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Poll: Drivetrain this year
What's your drivetrain going to be this year?
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Re: Poll: Drivetrain this year
I put Nonadrive, even though technically it'll be a Decadrive. I'm happy to see that most teams are going with a tank drive.
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Surprisingly team 639 will not be going for treads this year, as that is our signature drive train. We will be doing a 6-wheel west coast drive.
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My team developed a West coast Drive platform over the summer so we decided to try it for once since up until last year, I believe my team has used almost all mecanum. I wish we would have developed a swerve drive because I have a feeling one of the winning robots at Worlds this year will have a swerve drive.
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Re: Poll: Drivetrain this year
Yeah, it's good to see that there are a lot of tank drives here. You really need to know what you're doing to make any other drivetrain, and do it well enough that you avoid the negatives associated with it. For example, mecanum is really easy to slap on any robot, but you need to have a lot of practice, some decent custom programming to keep the strafing straight, and the right gearing so that you aren't knocked around by all of the basic pushbots.
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Re: Poll: Drivetrain this year
The results of this poll are terrifying.
Am I Karthik now? |
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Re: Poll: Drivetrain this year
At least a lot of driving practice will help you avoid such situations. And you might win against standard AM pushbots, probably not against anything like the Vex WCD or a custom solution.
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What's terrifying about so many teams doing tank? |
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Personally, I'm not concerned by any results of this poll... looks reasonably good. ~70% tank, ~30% omni-directional, with a good mixture of types to fit various teams' resources, strategies, and preferences. |
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I think the biggest thing this poll indicates is how different CD is from the entire FRC community. I say that because, at the time of my posting, there are 16 teams doing swerve and 17 doing mecanum. I guarantee you that the average competition won't have an equal number of mecanum and swerve drives.
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Re: Poll: Drivetrain this year
Swerve isn't a bad drivetrain to go with, mainly because you really need to know what you're doing to implement it. Definitely not as worrying as the number of mecanum teams.
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The disappointing thing is I tried to convince the team I'm working with that Mechanum would probably be a bad idea. However they didn't seem to reach my conclusion. They have 3 years of FRC mechanum experience that wasn't necessarily bad and 3x that experience using mechanum in Vex. So maybe it won't go over that badly...maybe...
save me... |
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*mecanum |
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*Shortcut to properly interpreting CD polls: don't. |
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Still, now we have 10%ish of teams going mecanum. That is worrying.
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Remember folks, CD is not a representative sample of the FIRST community. |
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I have an Einstein worthy idea... Swerve drive that uses mecanums. On top of that you should use mecanums as a flywheel. 100 percent guaranteed to win.
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The results of this poll aren't terrifying. |
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He says as he designs a mecanum drive. |
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Mecanum will be great they said. Make your robot better they said.
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Re: Poll: Drivetrain this year
We were going to do omnis on a swerve drive, but backed down a notch. We're going to mount those omnis on a twitch drive. In addition to strafe capabilities, when driving forward we can rotate the twitch to achieve what is effectively a CVT (continuously variable transmission).
Seriously, we're doing 2/3 of a kit chassis, geared a bit faster. Driver practice should get the cycle time down farther than tweaking the drive train. |
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Tank.
We had built a mecanum and a tank in the off-season a few times to give the younger folks on the controls and programming teams some more practice. Our half practice field was done a few days ago, so we fired each of them up and had a new student driver try them out. There was little difference in his ability to maneuver around the field (including other robots) and line up to the spring, hopper, and loading stations with tank versus mecanum after a few minutes practice with each. Our graduated driver with mecanum and tank experience tried also and agreed. We would prefer a swerve, but we aren't there yet, so it's not a consideration. |
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(Reference) Also: Yes, mecanums are horrendously underpowered and virtually uncontrollable when defended in any way. |
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Although they are the perfect team to cite when discussing the potential that mecanum drives have. That potential can't be unlocked in a single season however. The reason 2052 is so good at mecanum is black magic*. They do things with mecanum drivetrains that I think only they're capable of. Also, 2013 was more conducive to a mecanum drive because you could set picks for yourself by driving under the pyramid. This year, you're forced to push through defense, or go all the way around the Airship. *and endless tweaks, refinements and improvements throughout the years, tons of drive practice, and great driving tactics/strategy. |
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I completely don't understand that line of reasoning, Ryan. We should discount this example because it was performed by a team that was good at it? Also, the claim was never made that any drive train is "good for everybody".
For the record, once again, I am neutral on the mecanum drive discussion. For some circumstances, it is a decent choice; for others, it is not. Sometimes a claw hammer is really nice; other times it's completely inappropriate. What I am against is the folks who disparage mecanum drive on the face of it being mecanum drive. Save that hatred for scissorlifts. |
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I definitely just misread your post! My bad, you weren't saying that mecanum is good for everybody... not sure how I read it that way the first time! |
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I don't have a video link yet, but 2996 in 2014 used mecanum to good effect, and were first pick for the second alliance in Utah, which went on to win the event. We practiced with them quite a bit, and were very impressed. When it was all over, I remember talking to drivers and mentors, and hearing them say that, even with their win, they wished that they hadn't done mecanum.
I guess my point is that throwing shade at mecanum (or other drive types) is overgeneralizing. An effective bot can be made many ways. Still, it's usually (maybe almost always) a better idea to give tank a shot before dismissing it for a flashier omnidirectional drive style. |
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