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Thread: Attitude Adjuster (Beetleweight)

  1. #31
    Good idea, and yeah, I was planning to use duct tape and cardboard for the sharp edge protection! What dremel bit do you use for sharpening the arm on Shu!?

  2. #32
    Ocracoke's Avatar
    Team Kaizen

    Status
    Offline
    Name
    Michael
    Robots
    AW: Osu, Ikari, Ramu / BW: Shu!, Mita / FW: The Honey Badger / MW: Kaizen, ???
    Location
    Somewhere on the Wirral
    Posts
    780
    For the small things, I tend to use the aluminium oxide grinding rotary bit (the pink stone), which is just coarse enough for steel (which I've used on The Honey Badger). For Titanium, I'd possibly experiment with the same bit, using a coarser bit of it is required. I've not worked with Titanium but I understand the sparks can be hazardous to health so the usual precaution of a face mask and eye protection.
    Team Kaizen

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

  3. #33
    My previous update was a few days before the Euros. In that time I had to put both wheels on, finish the weapon, and generally prepare for the competition. I had never driven it, so I tried it as soon as the wheels were on. Unfortunately I found the wheels had virtually no grip, and the pinion in the brushless motor almost immediately came loose. I epoxied the pinion back on and crossed my fingers. A couple of late nights to make some last minute changes, and an afternoon of cutting bits of polycarbonate to make spares, and I was ready to make the drive to Marlow.

    IMG_1072.jpgIMG_1101.jpgIMG_1089.jpg

    The drive took 7 hours, but I was as ready for the competition as I would ever be. I was nervous, but my main goal was to not embarrass myself.

    IMG_1110.jpg

    And then we were at the competition! I got there early and set up in the room next to a computer. I passed safety without trouble. I'd drilled a hole in the weapon bulkhead for a locking bar, I'd made sharp edge protection out of cardboard and duct tape, and I'd verified the failsafe behaviour. I then went and had a look around everyone's robots. I was really wowed by how friendly, welcoming and helpful everyone was. It was especially great seeing Michael (Ocracoke), and thanking him in person for all the help and advice on this forum.

    IMG_1123.jpg

    The draw came out and as a coincidence my first ever battle was against Michael with Shu!. I powered up for the first time, shaking with nerves. I tried the weapon and it worked, but then disaster struck and the axe wouldn't retract. Michael offered to let me fix it, but I knew it would require taking the weapon apart to fix so I accepted it. I'm happy to say that I won, even without the weapon. The robot was very fast and powerful but uncontrollable and the wedge was too low so it kept catching on the uneven floor. After a near-miss, almost driving into the pit, it appeared that I had damaged Shu!'s wheel and Michael tapped out. So I'd won my first battle! But I had work to do to get battle-ready for the next fight.

    After I got back to the pits I discovered that the axe wasn't working because I hadn't threadlocked the Fingertech pulley and so it was loose. After taking it apart to threadlock it, I then turned my attention to the drive. The pinion gear had come loose again, so the motor was turning but the wheel wasn't. I replaced the motor with my spare, and put everything back together. On the radio I had set the limit to about 70% on the drive already, but Michael gave me some further tips on setting up expo on my DX6i.

    I discovered second round battle was against Inertia 2 and Drizzle, made by the team that made Tauron and Monsoon. Being a keen Battlebots fan, I was both nervous and excited to go against such a scary looking machine. What resulted was a great fight, that could've gone better for me but was a great experience.



    IMG_1134.jpg

    Overall, I was really please with how the robot performed in the fight. I got a few "GOOD HITS" with the axe, including stopping the spinner of I2, and the robot was more controllable with the exponential rate set up on the radio so I got a few good attacks. The battle ended for me when Drizzle hit the side and shattered my polycarb top panel, leaving the receiver hanging out. I tapped out after that, because I didn't want to risk any more expensive damage.

    When I got it back to the pits I assessed the damage. The drive pinion came loose again in the motor that I repaired the day before, so I lost drive in one side again. looks like Drizzle hit the wrong place on the side and cracked the polycarb, which caused it to go through the bolt. The 3d printed bracket also broke, and the panel shattered at the back, again at the bolt hole. I think a washer would have helped on the bolts. I was pleased by how the 5mm HDPE wheel guard tanked the hits, and how the 10mm bulkhead also held up, though Drizzle also got one of the wood screws that attach the sides to the front and bent the head of the screw.

    That was it for the day for me. I considered using the backup brushed motors I had brought with me and fighting in some whiteboard battles, I didn't in the end. I also didn't fancy the rumble at the end, since I want to iterate on Attitude Adjuster for next year. I have some ideas around replacing the motor shafts with shafts from the brushed donor motors to fix the loose pinions, increasing the power of the hammer by using a bigger motor, and finally by making the footprint of the robot smaller, as there was a lot of wasted space when I moved to brushless.

    I've taken a break from the robot over the last few weeks to focus on other things, so it is still in bits after the Euros. I'm going to give a small talk at work because everyone has been asking about it, and I've been showing everyone the video. I plan to put it back together with the more reliable but heavy brushed 1000rpm motors for demo purposes to give people at work a shot of driving.

    It was a great experience, I met a lot of great people and I achieved my aim of not embarrassing myself. Will see everyone next year! Hopefully I might even make it to another competition before the Euros.
    Last edited by scott; 10th November 2018 at 23:51.

  4. #34
    Ocracoke's Avatar
    Team Kaizen

    Status
    Offline
    Name
    Michael
    Robots
    AW: Osu, Ikari, Ramu / BW: Shu!, Mita / FW: The Honey Badger / MW: Kaizen, ???
    Location
    Somewhere on the Wirral
    Posts
    780
    Great to see you as well, glad I was able to help out with your robot during the Euro championship! Hopefully we'll have another match soon with a rebuilt Shu!.
    Team Kaizen

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

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