05-02-2017 16:26

ollien

Re: pic: Titanium Tomahawks 2170 Teaser

Is that a 3d printed PVC pipe hex plug? Could I get the model for that?

05-02-2017 16:32

Chris is me

Re: pic: Titanium Tomahawks 2170 Teaser

Akash, you forgot the box!

Sure, PM me your email and I'll send it over. It's nothing crazy.

05-02-2017 20:13

D_Price

Re: pic: Titanium Tomahawks 2170 Teaser

Looking good! Good luck this year. Only question: Are you worried about being too top heavy when moving throughout the playing the field and suddenly stopping? Just wondering.

05-02-2017 20:23

dodar

Re: pic: Titanium Tomahawks 2170 Teaser

Seem some 2009*shudder* inspiration in this robot.

05-02-2017 20:48

Sperkowsky

Re: pic: Titanium Tomahawks 2170 Teaser

I'd work on some weight down low if you can. If you accelerate quickly and then stop suddenly this robot is on its side.

05-02-2017 20:49

Billfred

Re: pic: Titanium Tomahawks 2170 Teaser

Best I can tell, 2009 is The Game You Should Be Cribbing Notes Off Of.

Personally, I'm curious about how that ramp is getting raised and lowered. I'm liking the concept though--this is borderline cheesecake-able to help a team operate at a higher level.

05-02-2017 21:09

1493kd

Re: pic: Titanium Tomahawks 2170 Teaser

This is very similiar to our design. We are using pnuematics to raise our floor(very slowly) and close off the opening for the space that we intake fuel from the floor.

05-02-2017 21:15

AcesJames

Re: pic: Titanium Tomahawks 2170 Teaser

Our dimensions (before bumpers) are 22.5 x 24.5 x 35.5, and we have discussed the potential for falling over. Luckily, about 80% of the weight here is within 8" of the ground, and that only looks better when we add bumpers and a battery.

We took a lot of inspiration from 111, 1918, and 2775's 2009 robots here.

Thanks for letting us know, with such certainty, how our robot will perform. I can only assume you're building the exact same robot and have already driven it?

Without going into too much detail about our game analysis, we identified 2009 very early on as our primary year of focus in robot design.

That ramp (elevator carriage) is supported on each corner by a 3D printed bracket bolted to a linear bearing. The bearings are each riding on a stainless steel rod, one in each corner. The current plan is to have a run of #25 chain on either short side of the robot (two total) and bolt the chain to the carriage. Idler sprockets at the top of the robot will be connected by a shaft and we'll tuck a gearbox in the drivebase to power it on one side.

05-02-2017 21:31

Cothron Theiss

Re: pic: Titanium Tomahawks 2170 Teaser

What're the black rollers made out of? It looks like continuous strand carbon fiber.

05-02-2017 21:33

AcesJames

Re: pic: Titanium Tomahawks 2170 Teaser

The rollers are 2" diameter PVC and they're coated in liquid Flex Seal (as seen on TV).

http://www.flexsealproducts.com/product/liquid/

05-02-2017 21:36

1493kd

Re: pic: Titanium Tomahawks 2170 Teaser

Does your "elevator ramp" drop down to "ground level"? How are you lifting ground fuel up to the "ramp"

05-02-2017 21:41

AcesJames

Re: pic: Titanium Tomahawks 2170 Teaser

There will be a cut out in the front of the ramp. Another roller will go between the white intake roller and the first black dump roller. The intake roller and this new roller will be wrapped together with polybelt. Behind these rollers we'll have a vertical wall of material that will cause the balls to roll up and then out and down onto the ramp - we're calling this the "Waterfall".

The cut-out piece of ramp will be re-attached with a hinge to act as a "trap-door" that folds out of the way when the elevator is in the floor position, and folds back down when the elevator lifts the ramp to score in the low goal (between the two black rollers) or dump into other robots (above the top black roller).

05-02-2017 21:42

Sperkowsky

Re: pic: Titanium Tomahawks 2170 Teaser

I truly apologize for giving my advice. Next time I'll make sure to build an identical robot and do some testing before giving anyone a tip.

