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#91
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Re: Best Drivetrain
Quote:
. I didn't mean to imply that you were in particular, my apologies.On another note, and somewhat drivetrain related, does anyone have experience with using the Gates synchronous belting that has been supplied with the kit on a drivetrain? |
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#92
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Re: Best Drivetrain
See the post by Shan of 612 earlier in this thread.
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#93
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Re: Best Drivetrain
I like direct drive myself! Mainly because our linkage wouldn't work without it (generally... I suppose I could find a way.. but direct drive is the easiest way). That and because we don't have precison tools, tension is harder to maintain (it can be done, but is done much better with pecison)
We used all direct drive this year (4 omnis), those banebot transmissions have a nice long output shaft for that!! ![]() |
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#94
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Re: Best Drivetrain
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honestly there is little trouble from #25 chain besides tension, and there are plenty of easy solutions to tensioning the stuff, that require little more than a idler sprocket or delrin or something like that, and you probably wont need to tension that chain more than once, unless you go to multiple regionals and nationals and i double that many rookies are doing ALL of that. in other words #25 is perfectly sufficient for the purposes of a FIRST rookie team, and allows that extra 5 lbs to go towards something else more deserving |
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#95
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Re: Best Drivetrain
Quote:
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#96
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Re: Best Drivetrain
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So that was my 0.02$ ![]() |
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#97
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Re: Best Drivetrain
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Quote:
Last edited by Rick TYler : 01-05-2008 at 13:50. |
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#98
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Re: Best Drivetrain
To add to what Rick said: There were possibly rumored cases of this happening in the 2004 season. Size constant, build now, we'll do the manipulator later.
The result: Instead of 36" x 30", you now have to fit in a 38" x 28" box. If you try that and say that on here, there is a risk that the GDC will decide to change the sizing on you. The size has changed AT LEAST three times that I know of. Something small, 36" x 36", 36" x 30", and now 38" x 28". |
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#99
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Re: Best Drivetrain
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Anyway, I do thank you for the comment, I personally didnt know that and Its good to know. Its probably best not to educate the rookie teams to bend the rules.. |
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#100
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Re: Best Drivetrain
[quote=zivo123;744793]Oh cmon. The Robonauts are using the same compex mechanism for three years now (correct me if i'm wrong). I'm sure the didnt build the whole thing from scratch this year. And even if the did i know of a lot other teams doing that..
I would be interested in the list of all those other teams that you know about mike d |
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#101
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Re: Best Drivetrain
Quote:
But I am sure they do NOT use the same mechanism from year to year! We were all surprised when they unveiled the V6 in 2007. They improved it the next year. Oh, by the way, if you're going to accuse 118 of this, then you also need to go after the following: --254/968 (drive) --60 (drive) --25 (drive) --330 (most of the robot, 2005, 2007-2008) --16 (drive) --233 (arm and drive) You see my point? A lot of teams build on old designs. They don't necessarily use the same parts (which is also prohibited--no build pre-kickoff, and no re-using mechanisms from old robots). So I'm guessing that they just say, "Does this work for the game? If not, how do we change it?" and then re-engineer to optimize for the new game. They build in 6 weeks just like every other team. |
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#102
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Re: Best Drivetrain
Quote:
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#103
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Re: Best Drivetrain
once you build a drivetrain, it becomes very easy to build again from scratch, so although it may seem prebuilt (because they finish so fast) its not, its just they have all the resources set up to build something, all bugs were worked out on the other system, and all upgrades were prototyped.
I know for a fact it took us 3 weeks to build our Linkage drive during build season, and I know we could put another one together (given we have metal to do so) in about 4 days. Once you have a plan, things come together very easily. |
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#104
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Re: Best Drivetrain
Quote:
Your first assumption that is completely wrong is that they have been using the same mechanism each year. Look at their DT last year and this year....they are not the same, although they may accomplish the same result (swerve/crab drive that totally rocks) What else have you heard about other teams? I guarantee they build the entire thing in their given timeframe. You cannot make allegations with no support against other teams on this forum, its not fair to them, or to anyone else that cruises chiefdelphi because then someone has to take the time to explain to you how wrong you are about this. There is no rule in FIRST about tweaking an old design and using it again in a year, this is the advantage experience brings. |
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#105
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Re: Best Drivetrain
Quote:
Just because a team uses similar designs each year, doesn't mean they cheat. It means they have found a system that they find works for most games, and ways to implement it year after year successfully. And just because its complex doesn't mean it's cheating either. 118 has a history of technical proficiency, some of the best mentors, and very smart and dedicated students. I'd suggest you do a little more research before making such bold claims. |
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