibidislicersigma]

Any chance you guys could explain that second stage rope? I saw no mention of it in the video, but its a really cool feature!

[@1233astro]

Such a cool bot!

[@luisserranolaguna1610]

now let's see paul allen's drive train pulls out this sweats vigorously

[@ForgeRobotics]

I have a question. At 2:53, you push the triball over the barrier, but it is with a concave surface. The concave surface is created by 2 separate things, which could make it concave even if the other wasn't there. The sleds create a pocket that the triball is able to slide into, which is considered concave. The wings also have a wedge on them, which I think is an incredible design idea, except it counts as being concave and not convex or flat. This is confirmed to not be plowing by the addition to the game manual that states that whatever is pushing the triball must be flat or convex. I was confused by this because I am not sure how this didn't end up in a DQ for you if you were holding a triball in the intake while you pushed another one or when you push multiple triballs.

[@duncanblank9717]

So far we have not really had any issues with referees at any tournaments with reference to the surfaces you mentioned on our bot. One referee did call into question the space between the back sleds as being concave and controlling triballs, but the sleds not protrude enough to turn the tribals with the robot and the back plows the triballs. For that section of the bot the q&a states that it is up to the referee’s discretion. As far as the legality of wedges on the wings, the q&a seems to permit vertically concave surfaces as they function to plow the triballs rather than be in possession of them. “However, generally speaking, we would expect that a "vertically concave" face of the Robot as shown in the sketch would exhibit behavior closer to Plowing (uncontrolled movement in a preferred direction) than Possession.” Hope this answers your question!

[@minlu8309]

I believe currently in local tournaments the judges and refs dont really care about it. However, in higher up level tournaments which are worlds-qualifying or national level tournaments, the judges will be more strict and enforce this rule. This comes from experience where the inspectors were 5x more careful while inspecting our robot during states and signatures. Just be wary of these rules.

[@HippityhoppityGnW]

@@minlu8309a lot of teams run these wedged wings now, it’s very legal A few examples: 5203G Gremlin 229V Ace 3223A Kachigga And so on

[@Saureesh]

Loved the robot ❤ Quick question do u guys use any types of sensors

[@kendallsteele8061]

2:53 Boogie Sticker Under Wing😎

[@robokauz]

I knew one of you would point that out

[@KingSupreme125]

In the FUN interview is that your notebook(that really thick 3 ring binder)? If so what the heck.

[@lettucejr9678]

Awesome robot! How does your blocker fold down and extend over?

[@robokauz]

Well the first stage is directly attached and tensioned to the endgame and the second stage is pulled up by strings attached to the far side of the base near the hinge. The string acts like a 4 bar and keeps the overhang roughly parallel to its lowered state

[@cuongcjnguyen4405]

how to you paint your robot? what type of paint do you guys use?

[@duncanblank9717]

We start by scuffing the metal so the paint adheres to the surface better, and then put a layer of primer on the metal. After that we just use normal spray paint and apply two to three coats.

[@dontsub6003]

Hey, I was wondering what the other gear ratio for your drive was? I think it's 24 to 60 inside the drive, did you use custom cut polycarb gear to get to 1500rpm for the drive shafts?

[@angrybokoblin8777]

Why are the drivetrain motors not set up to quick swap? I would imagine you would want to swap the motors a lot with a 600 rpm drive.

[@duncanblank9717]

They don’t overheat unless a lot of defense is being played or if we are driving for 5 minutes. We keep freeze spray on hand for back to back matches. We have had hot swaps fall off the drive before and didn’t think they were necessary.

[@CrazyAces79298Z]

How does the blocker spring up when the piston is up, or in another words how does your blocker collapse with the string? Nice robot btw

[@JackWGoat]

Hey Rk, I'm just wondering how you managed to cut your high strength gears in half. I noticed you mentioned them last season on your spin up robot, and you appeared to have them on your new drive. Any help would be much appreciated.

[@robokauz]

We used a good ole handheld hacksaw… it took awhile and you could probably make a better cut with a band saw but it worked

[@JackWGoat]

@@robokauz Thanks. Much appreciated.

[@Domitronic2Gaming]

Are robot for the vex team is not the far in but working well

[@05enmanuelgg]

Do you guys use pneumatic thread sealents of any kind? And are those pneumatic Pistons single acting or double acting?

[@josephavalos9515]

Im new to robotics can u show how to bulid that catapult

[@Meltdown4543M]

Do you slow down your drive? If so to what speed and how does it compare to something else that speed?

[@YNOT2.0]

Also, what size drill bit did yall use to drill holes for the high strength axle?

[@slipperking]

Isn’t pushing with concave surface (wings at tips) considered possession because they are bent at the end

[@hydrovax]

Hey just wondering how did you guys drill holes into the high strength shafts thanks

[@robokauz]

We usually just mark them then use a handheld drill

[@judyalexa]

What do you use to lock the wings?😭🥺

[@Connor2055A]

what screws did you guys use for the HS shaft structure on the drive?

[@Taran_K]

nice robot

[@Unofficialbao]

I have a question about how you cut your 24T metal gears in half

[@robokauz]

We just used a Hacksaw

[@difficult.to.underestimate]

How long did it take to build from start to finish?

[@robokauz]

We’ve been kinda working on it since august

[@notretro_6130]

How many motora do you have on your catapult with motor inerts

[@hassaannasim3413]

How do your autos work so well without tracking wheels

[@polar5717]

I'd assume it's a combination of a lot of things. First, the robot is clearly very solidly built and well maintained. So there isn't much variation mechanically. Then, I would imagine they use a PID that they've spent plenty of time tuning to make it as perfect as possible. Finally, if you've ever been to a comp Robokauz was at, you'll notice that they are constantly working to tune their autons to fields and improve them at each tournament. So really it's the culmination of all the hard work they've put into building, programming, maintaining, and tuning the robot and the autons every competition.

