There seem to be very few robots this year handling Cargo with a basket, or a bucket. And they seem to be doing well.
I wonder why there aren’t more?
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It is very unreliable to depend on gravity, plus as my team found out wheels are amazing.
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You expect gravity to fail? Gravity is like one of the most reliable forces in nature…
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- Balls are bouncy.
- Robots carrying bouncy balls while under heavy attack will most likely lose them.
- Not as efficient as rolly-grabbers as rolly-grabbers are mainly for rounder and smushy objects.
I would recommend watching 1678’s Strategic Design workshops.
Yes. It is 1 hour long. But trust me, it is WORTH IT.
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It’s reliably a fairly weak force that pushes in one direction. If you want to move something sideways (like, say, scoring into a rocket or cargo ship), then you only get to use a small portion of g to move your game piece. Using rollers you can push the cargo quickly in the desired direction.
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I know it can’t possibly work, but still…watch this video from 0:50 seconds to 1:20
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I wish we did better, don’t know if the bucket took much blame. Cargo was our highest skill. But I think we would struggle more with heavy defense without the cargo being held in place. We are reconsidering a lot post season and I don’t know if the simple bucket will make the cut. I liked the rollers that 1730 was using, so we may look to dump the bucket for more control. It probably isn’t fair to the bucket, but we didn’t spend much time working on it. Especially, the controls were limited after our bucket sensor converter stopped working. So the bucket relied a lot on operator skill.
That’s a well implemented bucket/basket design, but I can’t help but wonder what happens when you take a hit from a defender. Does the cargo stay in the bot?
That shows you the weakness. It can ONLY take cargo from the loading station and not from ground. There are a minimum of 12 on the field on the ground already. There is 5 at each loading station. (Sometimes i saw 6 at my regionals???) And then, defense.
We lost one that I know of in Colorado, could be a couple that I missed. We added the Lexan “fingers” after the Az N regional, because we were losing a lot of balls there, both in loading, and from defense.
Keep in mind that this basket was invented and designed and built in a couple days by a couple students who don’t have much experience at this stuff…but it also took our team 4 weeks to realize that we had to come up with something simple, because the roller thing just wasn’t coming together.
I’m just really surprised that hardly any teams are using the dumping concept. 7671 has a bucket, that got them a really high ranking. And I was really surprised that we got a #2 rank in Colorado with this thing–although a big part of high rankings this year is the 3 point climb, which we also have.
It’s all very strange to me.
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I wish we did better, don’t know if the bucket took much blame. Cargo was our highest skill. But I think we would struggle more with heavy defense without the cargo being held in place. We are reconsidering a lot post season and I don’t know if the simple bucket will make the cut. I liked the rollers that 1730 was using, so we may look to dump the bucket for more control. It probably isn’t fair to the bucket, but we didn’t spend much time working on it. Especially, the controls were limited after our bucket sensor converter stopped working. So the bucket relied a lot on operator skill.
Look at 2:10 for a bucket fail.
ok Its not unreliable rather inaccurate
There are 6 on each side of the player station unless they are used for preloading on robots. So there are up to 12 available. The most we used in a single match was 9, but still, moving 9 cargo in a single match with something this simple is mind boggling.
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I bet your students learned a lot and WILL be more willing to help next year. 
Personally, i think the earlier you get students to do things themselves and put it on the robot, they get more motivated in the long-term.
I’ve participated in FRC long enough to know that gravity only works in ways you don’t want it to, and never seems to work when you try to incorporate it into your design.
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A rookie team made it all the way to lead the #2 alliance to finals at NC Wake this year, using a bucket mechanism that was literally a metal bucket from the hardware store. It was highly effective and very difficult to dislodge once the cargo was in it. Maybe as a rookie team they didn’t know the accepted wisdom about such things and let what worked be their guide instead.
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The bucket/chute is a great design for teams who don’t have the resources to make an effective roller based Cargo mechanism. It obviously doesn’t have the same high end potential as active mechanisms, but as proved in 2017, sometimes you can not only get away with a passive mechanism, but you can excel with it. I’ve seen many robots this season with unreliable roller based systems, which would have been much better off with something simpler and similar to a bucket. It’s not the right choice for every team, but it’s certain the right choice for some teams.
Simple is not a bad thing, despite what many people will tell you.
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Not gravity per se, but there’s no guarantee as to what direction gravity will be pushing with respect to your robot.
I did see a few of these last week.
- 5965 had a plastic bucket that didn’t hold the cargo firmly enough; they had some trouble getting them loaded, and even more trouble holding onto them in collisions.
- 6103 had an awesome looking metal (stainless?) bucket that looked like a custom-welded stock pot and did somewhat better. It also could only receive cargo from the loading station.
Another issue with buckets is that they are more sensitive to variation in CARGO inflation than are wheeled intakes and claws.
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Team 7486 did it because we were short on funds and low on time. We were able to end up as the 8th seed after Quals and the #5 Alliance by focusing on cargo (We could do both) even though we had no driver practice until our first Qualifier match.
I like the simplicity and effectiveness of the cargo baskets.
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2521 has a polycarb bucket, and we love it. It’s super simple (one pneumatic piston) and integrates really nicely with our cargo pass-through and hatch claw. It’s also really, really light (bucket + hatch claw are all <5lbs).
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