OCCRA
Go to Post I think one of they beauties of the program is how it can include so many different interests our students have. - Doc Wu [more]
Home
Go Back   Chief Delphi > CD-Media > Photos
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

photos

papers

everything



4613 Offseason Minibot #1

pilleya

By: pilleya
New: 07-11-2017 07:22 AM
Updated: 07-11-2017 07:22 AM
Views: 1298 times


4613 Offseason Minibot #1

The Barker Redbacks first offseason project, a minibot built over the past few months for the Australian Duel Down Under Offseason competition.

Without bumpers the robot is approximately 19x16x15" and 32lb.

Please keep all questions/discussion in this thread.

Recent Viewers

Discussion

view entire thread

Reply

07-11-2017 09:45 AM

marshall


Unread Re: pic: 4613 Offseason Minibot #1

Can we get a pic next to a banana for scale? Or maybe a koala?



07-11-2017 09:46 AM

notmattlythgoe


Unread Re: pic: 4613 Offseason Minibot #1



Is there any video of this on the field with other robots?



07-11-2017 09:52 AM

TheBoulderite


Unread Re: pic: 4613 Offseason Minibot #1

Aw, what a cute little robot.



07-11-2017 09:55 AM

pilleya


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by notmattlythgoe View Post
Is there any video of this on the field with other robots?
The competition was livestreamed and the footage is available here:

Day 1( Practice)

Day 2( Quals)

Day 3( Quals+Elims)

Here is some footage of the robot in action, listen to the great commentary if you can!

Day 3 1:12 in (thanks Matthew)

Day 3 2:36 in



07-11-2017 10:10 AM

Thayer McCollum


Unread Re: pic: 4613 Offseason Minibot #1

It looks really fun to drive! How fast does it go?



07-11-2017 10:10 AM

EdgarAlenPoe


Unread Re: pic: 4613 Offseason Minibot #1

It's so small, how does it even fit a control system?



07-11-2017 10:19 AM

pilleya


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by Thayer McCollum View Post
It looks really fun to drive! How fast does it go?
Drivetrain Specs:

-Single CIM per side( 2 total)

-12:40 reduction

-3.5" Colsons wheels(4)

-9mm belt to outer wheels

-Geared for 25fps



07-11-2017 10:22 AM

notmattlythgoe


Unread Re: pic: 4613 Offseason Minibot #1

OMG ITS SO CUTE



07-11-2017 10:38 AM

fergus180


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by EdgarAlenPoe View Post
It's so small, how does it even fit a control system?
Well with difficulty the pdp is underneath the battery mount. The motor controllers are sort of spread wherever there was room so mostly next to the pdp on the left and right (there only needs to be five) the VRM fits on top of one of the drive tubes along with the radio. The roborio was then strapped on top of the battery in a protective case we had made for our comp bot. of course there was no room for pneumatics so we didnt have to worry about them.


Sorry for the low quality.



07-11-2017 11:43 AM

JesseK


Unread Re: pic: 4613 Offseason Minibot #1

How many times did your drivers lose it in traffic during elims?



07-11-2017 12:48 PM

TheBoulderite


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by notmattlythgoe View Post
DAWWWWWW!!!!!!!!!! WOOK AT THAT WIDDLE WOBOT!!!!!!!!!



07-11-2017 01:35 PM

araniaraniratul


Unread Re: pic: 4613 Offseason Minibot #1

Holy $@#$@#$@#$@#, I thought our 58lbs 24x24 was a little bit nuts. This is sooo coool!



07-11-2017 02:03 PM

gorrilla


Unread Re: pic: 4613 Offseason Minibot #1

Sneaky boy



07-11-2017 02:08 PM

Ryan Dognaux


Unread Re: pic: 4613 Offseason Minibot #1

What a cool off-season project! You really need to watch the match to see just how small it is, fantastic.



07-11-2017 02:11 PM

bbensel


Unread Re: pic: 4613 Offseason Minibot #1

I think my new favorite thing is watching it zip across the field at 2x speed. That and watching it climb.



07-11-2017 02:26 PM

Leap


Unread Re: pic: 4613 Offseason Minibot #1

I want five of these for a tiny robot army.