[@robokauz]

@@polar5717 that is correct. Also there are distance sensors located on the rear sleds which line up with the field to add a field centric element to the autons.

[@jadynhasstupid2275]

@@robokauzI sort of disagree with this idea as it makes your autos slower, harder to make, slower to make and maintain as well as change and it creates an aspect of limitation around moving around field walls and such to minimize inaccuracy. At least one odom wheel makes it insanely easy and fast to make autos.

[@robokauz]

@@jadynhasstupid2275 true we have used Odom wheels for years and last year with boomerang control we were able to go fast with accuracy. This year we aren’t using the boomerang or tracking wheels, and we haven’t had any issues since the field movements are not very complicated this year and the Odom isn’t very necessary for us.

[@tobii4374]

I am a bit confused and would appreciate some help here. The game manual defines that cable ties may only be used to secure cables. Am I wrong here or not? The bot would not pass the inspection. My second question is, what do you use on the catapult to shoot the triballs, which component is this black ball? Thanks in advance for the help

[@3110D]

Zip ties can be used for anything. I think you’re getting it mixed up with tape, which is limited.

[@Roger-65]

I assume its green motor drive?

[@robokauz]

No all the drive motors are 600 blue cartridges

[@Roger-65]

How do you get your catapult to launch that far with only one motor how many bands?

[@YNOT2.0]

Just curious, is there a reason for the gears going on the inside portion of the wheel base?

[@shivanshpandey8362]

It helps with center of gravity

[@minlu8309]

If you used 66 watts on the drivetrain and 11 watts on the intake, did you only use 11 watts on the catapult? According to my team's testings, 11 watts is not nearly enough to pull down that much strength. According to the fall reveal video of this robot, it said "25 RPM catapult" so there has to be a motor.

[@nikethbalakrishnan208]

I'm not on there team but I assume that they use a single 100 RPM motor to run the slip gears on the catapult. On our robot with we run a similar linkage and it works great.

[@DrollerApollo13]

Are the wings concave?

[@duncanblank9717]

Nope, they are not concave.

[@difficult.to.underestimate]

what is the catapult rpm/ratio?

[@robokauz]

The slip gear is powered at 100 rpm which equals 100 shots per minute, and the catapult spins at 25 rpm

[@sunayk5092]

Great robot!! Just wondering, are you guys running your 600RPM drive at 100 percent speed? I have my drivebase at 600RPM and it seems a lot faster and uncontrollable than what I saw in your videos.

[@robokauz]

Our motors are at full speed but we usually can’t accelerate to full speed during a match

[@sunayk5092]

@@robokauz on average how fast is it going during a match?

[@wellliam5554]

What velocity / torque you have it going?

[@yoobinpark-bz6nf]

How do your attach the piston onto the shaft collar? Do you custom thread them?

[@robokauz]

Yeah we thread them

[@yoobinpark-bz6nf]

Ok

[@kaelberberich1765]

@@robokauzwhat size is the piston threading?

[@sunnybuilds]

Did you still have slip gears for the cata?

[@robokauz]

Yep 2 slip gears and 2 ratchets

[@DylanThrasher-bo3hp]

How do you guys get your kicker to start down?

[@robokauz]

There are 2 ratchets which keep it in place

[@462Z_Robotics]

Is this robot 600 RPM on 3.25? that seems excessively fast, but it worked great!

[@robokauz]

The wheels are 2.75 so it isn’t too fast but it is faster than robots normally are. Usually teams have 450 on 2.75.

[@462Z_Robotics]

Do you think 400RPM on 4 inch wheels is too fast? @@robokauz I have a lot of driving experience on 343RPM 4 inch.

[@sunnybuilds]

What kind of motor did you use for the cata? Was it a high torque motor?

[@owocherry]

do you have a cad model for the sleds that you would be willing to share?

[@MasterPro-yu5dj]

Yea I would like that too

[@mrs.magicguy]

how did you manage to make your cata go down a bit and then hit the triball, I’ve seen many teams do it but haven’t quite figured out how to myself.

[@freddobar6498]

I think your referring to a slip gear? a gear with teeth cut off so when the cata gets so far down there's no longer teeth to engage and so the bands can pull the cata up without interacting with the motor.

[@Rayane_Editz17]

Great🎉

[@JohnDoe-mb1yt]

How did u program the 6 motor drive

[@3110D]

I want that blocker 😂 can I have it

[@SukhrajRandhawa2353]

How many teeth did you shave off?

[@catdadjoe4404]

Can I have?

[@6627S]

can i ask what ur rebuilding to? 👀

[@6842K]

Its gonna be a 8 motor drive pto to Z tier hang and a slapper that has a 13ft arch

[@huhrawz]

levitating hoverboard

[@jameszhang5401]

8 motor flywheel with no drive

[@robokauz]

@@6842K how did you know?!!!

[@robokauz]

We are probably going to make some sort of high shooting robot with a blocker, kicker, pto, and a few other things

[@thanosgaming1732]

HEY, awesome robot. how heavy is it?

[@robokauz]

13.7 pounds

[@Unofficialbao]

Is it the 50 mm stroke piston or the 75mm?

[@Unofficialbao]

for the b tier hang

[@ryanchan-h4k]

i still dont really get how you guys saved air