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Thread: Attitude Adjuster (Beetleweight)

  1. #11
    I'll see - it could be that I just double up the armour around the battery. My thinking was that there are a lot of scary drum spinners that would love to chomp through the top if it was upside down!

  2. #12
    Ocracoke's Avatar
    Team Kaizen

    AW: Osu, Ikari, Ramu / BW: Shu! / FW: The Honey Badger / MW: Kaizen (Building)
    Somewhere on the Wirral
    I have flashes of Bourbon and Ion in my mind, yeah, they might make it in.
    Team Kaizen

    AW: Osu, Ikari, Ramu
    BW: Shu! (Build Thread)
    FW: The Honey Badger (Build Thread)
    MW: Kaizen (Build Thread)

  3. #13
    Made quite a bit of progress since the last update, so I have a lot to post here (evidenced by the fact I maxed out the images that I can attach ). Apologies that all the images are sideways :/.

    I have access to a laser cutter that can cut perspex, so I made a drilling template for the side bulkheads, based on my CAD. I drilled out the holes for the side bulkheads and then used a Forstner bit to drill out the holes for the drive motors, making a satisfying shaving as they did so.


    I then added the threaded inserts to the back of the side bulkheads and drilled holes in the rear bulkhead using a similar method. However, the holes didn't quite line up so I had to use a Dremel and needle file combo to make it fit. Then I could fit the drive motors to the side bulkheads and attach the rear to the sides!


    Then I was ready to attach the front to the sides. I decided to use the "really long wood screws" approach, so drilled out pilot holes and then attached them.


    ...And then I realised that the front was upside down. Oops. Anyway, I put the chassis on the right way up and attached the Fingertech foam wheels and had a rolling chassis to decorate the spare room.


    I decided to make use of the laser cutter to make a perspex prototype of the weapon bulkheads, again based on my CAD, so that I could see how the components all fit together. If only I could laser cut the HDPE and polycarb for the rest of the robot! I only had access to 3mm perspex so I had to make 3 layers per side. I jammed all the components inside the robot after putting together the perspex weapon bulkheads and realised that it's going to be a tight squeeze with the wiring...


    With the robot looking vaguely robot shaped, I was about to go on holiday for 3 weeks. However, before I left I decided to cut the polycarb baseplate using a mitre saw. This was a mistake, as the sheet of polycarb shattered, and bits went flying everywhere. Safety goggles are important, people. I learnt that I should've used a jigsaw to do this. Oops. This was the result.


    When I got back I focussed my attention on the baseplate. I again cut out a prototype in perspex, and duct taped it to the bottom of the robot. Again, if only I could do the rest of it in the laser cutter! I used that to cut out the real baseplate out of polycarb, using a jigsaw this time. I discovered I can't cut straight at all, but I've made it work for this. I decided to attach the baseplate using brackets similar to Fingertech's Nutstrip ( Sadly, this isn't available in metric, so I made my own. I had two bits of 6082T6 aluminium bar stock, which I drilled M4 holes at 12mm intervals. The first one seemed straight enough, but the second one went a bit wonky... I'll probably scrap that one and do it again.

    I finally made enough to be able to cut it into strips small enough for me to attach the baseplate. I went for 6 bolts, 3 at the front and 3 at the back. While the weather outside was "taps aff", I was doing some tapping of my own. I eventually tapped enough brackets to be able to attach the baseplate. I now need to update my CAD to take these into account.


    Today I worked on the wiring. I made a wiring loom for the main wire, which includes a removable link. I stole the method of attaching the ESCs to the main battery from somewhere, but unfortunately I can't remember where. It involves crimping ring connectors and attaching them together using an M3 bolt and nut. I then put everything together and once again had something that I can scare the cat with.


    As I saw earlier, there isn't a lot of room to play with in there when you add in the wires, so I'm a little worried about that. One possible option if space is tight is to swap out the Sabertooth for Vex 29s or Botbitz 10a ESCs. A lot of builders seem to be wary of the Sabertooth, and it's a little bit big and heavy. For now though, I'm glad to have something robot shaped. Tomorrow is the last chance I'll have to do something uninterrupted, before I have to go back to work. I'm planning to tidy up the wiring and possibly try and do the weapon bulkheads. I need to finalise the design for that piece, or I might just start building and see what I end up with...
    Last edited by scott; 27th June 2018 at 22:54.

  4. #14
    One other thing, I have a piece of 1.2mm Grade 5 titanium for a wedge, how am I best to cut and drill this? I was thinking about using the abrasion cutting wheel of my Dremel, and using a 4mm cobalt drill bit, is that along the right lines?

  5. #15
    Drilling with a Cobalt Tool is a good idea, just use low cutting speed and cool the drill.
    You can also use a normal sawblade for metal and cut it with a hacksaw.

  6. #16

    Wanna Choppa (Axe FW) Short Circuit (HW RWs6) Locking Wheel Nuts (AW) DELLapidated bANTtery (AW) Lo
    Eastleigh, Hampshire
    if using conbolt drills, go slow and use lots of coolant. i was able to drill through 3.2mm Hardox with some cobolt drill bits from Toolstation - about £3-5 each 5mm-7 about

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