07-11-2017 03:13 PM

RoboChair


Unread Re: pic: 4613 Offseason Minibot #1

Copy Cats >_>



07-11-2017 03:17 PM

Aren_Hill


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by RoboChair View Post
Copy Cats >_>
What was that Devin? hmm?


(I love that this robot exists and think you should ship it up to Chezy Champs, and by ship it, I mean carry on luggage)

-Aren



07-11-2017 03:21 PM

RoboChair


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by Aren_Hill View Post
What was that Devin? hmm?


(I love that this robot exists and think you should ship it up to Chezy Champs, and by ship it, I mean carry on luggage)

-Aren
But that was your Season robot. But I do like this bot. Great learning experience in Engineering.



07-11-2017 03:41 PM

frcguy


Unread

Quote:
Originally Posted by Aren_Hill View Post
What was that Devin? hmm?


(I love that this robot exists and think you should ship it up to Chezy Champs, and by ship it, I mean carry on luggage)

-Aren

Dude... this one actually fits in a Vex sizing box...



07-11-2017 04:29 PM

Justin Foss


Unread Re: pic: 4613 Offseason Minibot #1

This is awesome. Any chance you'd be willing to post the CAD up online?



07-11-2017 04:46 PM

ollien


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by pilleya View Post
Drivetrain Specs:

-Single CIM per side( 2 total)

-12:40 reduction

-3.5" Colsons wheels(4)

-9mm belt to outer wheels

-Geared for 25fps
What's the gearing on the climber? Is that 2x2 box tubing I spy on the drive rails?



07-11-2017 05:06 PM

Jjmase123


Unread Re: pic: 4613 Offseason Minibot #1

I love this mini-bot. Just imagine if 2015's rules were still in play ... all the mini bots. While you're at it, why not make another mini-bot, this time with swerve. That would be pretty awesome. I already wanna make one like this



07-11-2017 08:15 PM

414cnewq


Unread Re: pic: 4613 Offseason Minibot #1

Specs on Intake?



07-11-2017 08:38 PM

pilleya


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by ollien View Post
What's the gearing on the climber? Is that 2x2 box tubing I spy on the drive rails?
-Climber is a 775pro geared 30:1 with a 1.25" spool( about 1.375" after velcro)

-Good catch, the drive rails are 60x50x3mm tube. These drive rails contain the 12:40 gear reduction as well as room for 9/15mm belts.

Quote:
Originally Posted by 414cnewq View Post
Specs on Intake?
-12mm Polycarbonate sides

-3mm Polycarbonate spatula

-BAG with a 12-48t GT2/3 reduction powering 2-3/8 in T40 wheels( they slightly compress which is nice).

-Raised and lowered by a BAG+VersaPlanetary using a dyneema cord winch with a limit switch at the top position.



07-12-2017 12:18 AM

EdgarAlenPoe


Unread Re: pic: 4613 Offseason Minibot #1

This is actually now my favorite robot design.



07-24-2017 07:41 PM

s_forbes


Unread Re: pic: 4613 Offseason Minibot #1

How much did this robot end up weighing without bumpers or battery?

EDIT: Oh, I should read the first post. 32lbs. If you take off two pounds, could you go through a competition season without ever bagging a robot?



07-24-2017 07:53 PM

pkrishna3082


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by s_forbes View Post
How much did this robot end up weighing without bumpers or battery?

EDIT: Oh, I should read the first post. 32lbs. If you take off two pounds, could you go through a competition season without ever bagging a robot?
I mean you could maybe squeak by if you didn't put some of the electronics on until competition (as they are COTS parts). That should reduce the weight to just below 30 lbs.



07-24-2017 07:59 PM

EricH


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by pkrishna3082 View Post
I mean you could maybe squeak by if you didn't put some of the electronics on until competition (as they are COTS parts). That should reduce the weight to just below 30 lbs.
Electronics can be pretty light. There's a (mildly) easier method.

Pull the intake, disassemble into COTS parts. Toss the custom parts into the withholding bin with the rest of the robot.

BAG+Versaplanetary+wheels ought to be about 2 lb. If that doesn't do it pull the climber motor and do the same thing. If you can get them both together in about an hour (with some practice) you're pretty much golden.



