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Thread: FW- Crash Course

  1. #1

  2. #2
    Welcome, these insert nuts works well with HDPE.
    Also depending on where you live, Robodojo will be a good place to test it when yours is ready.

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  4. #4
    hi and welcome, i got 2 questions and 2 suggestions and some advice ,

    1 what type of robot are you planning to make? 2 What tools do you have access to?

    i would highly suggest reading as many build logs as you can, go to build logs and sort by responses and get reading. also i would use barrel nuts over threaded inserts as they can be rip much easier then barrel nuts, especially if you want to fight spinners. for example

    also dont give up, everyone started somewhere just don't try and build outside your capability to begin with having a working at your first event is a massive achievement get to that first.

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  6. #6
    Ocracoke's Avatar
    Team Kaizen

    Hey there, welcome to the forum!

    I do have some questions about the HDPE as whats the est way to attach the panels together as i fear screws wont be enough, and that continuously taking the screws in and out of the top panel will mess with the structure and it will fall apart.
    In addition to the aforementioned threaded inserts and barrel nuts, L shaped brackets I find also work on the internal structure of the robot if only to offer more rigidity. I used to do what you mention with mine and screw directly into the HDPE (and a underlying wood frame) with self tapping screws. I can say, with absolute certainty, that won't hold up in the EXR arena as the below video shows.

    (8:33 in the video)

    Team Kaizen - Build Diary for all the robots

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

  7. #7

  8. #8
    Ocracoke's Avatar
    Team Kaizen

    Personally, I use threaded inserts for the lid of my FW these days but you could use barrel nuts I am sure.
    Team Kaizen - Build Diary for all the robots

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

  9. #9
    threaded inserts work fine for lids just nothing that will be taking spinner hits, so main frame, Armour panels etc another method is using threaded aluminum blocks (like pulsar/magnetar), it is a very strong, modular system which allows for quick panel replacements if designed right however it is heavy. like i said before, build to what tools you have.

    anyway what design are you thinking about

  10. #10
    Shooty's Avatar

    Hi there! You sound like you're in a very similar position to the one I was in back in 2017. When I started out, I only really had a drill and some basic saws, and wanted to make a linear actuator powered lifter made mostly of HDPE, so I'd highly recommend looking through some of my build logs to see some of the issues I faced as well as how I addressed them.

    For general construction of HDPE I will use barrel nuts 99% of the time. They're tricky to get right, but are by far the strongest way of securing parts together when it comes to plastic. Threaded inserts can work as well, and can be easier to do, but the strength between different kinds of inserts differs greatly, and they can fail and pull out on the bigger hits, so keep that in mind. Screws are the lightest option, and can be quite strong, but the more you use them the weaker they'll get. The few places I use them in my machines are in areas where I won't be taking them apart in all but exceptional situations.

    The Hayes manual is an excellent resource, and you should be able to use many of the parts from it in future builds, so it sounds like a good idea to do that. Feel free to ask if you have any more questions!

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