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Thread: Big Dave 3 Design & Build

  1. #11
    Ah, I'm having almost nothing but problems with Hobbyking it seems! Finding out the mounting pattern for the weapon motors is a lost cause - I'm ordering the motors before the mid plates just to make sure I've guesstimated right!

  2. #12
    Quote Originally Posted by emisnug View Post
    Are you on a Mac? I've tried it on PC/Android/iOS and it displays, although it doesn't work on my work Mac.
    Tried on all of the above, gives a no-entry sign as its some protected google doc/image

  3. #13
    How strange! Try an Imgur link: http://imgur.com/StqVqh3

  4. #14
    For those wanting to keep up-to-date with this build, you can find all the latest on our blog at https://www.arc-robotics.org.uk/category/big-dave-3/

    We'll try and remember to post here as and when updates arrive.

  5. #15
    Ali - our driver - has just posted a (fairly lengthy) commentary on what driving our rolling chassis is like.

    https://www.arc-robotics.org.uk/2016...ve-big-dave-3/

    Over the next few weeks (until we get back into the workshop in early January), we'll be explaining some of the logic behind what we're building, and how we're keeping everything on track to be ready in time for the next series.

    Given how little time we can actually spend in the workshop, we're quite keen to make sure that we maximise the use of that time. That means that while I'm preparing electronics in Southampton, Rob's getting parts made in Norwich, and Ali's working on actually giving the team that professional edge in Leeds. As long as Rob's done his numbers right..... it'll all just about fit.

  6. #16
    So, we've ignored advice from this fine community for at least a second time by trying out a HiFei speed controller rather than dropping £500 on an MGM.

    So far, so good - I appreciate we haven't put much load on it yet (~15A) compared to what will be a considerably higher current when we have the weapons motor hooked up to the drum. You can view my testing at my flat in Southampton on our blog: https://www.arc-robotics.org.uk/2016...weapons-motor/

    Next workshop weekend for us is 7th/8th January, so we'll see how far we can get. There's been a slight hiccup in the drum department - but I think Rob (emisnug) is on that to get it sorted asap. All being well, we'll be spinning everything up soon....

  7. #17
    Thanks to all you wonderful people on here with advice over the last few weeks, Rob's just been frantically redesigning the front end of Big Dave 3.

    Here's what he had to say on the matter: https://www.arc-robotics.org.uk/2017...bout-bearings/

  8. #18
    How are you preloading the taper roller bearings in the design?

  9. #19
    SKF are just over 300 meters from my workshop, if you want any advice on applications i can have a word for you.

    They are very approachable in the factory.


    Quote Originally Posted by cmalton View Post
    Thanks to all you wonderful people on here with advice over the last few weeks, Rob's just been frantically redesigning the front end of Big Dave 3.

    Here's what he had to say on the matter: https://www.arc-robotics.org.uk/2017...bout-bearings/

  10. #20
    Bearing preload wise, I'm leaning towards a beville washer running an ever-so-slight preload. However, preloads are something I have never, ever done before, and if you've got any experience with them, I'm all ears. Currently, they seems pretty straightforward, which normally means I'm missing something huge.

    Katch, I may well take you up on that....

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