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Rango - Build diary

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  • Rango - Build diary

    Hi guys. Tormenta 2 got pretty knackered last year, and whilst we'll probably patch it up and get it running, it'd be nice to have an all new machine for the champs. I'm building and funding this one solo, so I've spent a few months brainstorming/designing/cheapening and in the past month or so, ordering parts.

    Rango is a 4WD machine with a small drum up front.

    Some details, feel free to skip!..

    -Construction: 15mm 7075 aluminium weapon bulkheads with 20mm HDPE sides, 1mm ti base (non structural), 5mm HDPE top. 12mm HDPE back panel, 3.2 or possibly 4mm hardox wedge on the front.
    -Weapon: ~2kg "drumette" doing around 9k rpm.
    -Drive: 2x Johnson 885 motors @ 18v (about 600w each) powering 75mm wheels, around 15mph top speed.
    -Speedos: TZ85s
    -Battery: one of the 5s 30C Optipower packs, probably 4300mah.
    -Radio: anything I can get cheaply
    -Things: stuff

    Quite a few parts have already arrived/I've started to make. Still need to get the battery, 3 speedos, weapon construction, hardox front end, etc.

    The main aspect of this machine is its drive. It's essentially a rambot with an electric flipper on the front.

    I had intended to make a simple machine as my first solo build, which I have completely failed to do. And I'm pretty late on starting so chances are this'll be riddled with reliability issues if it's even complete by April. I bought a hobby lathe a few months ago so if nothing else it should have some nice shiny bits. :P

    Will update with some pics of what I have so far at some point. For now, that's it, cheers.

    Ellis
    Last edited by Ellis; 6 February 2014, 13:04.

  • #2
    How far have you geared the drum down? It must be fairly slow if you are planning for it to be an electric flipper, or is it just designed to toss machines over like Conker 1?

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    • #3
      By electric flipper I just mean I'm not setting out to make a really damaging spinner. The weapon reduction is around 3.5:1, giving a real-world 9000rpm or so. Being single tooth that's like a two tooth disc doing 4500, coupled with the fast drive I'm hoping this translates into consistently good contact. Only time will tell!

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      • #4
        A few pics to get the ball rolling, more will be added to photobucket here.





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        • #5
          Nice

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          • #6
            Needs moar belt!
            And there's something about the way the drive motors are orientated that oozes cool. It's always the little things

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            • #7
              Looking serious awesome guys!

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              • #8
                Looks great, very similar to k2 from the US, what weapon motor is that? I thought it was a brushless but it only has 2 wires I can see

                Edit. Ignore that I just noticed that it does in fact have 3 I'm just blind
                Last edited by mrsam; 7 February 2014, 13:01.

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                • #9
                  It was a brushless inrunner from an older Drumroll, because Jamie is wonderful he donated it on to me when I was planning a drum and when that failed to happen I donated it along to Ellis so it could be used in a propper robot.

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                  • #10
                    Rango & C3.5.jpg

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                    • #11
                      Where did you get those gears and motors from? Seems extremely compact, that kind of setup for drive!

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                      • #12
                        Originally posted by Eventorizon View Post
                        [ATTACH=CONFIG]4329[/ATTACH]
                        Lol, but you aren't building that one are you! I admit Rango looks nothing in comparison but it'll probably cost a 3rd to build lol.

                        Originally posted by Flag Captured View Post
                        Where did you get those gears and motors from? Seems extremely compact, that kind of setup for drive!
                        The motors are now discontinued/out of stock it would seem. They were originally from here: http://www.pollin.de/shop/dt/Mjk0OTg...HC885G_AS.html

                        The right angle gears are for cheap 4" angle grinders. Got a set of 3 on ebay from China for 12 quid delivered :P. They're pretty rough in truth, both in finish and meshing, but I popped open the kind of grinder they go in a while ago and they were worn in and smooth running. The belts and pulleys are all from www.beltingonline.com.

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                        • #13
                          Its getting harder to source decent sized brushed motors. Noticed that these are still up for sale http://www.ebay.co.uk/itm/2009126068...84.m1423.l2649

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                          • #14
                            Bulkheads are now being machined, I'm soon going to order a Spektrum dx6i and a 5s Optipower LiPo. Once that's done I'm going to go across to the workshop and start making anything I can to make assembly once the bulkheads arrive that little bit faster. Ball is gradually getting rolling, sadly it's now less than two months until the champs!

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                            • #15


                              Mounting plate, standoffs and shaft support. The bearing will sit into the bulkhead this lot bolts to.

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