05-02-2017 22:17

frcguy

Sick bot guys! Can't wait to see it in action.

05-02-2017 22:39

D_Price

Re: pic: Titanium Tomahawks 2170 Teaser

And Akash I really want to see those cinematic shots of the robot before the reveal haha
Good luck this year to your team.

05-02-2017 23:01

Akash Rastogi

Re: pic: Titanium Tomahawks 2170 Teaser

2170 ain't got money fo dat

Thanks Derek - please follow the Facebook and Twitter for all media! I'll have my DSLR in the shop near the end, we still have a lot of work to do. Your sheet is looking sick so far!

Some background on this team: very intelligent and enthusiastic kids and mentors, very little school support. This robot is built with COTS parts and only manual hand and power tools. 3D printing helped a ton filling in the gaps!

We also only meet three days a week, of which we lost 3 to snow days, so things have e been tough.

I'll make sure the kids update social media often. Thanks for the support!

06-02-2017 03:36

cadandcookies

Re: pic: Titanium Tomahawks 2170 Teaser

How have you guys liked the flex seal? How do you think it compares to other methods of creating rollers (urethane or latex tubes, wheels, et cetera)?

06-02-2017 09:15

Chris is me

Re: pic: Titanium Tomahawks 2170 Teaser

I'm a little worried, but not too much. There's maybe five pounds total for that mechanism at the top of the robot, and then there are the rollers (what are they for, why are there two of them?), but otherwise almost all of the robot's mechanisms, motors, etc. are pretty low to the ground. The robot will pretty clearly come in underweight, allowing for ballast to be placed in the drivetrain near the end of build season.

I agree that this game is very similar to 2009 in terms of how fuel should be handled by any team.

Without giving everything away, this robot's fuel manipulation prioritizes volume over scoring directly. At lower levels of play, this robot can cycle gears and hang, with some low goal action whenever the robot gets the chance to score a point or two. At higher levels, this robot could grow into a great assisting robot, helping top tier shooters with fuel acquisition.

Pneumatics would definitely be an option for powering the elevator that would be robust and repeatable. However, this team doesn't have any other pneumatic needs on the robot, and the team has a strong software group as well as a history with chain driven single stage elevators (2015). So a smaller, lighter version of the 2015 elevator was an obvious choice.

The floor raises and lowers primarily because it nearly doubles the robot's ball capacity over a more conventional belt-driven ball loader thing. The floor also needs to be at a few different heights for the various outtake functions the robot can do.

I think the reason this rubbed people the wrong way was not attempting to point out an issue, but the tone of the message, specifically how absolutely certain you are of the issue. The way it's phrased gives off the impression that you're certain the team hadn't thought of this issue or planned anything to deal with it.

Contrast it to the message posted directly above you, which is saying exactly the same thing but in a much nicer tone. By phrasing the concern as a question, it invites the team to respond with their plans to lower the CG of the robot. If the team truly didn't plan for this, they get the information needed to know it's an issue, and if the team did plan for this, they're able to respond with their plans for doing so.

06-02-2017 22:18

Gravity

Re: pic: Titanium Tomahawks 2170 Teaser

Awesome looking robot, best of luck to your team!

06-02-2017 22:58

1493kd

Re: pic: Titanium Tomahawks 2170 Teaser

I will be interested in seeing how often teams end up "feeding" great high goal shooting robots at events. I can see it happening frequently later in the season by robots that are great at collecting balls as they do gear trips and can quickly feed alliance members. Will probably be the ideal 3rd pick by championship(s)- *climbing rope and placing gears obv. included in that set of skills

Good luck interested to see how it works out

Yesterday 01:11

Akash Rastogi

Re: pic: Titanium Tomahawks 2170 Teaser

It will peel on PVC. We figured that might be an issue but we wanted to try it out anyway. Gonna go to our non-experimental roller grip if it continues to peel. Just thought it was neat to try something new

As for feeding other bots, we're really hoping we get to a-bomb into a few bits! We purposely built a waterfall intake so we could also hold balls in the conveyor Incase we want to just reverse it to feed others.