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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Motors: my go-to combination is 4 CIMs & 2 MiniCIMs. Gearing: I am usually an advocate for single speed gearboxes, and I still think you can't go wrong with them this year. My issues with shifters is that most teams are not able to fully realize the benefits of their shifting gearbox; whether that's because of poor design, a game that doesn't need two-speeds, insufficient driver practice or just mistakes in the engineering process, they're adding weight, cost and complexity and not getting much in return. However, this year is a good year for shifting gearboxes if you go that route. you have long open stretches of field you need to get across quickly and you have tight spaces where you need to push defenders out of the way. I have not done any of the math yet to really figure out sprint distances and distance to reach full speed, so I'm just guessing on the numbers themselves. But for this game, I'd say: 12 ft/s for a single speed gearbox 8 & 14 ft/s for a two-speed gearbox. |
Re: 2017 Drive Train
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You're right, 45 lbs. is much more reasonable and your chassis looks both agile and powerful. I expect you'll see a lot of success on that that chassis. But the reason I always will recommend a simple 6 or 8 wheel drop center chassis over the more complicated drive systems is that a well designed, well built, and well practiced tank drive will perform as well as something more complicated for most cases. Yes, there are situations in which it'd be really convenient to just move 6" to the left in a match. But those scenarios are not worth the time and effort that those more complicated drive systems require. And the robustness of a tank drive cannot be beaten. In short, I think it's more important for teams to field the best robot and not the best drivetrain. Any time spent on a complicated drive system is time not spent developing other subsystems. |
Re: 2017 Drive Train
Speaking of drive train, we finally came up with the drive train we are going to use for this year. We were deciding between skid steer and mechanum and I was for skid steer. However, the main mentor already ordered the parts for mechanum. We're still deciding on our robot design, but at least we have a drive train. :)
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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Re: 2017 Drive Train
Our team is building both an omni and the KOP drivetrain this year and making them the same dimensions with the same opening location for ball retrieval. The plan is to use the omni, but with the backup option of the KOP DT.
Are we allowed to switch out drive trains at the competition if the need arises? If so, would both drivetrains need to be included in our 120 lbs? Do we need to come to the competition with the second drive train un-assembled? |
Re: 2017 Drive Train
Bumping the thread to ask, "Our team was driving and finding alignment time issues with the feeder station and gear deployment station, we are using the AM14U2 chassis in the 6 wheel configuration. Is H-drive worth is to overcome the drive practice required to become efficient at loading?" Our team has not built it before, and I am curious as to how difficult it is with the standard chassis.
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Re: 2017 Drive Train
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Re: 2017 Drive Train
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On another note: I'm very happy that 4607 built a Butterslide drive with 4" omnis and 2" custom traction wheels. We're essentially duplicating that drivetrain with some useful improvements. Being able to strafe while also having the ability to resist pushing while scoring is going to be so useful. If we hadn't built that drivetrain in the offseason there's no way we could've done it during the build season! |
Re: 2017 Drive Train
Our team decided to go with a 6 wheel tank drive this year, with a sort of modified west coast style. We have a frame CAD model attached and would love to hear what you think.https://drive.google.com/file/d/0BzJ...ew?usp=sharing
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