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-   -   pic: Titanium Tomahawks 2170 Teaser (http://www.chiefdelphi.com/forums/showthread.php?t=154786)

Akash Rastogi 05-02-2017 16:26

pic: Titanium Tomahawks 2170 Teaser
 

ollien 05-02-2017 16:26

Re: pic: Titanium Tomahawks 2170 Teaser
 
Is that a 3d printed PVC pipe hex plug? Could I get the model for that?

Chris is me 05-02-2017 16:32

Re: pic: Titanium Tomahawks 2170 Teaser
 
Akash, you forgot the box!

Quote:

Originally Posted by ollien (Post 1640742)
Is that a 3d printed PVC pipe hex plug? Could I get the model for that?

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

D_Price 05-02-2017 20:13

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.

dodar 05-02-2017 20:23

Re: pic: Titanium Tomahawks 2170 Teaser
 
Seem some 2009*shudder* inspiration in this robot.

Sperkowsky 05-02-2017 20:48

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.

Billfred 05-02-2017 20:49

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by dodar (Post 1640818)
Seem some 2009*shudder* inspiration in this robot.

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.

1493kd 05-02-2017 21:09

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.

AcesJames 05-02-2017 21:15

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by D_Price (Post 1640812)
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.

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.

Quote:

Originally Posted by dodar (Post 1640818)
Seem some 2009*shudder* inspiration in this robot.

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

Quote:

Originally Posted by Sperkowsky (Post 1640828)
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.

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?

Quote:

Originally Posted by Billfred (Post 1640830)
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.

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.

Cothron Theiss 05-02-2017 21:31

Re: pic: Titanium Tomahawks 2170 Teaser
 
What're the black rollers made out of? It looks like continuous strand carbon fiber.

AcesJames 05-02-2017 21:33

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by Cothron Theiss (Post 1640844)
What're the black rollers made out of? It looks like continuous strand carbon fiber.

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

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

1493kd 05-02-2017 21:36

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"

AcesJames 05-02-2017 21:41

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by 1493kd (Post 1640848)
Does your "elevator ramp" drop down to "ground level"? How are you lifting ground fuel up to the "ramp"

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).

Sperkowsky 05-02-2017 21:42

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by AcesJames (Post 1640838)
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.

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.

frcguy 05-02-2017 22:17

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

D_Price 05-02-2017 22:39

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.

Quote:

Originally Posted by Akash Rastogi (Post 1640741)


Akash Rastogi 05-02-2017 23:01

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by Cothron Theiss (Post 1640844)
What're the black rollers made out of? It looks like continuous strand carbon fiber.

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!

cadandcookies 06-02-2017 03:36

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by AcesJames (Post 1640845)
The rollers are 2" diameter PVC and they're coated in liquid Flex Seal (as seen on TV).

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

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)?

Chris is me 06-02-2017 09:15

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by D_Price (Post 1640812)
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.

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.

Quote:

Originally Posted by dodar (Post 1640818)
Seem some 2009*shudder* inspiration in this robot.

Quote:

Originally Posted by Billfred (Post 1640830)
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.

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.

Quote:

Originally Posted by 1493kd (Post 1640835)
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.

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.

Quote:

Originally Posted by Sperkowsky (Post 1640828)
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.

Quote:

Originally Posted by Sperkowsky (Post 1640853)
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.

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.

Gravity 06-02-2017 22:18

Re: pic: Titanium Tomahawks 2170 Teaser
 
Awesome looking robot, best of luck to your team!

1493kd 06-02-2017 22:58

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by Chris is me (Post 1640988)

The floor also needs to be at a few different heights for the various outtake functions the robot can do.

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

Akash Rastogi 08-02-2017 01:11

Re: pic: Titanium Tomahawks 2170 Teaser
 
Quote:

Originally Posted by cadandcookies (Post 1640948)
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)?

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.


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