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Thread: Heavyweight Drive System

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  1. #1

  2. #2
    Ocracoke's Avatar
    Team Kaizen

    For a relatively simple system, I known 800W scooter motors with sprockets and chains to be used to good effect which is relatively affordable. Beyond that, you could go with big CIM motors, NPC or Ampflow motors with gearboxes on them or even go brushless though they can be quite fiddly. In theory, wheelchair motors also work but they tend to be underpowered for this level I feel. Speed controllers, in terms of brushed motors, usually go along the lines of VEX BBs, RobotEqs and the like though I've known Cytrons to be used as well with a bit of modification.

    I do advocate reading the build diaries here, they are a wealth of information of what works and, perhaps more importantly, what doesn't.

    However, it is worth bearing in mind that to get a system that works and works well (that includes the motors, the gearing and the speed controllers and the batteries), it can get quite expensive and if you've never built a fighting robot of any description before, it's worth starting in a lighter weight class like Featherweights or Beetleweights simply because they are far cheaper to build and maintain plus, in my experience, they are easier to learn the basics with.

    For example, my Beetleweight I put together for about £75 I want to say (albeit with some components reused from other projects) but the axe motor and speed controller in my Middleweight easily cost will in excess of twice that alone. One of my Featherweight robots cost me ~£300, my first Middleweight was in the £700 region all told and that is before the cost of keeping them running.
    Last edited by Ocracoke; 12th October 2020 at 00:30.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

  3. #3

  4. #4
    Ocracoke's Avatar
    Team Kaizen

    Without knowing which combination of motor and gearbox they are talking about, I can't say. I tend to make my own gear reductions for my Middleweights drive (and will have to for my next big project as I talked about in my build diary). Each motor has its own characteristics and quirks.

    For example, the CIM motors I use seem to be fine being overvolted to quite a height with a 6.35:1 single stage reduction drive to the wheels using MOD 1.25 gears. That's fine for the weight it has to shift and for the application it is being used for but I wouldn't dream of using that same combination in a Heavyweight because of the extra weight. I am envisaging having double that reduction in my next project with A28-400 Ampflow motors though that does rather depend on which weight class it ends up being. ^^;

    The off the shelf gearbox on Ampflows is 8.3:1 I think, which is relatively high and possibly where that comment comes from if it was paired up with something like a E30-150, which is the "smallest" motor Ampflow make as of writing I think. With the right gearing, that can be used I feel though I must confess, I can't think of any examples right at this moment.
    Team Kaizen - Build Diary for all the robots

    AW: Amai, Ikari, Lafiel, Osu, Ramu
    BW: Shu!, The Honey Badger
    FW: Azriel
    MW: Jibril, Kaizen

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