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-   -   pic: 2009 Mecanum Hub - Team 1595 (http://www.chiefdelphi.com/forums/showthread.php?t=69877)

willson.thomas 04-11-2008 09:37

pic: 2009 Mecanum Hub - Team 1595
 

JesseK 04-11-2008 09:38

Re: pic: 2009 Mecanum Hub - Team 1595
 
Hope you're ready to re-CAD it from scratch on kickoff day :ahh:

I'm having trouble visualizing the full wheel, any chance a photo of that could be posted? It seems like the rollers would interfere with the roller-mount supports (the angled struts coming off of the roller mount flanges).

NickE 04-11-2008 09:49

Re: pic: 2009 Mecanum Hub - Team 1595
 
Quote:

Originally Posted by JesseK (Post 773739)
Hope you're ready to re-CAD it from scratch on kickoff day

Quote:

Originally Posted by R27
Prior to the Kick-off: Before the formal start of the Robot Build Season, teams are encouraged to think as much as they please about their ROBOTS. They may develop prototypes, create proof-of-concept models, and conduct design exercises. Teams may gather all the raw stock materials and COTS COMPONENTS they want. But absolutely no fabrication or assembly of any elements intended for the final ROBOT is permitted prior to the Kick-off presentation

According to Rule R27 from 2008, you can CAD all you want before build season, as long as nothing gets built. Unless this rule changes, having this CADed now shouldnt be an issue.

JesseK 04-11-2008 09:57

Re: pic: 2009 Mecanum Hub - Team 1595
 
The paragraph above <R27> states the spirit of the rule. Though it's not 'technically' a rule, it's still in the rulebook and still explicitly governs as such: (emphasis is mine)

Quote:

Teams can not be prevented from thinking about their hardware and software designs, and it is not our intention to do so. However, the timeline permitted for the development of the actual competition version of the ROBOT is severely, and intentionally, restricted. Pondering software issues to be resolved, researching general case solutions, discussing solutions with teammates, collecting raw materials, sketching mechanisms, preparing tools, and outlining high-level descriptions of software algorithms are all reasonable activities outside of the scheduled build periods. But completing detailed dimensioned drawings of parts, and any actual fabrication of any hardware items intended to go on the actual competition ROBOT is prohibited outside of the approved fabrication periods.
I do not mean for this to take away from the discussion of the design itself, and apologize for that :o

KINGOFCLUBS454 04-11-2008 10:10

Re: pic: 2009 Mecanum Hub - Team 1595
 
Rules aside, that is a beautiful looking hub, I can't wait to see it with rollers. I noticed you had some extra support between the spokes, what's your reasoning behind that?

Lowfategg 04-11-2008 10:57

Re: pic: 2009 Mecanum Hub - Team 1595
 
Those are very cool looking. Hope you can find someone to machine them.

Is not andymark going to release an updated version of the mecanum wheels this year? I know a lot of teams did not like the thin sheet the old ones are made of.

EricH 04-11-2008 11:11

Re: pic: 2009 Mecanum Hub - Team 1595
 
Rules aside (as you can argue either way), there is one other issue. Mecanum is cool, but don't make design decisions before Kickoff. You don't know what the game is, or if mecanums are going to be a good option. (Or even if you can get that 5-axis CNC...) If you lock in now, you may easily be at a competitive disadvantage come competition.

Dan Richardson 04-11-2008 13:13

Re: pic: 2009 Mecanum Hub - Team 1595
 
:yikes: Pretty! Do you have any back up solutions if you don't gain access to a 5 axis cnc?

And as far as I understand the intent of the rule and clarifications last season, if you were to make the drawings publicly available on Delphi white papers or any other viable source, then you would be able to use the same drawings. ( I.e. nothing but dewalts )

AustinSchuh 04-11-2008 16:35

Re: pic: 2009 Mecanum Hub - Team 1595
 
Any reason you are using a key instead of hex?

dlavery 04-11-2008 17:01

Re: pic: 2009 Mecanum Hub - Team 1595
 
Quote:

Originally Posted by Stud Man Dan (Post 773787)
:yikes: Pretty! Do you have any back up solutions if you don't gain access to a 5 axis cnc?

Of course, that may be a moot point if the new "no metal parts allowed" rule stays in play... :rolleyes:


-dave



.

EricH 04-11-2008 17:41

Re: pic: 2009 Mecanum Hub - Team 1595
 
Quote:

Originally Posted by dlavery (Post 773833)
Of course, that may be a moot point if the new "no metal parts allowed" rule stays in play... :rolleyes:


-dave



.

They'll just use wood, if it's strong enough. Of course, at that point, the "freshman on a wood platform" is probably the best robot, as the controllers won't be allowed.:D

IKE 04-11-2008 18:50

Re: pic: 2009 Mecanum Hub - Team 1595
 
Quote:

Originally Posted by dlavery (Post 773833)
Of course, that may be a moot point if the new "no metal parts allowed" rule stays in play... :rolleyes:


-dave



.

Okay Dave,
I think I have the structures, motors and the power source worked out. The controls are going to be very interesting though. May have to check out a "Idiot's Guide to Programming with Rope" from the Library in Alexandria.

willson.thomas 04-11-2008 19:08

Re: pic: 2009 Mecanum Hub - Team 1595
 
I have just uploaded the hub with the rollers finished. If we do not get a 5-axis we will just use our previous mecanum design. We have had mecanums for the past three years. This is just a significantly lighter way of creating them. Will post pics of old ones soon.

We are in no way locking ourselves into these hubs. We will not request them to be manufactured until after we know the challenge and have evaluated the advantages and disadvantages. For overdrive we seriously considered not using them, but decided the maneuverability we would gain we more than make up for the speed loss when trying to pick up the ball.

Andrew Schreiber 04-11-2008 19:14

Re: pic: 2009 Mecanum Hub - Team 1595
 
Quote:

Originally Posted by IKE (Post 773852)
Okay Dave,
I think I have the structures, motors and the power source worked out. The controls are going to be very interesting though. May have to check out a "Idiot's Guide to Programming with Rope" from the Library in Alexandria.

You know, I have a copy of that book in my room, I was going to go with Pigeon over IP protocol personally ^_^

Seriously guys, gorgeous wheels. Would you really need a 5 axis cnc mill to get them done? If you accept that the interior wont be as pretty you could do them with a mill by hand. But hey, if your sponsor wants to make em for you I say what better advertising for them eh?

RyanCahoon 04-11-2008 19:18

Re: pic: 2009 Mecanum Hub - Team 1595
 
Nah... we'll just program dna and rat brains to control the robots this year.

Completely organic game: First alliance to eat all the food items on the field wins. :ahh: Of course some teams will opt for herbivores, some carnivores. Rule: no eating the other robots.

Better start working on getting those biomedical sponsors...


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