07-24-2017 09:32 PM

Thayer McCollum


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by pkrishna3082 View Post
I mean you could maybe squeak by if you didn't put some of the electronics on until competition (as they are COTS parts). That should reduce the weight to just below 30 lbs.
Now I really want to try this.



07-24-2017 10:25 PM

pkrishna3082


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by EricH View Post
Electronics can be pretty light. There's a (mildly) easier method.

Pull the intake, disassemble into COTS parts. Toss the custom parts into the withholding bin with the rest of the robot.

BAG+Versaplanetary+wheels ought to be about 2 lb. If that doesn't do it pull the climber motor and do the same thing. If you can get them both together in about an hour (with some practice) you're pretty much golden.
You're probably right. And it would probably be easier to take off the gear intake than the wedged-in electronics.



07-24-2017 10:46 PM

s_forbes


Unread Re: pic: 4613 Offseason Minibot #1

Just for fun, suppose a team built this robot for 2017 and the complete robot did end up being under the withholding allowance weight limit. If they qualified for championships, do they need a crate? ALL teams attending the FIRST Championship MUST have a crate to ship their robot in and MUST ship their robot to the FIRST Championship. Do they have to construct a small 5"x5"x5" wooden box to hold an empty locked bag, or can they mail it in an envelope?

If they don't have to wait to unbag the robot (er, "withholding parts") can they jump right onto the practice field while everyone else unbags?

If they bring an extra robot to each of their regionals as part of the withholding allowance, and add each one to the bag when they leave, can they show up to championships with 4 complete robots in their pit? Drive them on the practice fields while the real one is in a match? Cheesecake?



07-24-2017 10:51 PM

EricH


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by s_forbes View Post
If they bring an extra robot to each of their regionals as part of the withholding allowance, and add each one to the bag when they leave, can they show up to championships with 4 complete robots in their pit? Drive them on the practice fields while the real one is in a match? Cheesecake?
That would be a problem under C04, better known as the "Only One Robot" rule.



07-24-2017 11:08 PM

marcusbernstein


Unread Re: pic: 4613 Offseason Minibot #1

217-4048 (Colson Performa 3.5" x 1.25", 1/2" Hex bore) - 0.32 lb

The weight of your 4 wheels alone adds up to 1.28. Taking off an intake or climber piece or taking them apart is kinda risky and could be time consuming. Popping off 8 shaft collars and bearings saves you another .576. At that point, pulling off your drive shafts and cutting them (maybe even 1/2) on a pit bandsaw at the event seems to be the next move to save ballpark 2 pounds.

There are a number of cool solutions to this problem, and I'm sure if 4613 cared enough they could shave 2+ pounds off this bot permanently.

Either way, awesome job!



07-24-2017 11:11 PM

s_forbes


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by EricH View Post
That would be a problem under C04, better known as the "Only One Robot" rule.
Oh, right, I meant to say "can they show up to championships with 4 complete fully constructed sets of spare parts in their pit?"

I remember 1519 first striking this issue, and another team more recently that put a practice robot in the bag with the comp robot (can's seem to find that via search). It's a fun rule. Having a robot lighter than the withholding allowance makes it even more fun! You could call your robot Theseus.



07-24-2017 11:24 PM

EricH


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by s_forbes View Post
Oh, right, I meant to say "can they show up to championships with 4 complete fully constructed sets of spare parts in their pit?"

I remember 1519 first striking this issue, and another team more recently that put a practice robot in the bag with the comp robot (can's seem to find that via search). It's a fun rule. Having a robot lighter than the withholding allowance makes it even more fun! You could call your robot Theseus.
What makes 1519's case interesting is the definition of robot that year. The definition's been adjusted since, and makes life a lot more difficult on those wishing to attempt this strategy.

Unfortunately, Mr. R.A. Observer* has made his appearance, summoned by C04 itself, and would say that that's 4 robots in the pit, not 4 complete fully constructed sets of spare parts in their pit**. (And trust me, I've seen teams try to bring in spare-parts-robots before, out of bag--one got a talk from the LRI after two experienced inspectors saw it, the other got turned back at the door, something about "didn't you already bring your robot in?")

