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pilleya
Joined: 31 Mar 2016
Posts: 91
Location: Sydney
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Post Vivid Report on Sportsman Tumbler
Going into the event I didn't have big expectations for Tumbler the actual structure of which is made from 6mm MDF. I felt that the biggest risk to Tumbler would be taking a big hit(s) from one of the Pneumatic Flippers and having the frame crack on landing ( although I had plenty of spares). We ended up getting a good draw with first match up against Nibbler.
In the match against Nibbler, Tumbler was able to out manoeuvre Nibbler due to the fast/powerful drives( 670 watts per side)and low weight 10kg with battery however we ended up getting the lifter stuck in the gap between the arena kick plate and the MDF floor which caused loss of mobility( even though robot fully operational).
Second match up was against the walker Banana Bender, this seemed like a difficult matchup for Tumbler being only 10kg compared to the 20ish kg of Banana. We again used our speed to cause some big hits on Banana, however it was tricky because we would line up to do a rear/side hit and generally Banana was able to turn to have its scary lifter facing us by the time we approached. Banana bender picked up Tumbler twice overturning it, luckily it was invertible however the driving suffered while getting to grips with driving inverted( no driver practice in either orientation had occurred). Banana bender flipped us over again to which a "thankyou" was exchanged as we could now drive properly. We found that Banana Benders biggest weakness was that with the arm lifted up, it could be very easily pushed across the arena from the front.
It was a very enjoyable fight, and our first win.
Our last match was supposed to be against Chain Reaction, but was replaced with Glitch after it suffered in-repairable damage. We decided to drive inverted with the 3mm Polycarb on the bottom ( we had planned to drive 6061 on the top normally but the aluminium side had more ground clearance so we inverted it) we also added an extra 3mm 6061 plate over our electronics that we had previously taken off to increase ground clearance. Unfortunately Glitch’s Saw Outrunner had been smashed in a previous fight meaning that it didn’t really work properly (we wanted to see how our armour held up.
Being the two fastest robots around the box it was a very fast paced battle with many high speed collisions, one of which caused a section of our Plywood frame to crack and break off but it did not cause any problems. Our Aluminium box section lifter forks also suffered considerable damage against Glitch’s Wear Plate armour.
Overall a very enjoyable event, the Wooden frame held up very well, only breaking when a.) I drove at the arena wall at full speed to see if what happened during practice and b.) When I tried to lift up Deathroll during another practice time.
I was very happy with how the Drive system performed; the Talon SR controllers had no problem with the 190ish amps stall current on the drive motors in Tumbler. 4:1 with 4” wheels with those motors was a good combination of speed and acceleration (the fastest robot at the combination by a significant margin). I will certainly be using the same drive system until I want to commit the time and money to a brushless setup.
Now I just need to decide/design what I am going to bring to the national tournament in August.
Big thanks to Steve for running the event and helping/teaching me to program my T6A.
Also thanks to Don, Andrew and Richard for lending me tools( I could only bring as much as I could carry on the train). Also Glen for your awesome CNC plasma recommendations( hoping to build a Plasma to make parts for my next robot)
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Mon Jun 12, 2017 3:49 pm |
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