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Thread: Chassis/Armour to weight ratio

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  1. #1

  2. #2

  3. #3
    On our ring spinner the weapon is 34kg (31%) and the chassis is 43kg (39%)

  4. #4
    In an ideal world your Armour and Chassis are one and the same. Carbide, Apollo, Aftershock, Ironside 3, Eruption... all of them have a design where some, and in some cases all, of their armour forms the chassis. They use sheet Hardox to form a monocoque and then attach all the components inside on their own mounts. This doubling up on jobs for the same part of the robot frees up weight to be used elsewhere, or it means you can use the same amount of weight but its much stronger.

    This method is also a reasonably cheap and easy way of building a machine as you can cut the Hardox with an angle grinder and then weld it yourself if you have too. Most teams lasercut the parts to save the effort, but they tend to be the ones welding it up.

    Of course this isn't always possible, depending on your design, but even those that don't follow this method entirely find a place for it, usually in armour pods or single piece folded chassis.
    Last edited by Eventorizon; 11th September 2017 at 20:20.

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  6. #6
    Team RCC tried HDPE (semi)monocoque 30mm thick on Obsidian. It lasted 1 event.
    The HDPE welds are more brittle than the sheets, and bends tend to concentrate stress.

    For bulkheads, HDPE is good enough, except for applications where stiffness is needed, like in drives and weaponsupports. For that aluminium, glassfiber filled nylon or simular materials are better.

    For "historical and personal" references.
    Tough as Nails, the first machine to use Hardox , still is using the original monocoque jaws.
    Dented and battered. Sliced here and there in the last wars by 15 year younger spinners, still carrying the mark of the Beta Prototype, and not being smashed flat at the Peterborough Event end 2001 as everybody believed at that time .

    Bullfrog in the last version of Team RCC , events all over the UK, Mainland Europe and even Russia, the much changed flipperarm and pivot still were integrated in the hardox monocoque. Not the other way around.

  7. #7
    Big Dave 3's weight allocations are as follows:

    Chassis: 35KG
    Weapon (all rotating mass & bearings): 40KG
    Armour: 25KG
    Electronics etc: 10KG

    Although, with that being said, not quire sure how to differentiate between chassis and armour.

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  9. #9
    If you've not seen it, Ellis's excellent build diary on his latest featherweight, Neon, is well worth a read: https://www.facebook.com/teamrangleb...35472470090422

  10. #10

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