2 or 4 motor DR4B

  1. last week


    Nov 8 lemme think about it... 37409A

    So I have asked before about whether or not a 2 motor lift was a good idea for this game and, from what I could tell, I deemed the results underwhelming. I believe this was mostly due to my phrasing and/or my poor ability to present details in text form. So, all this aside, here is my new, rephrased and redone, question to ask you forum peeps.

    So, from what I have seen, all the stacking robots so far have been able to make it with 2 motor DR4B lifts as opposed to a 4 motor DR4B. I was amazed to see that the DELTA robot makes it by with only 2 motors and still maintains good lift speed with full c-channels and a "not-quite-so-small", very effective, intake. I have set my standard for cap bots with this awe-inspiring DELTA bot, but I am not quite so sure how anyone could go through with only a 2 motor DR4B this year with the heavier game objects, heavier intakes, and still maintain their lifting speed. What am I missing that allows other teams to do so well with 2 motor DR4Bs that our team wasn't even able to do last year with lighter game objects and such? (of course we were a first year team, but the only thing I see to help a possible lift is making it all-aluminum, as opposed to us having only 2 steel channels and everything else aluminum)

    Is there something I am missing? (better rubber banding, better lift planning, anything that could possibly allow us to make it by with a 2 motor lift this year)

  2. Got a Screw Loose

    Nov 8 Ohio 44833B

    Uh, this year's objects are significantly lighter than ITZ's comparable mobile goals. I don't quite remember, but I don't think caps are very different from cones. They may even be lighter. I just forget and don't want to look it up.

    Yes, your lift should be allumin. I've built lofts where the heaviest thing was the gears. Additionally, your intake doesn't have to be too elaborate. Unless you're feeling adventurous, start Simple and work your way up.

    2 motor lifts are definitely doable this year. Rubber bands are certainly helpful, and there are threads detailing how to use them. It's all about using a light gearbox with the minimum torque, resulting in maximum speed.

    Another mistake I made my rookie year was to put my lift motors on the base tower, rather than in the middle section. I had to transfer energy such a longer way than I had to.

    Another thing to watch out for is where you place your linkages. Putting them closer together allows for more reach, but it takes more torque to move it. It depends on how much space you have.

    If you have V5, a One motor lift is probably pretty doable.

    Pictures will help. The community tends to be more helpful with very specific problems, rather than a "Help, I need ideas" type post.

  3. Gameoa

    Nov 8 lemme think about it... 37409A

    This thread is simply trying to either start a discussion between doing either 2 motor or 4 motor DR4B, trying to find the pros and/or cons of each, or the see if there is a clear winner. From my view, seeing what happened last year with our DR4B [rubber-banded (the effectiveness of which is still up to discussion), all aluminum (except for where limited parts restricted our use of aluminum, which was only on two bars) , and with mid-section mounted motors as opposed to tower mounted motors] The only videos or images I have was our "joke" reveal from last year showing our lift's incapabilities (which were dealt with, but were exaggerated by the joke reveal). I simply put this conversation out here as a catalyst for a started a discussion for either side, with the end goal being, our team able to make up our mind about what to do about it.

    If you would like to see our last year robot "reveal" I would be happy to oblige, but I do not think there is much to gain from seeing it.

  4. While I don't have much to add. I would firstly recommend that if you are using 2 393 motors to power from supporting towers so the motors wont have to lift their own weight. Also I dont see a reason not to use aluminum everywhere.

  5. Mark Finley

    Nov 8 Las Vegas, Nevada 6891B - Kep's Boys

    If you are using V5 you can do a one motor dr4b, if you are using 393 you can also do a one motor dr4b it just has to be really carefully build and rubberbanded. Also your cap intake has to be pretty light, and it has to be a compact dr4b.

    Keep in mind with a dr4b you can not lift it outside of the expansion at all. With a 4 bar you can lift it a little. This should not matter if you use an active flipper.

  6. Gameoa

    Nov 8 lemme think about it... 37409A

    So this is supposed to be with 393s, I guess I failed my goal of getting a better detailed explanation, but anyways...

    And, just to be clear, im not saying there is a good reason not to use aluminum on a lift. I was simply saying that a limitation on parts prevented us from using aluminum for every single bar, in addition to the envy of other teams in our program, but we managed to get away with all aluminum except for just two bars.

    Keep in mind this is not so much about our team specifically, just mainly talking about what you need to do to achieve a two motor DR4B or if a 4 motor DR4B would we better. Really we are just trying to provoke general conversation here, not just a “oh hey do the thinking for us” type thing, and we hope that other teams, not just our own, and the teams that participate in the conversation will be able to learn something from this.

    You are free to bring up anything you deem necessary or specifically important to the conversation, it is meant to be fairly open-ended.

  7. Got a Screw Loose

    Nov 8 Ohio 44833B

    @Gameoa You are free to bring up anything you deem necessary or specifically important to the conversation, it is meant to be fairly open-ended.

    Hot dogs are sandwiches.

    But really though, a four motor would be inevitably faster, at the expense of using more power and two more motors that could've been used elsewhere. A two motor is totally viable, though not the best choice if you have the extra motors to spare.


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