*Reasonably Astute, in case you were wondering about the initials. If I'm not mistaken, Robot Inspectors are considered to be reasonably astute (unless they catch something that you consider to be legal but they consider to be not).
**I would suppose that if the frame and the electronics and the various other components were disassembled to some degree at the time of observation, save on the competition robot, it could be argued that the team had 1 robot and 3 sets of spares that were not yet together but could be together in time to run another match.



07-24-2017 11:26 PM

Bluman56


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by s_forbes View Post
Oh, right, I meant to say "can they show up to championships with 4 complete fully constructed sets of spare parts in their pit?"

I remember 1519 first striking this issue, and another team more recently that put a practice robot in the bag with the comp robot (can's seem to find that via search). It's a fun rule. Having a robot lighter than the withholding allowance makes it even more fun! You could call your robot Theseus.
I believe that would be the notorious white and black striped Zebracorns, the bane of all FRC Manual authors in existence.



07-24-2017 11:30 PM

marcusbernstein


Unread Re: pic: 4613 Offseason Minibot #1

In reading 1519's story and thinking about some other more recent games, what would you all (and Eric specifically) think about a design where you could switch the superstructure of your bot on the same drivetrain? Many team's superstructures alone (especially in tall games) look like robots standalone, but if designed such that it was all under 120 lbs and all of the primary electronics components were on the drive base, I'd argue that legally that situation wouldn't be much different than for example 2016 mechanisms that were switched if the portcullis or CDF were on the field. That said, bigger attachments like those I'm describing could easily be seen as robots on their own.

Quote:
Originally Posted by EricH View Post
What makes 1519's case interesting is the definition of robot that year. The definition's been adjusted since, and makes life a lot more difficult on those wishing to attempt this strategy.

Unfortunately, Mr. R.A. Observer* has made his appearance, summoned by C04 itself, and would say that that's 4 robots in the pit, not 4 complete fully constructed sets of spare parts in their pit**. (And trust me, I've seen teams try to bring in spare-parts-robots before, out of bag--one got a talk from the LRI after two experienced inspectors saw it, the other got turned back at the door, something about "didn't you already bring your robot in?")

*Reasonably Astute, in case you were wondering about the initials. If I'm not mistaken, Robot Inspectors are considered to be reasonably astute (unless they catch something that you consider to be legal but they consider to be not).
**I would suppose that if the frame and the electronics and the various other components were disassembled to some degree at the time of observation, save on the competition robot, it could be argued that the team had 1 robot and 3 sets of spares that were not yet together but could be together in time to run another match.



07-24-2017 11:38 PM

EricH


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by marcusbernstein View Post
In reading 1519's story and thinking about some other more recent games, what would you all (and Eric specifically) think about a design where you could switch the superstructure of your bot on the same drivetrain? Many team's superstructures alone (especially in tall games) look like robots standalone, but if designed such that it was all under 120 lbs and all of the primary electronics components were on the drive base, I'd argue that legally that situation wouldn't be much different than for example 2016 mechanisms that were switched if the portcullis or CDF were on the field. That said, bigger attachments like those I'm describing could easily be seen as robots on their own.
Swapping superstructures? Sure, no problem, as long as they're all within 120 lb or you get reinspected every single time you change one, and all other rules are met. The drivebase would handily satisfy most of the requirement to be a robot, you're just changing what it can specifically do in that match.



09-03-2017 06:53 PM

Skyehawk


Unread Re: pic: 4613 Offseason Minibot #1

Quote:
Originally Posted by s_forbes View Post
Just for fun, suppose a team built this robot for 2017 and the complete robot did end up being under the withholding allowance weight limit. If they qualified for championships, do they need a crate? ALL teams attending the FIRST Championship MUST have a crate to ship their robot in and MUST ship their robot to the FIRST Championship. Do they have to construct a small 5"x5"x5" wooden box to hold an empty locked bag, or can they mail it in an envelope?

If they don't have to wait to unbag the robot (er, "withholding parts") can they jump right onto the practice field while everyone else unbags?

If they bring an extra robot to each of their regionals as part of the withholding allowance, and add each one to the bag when they leave, can they show up to championships with 4 complete robots in their pit? Drive them on the practice fields while the real one is in a match? Cheesecake?
This is now right up there with some of my favorite posts on CD.



view entire thread

Reply
previous
next

Tags

loading ...



All times are GMT -5. The time now is 12:12 PM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi