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Jackbk
Joined: 07 Aug 2013
Posts: 22
Location: New Zealand
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Dreamcrusher/The Undertaker - OYES Robotics - NZ
Hi everyone, with nationals upcoming we thought we would start a build report about our two robots – I’ll start with a quick recap about where we are at/problems we have had so far and we will be sure to update it going forwards.
We are a group of robotics enthusiast from across the ditch, and we are just getting into the combat side of things.
For both robots, we have decided to start out with Banebots 20:1 gear boxes with 550 motors (4x on each) for the drive. This has worked out pretty well so far.
The Undertaker
Originally we only planned to bring Dreamcrusher to this years nationals, but decided that since we were spending the money to come, we might as well bring another robot so we will get to have more than 2 fights in total if Dreamcrusher gets knocked out straight away in the (possibly) double elimination. The Undertaker will be driven by my brother (Steven).
We started The Undertaker 4 weekends ago, so we are pretty happy with how it turned out. It is simply an invertable wedge built with 25mm steel angle welded together. We didn’t really run into issues with the build, so below is the final robot (for this year).
Photo:
https://drive.google.com/file/d/0B55eyg4wmER3VWt3QlFqMjl5RTQ/view?usp=sharing
And here is a video of it (pre paintjob) smashing up an old laptop:
https://www.youtube.com/watch?v=ERx4EoUos8w
It has plenty of drive power, and can push people sitting on a wheelie chair around.
Dreamcrusher
Dream crusher is a vertical spinner, built (mostly) out of 10mm aluminium plate. The base is currently 10mm polycarbonate, but we are planning on changing this to the equivalent weight aluminium.
Photo:
https://drive.google.com/file/d/0Bx6ALwF4U4rXcUVYLTc5NEVjYVk/view?usp=sharing
The first weapon we machined up for it was out of mild steel. This unfortunately blunted on the tip quite badly when it took a big hit.
Photo:
https://drive.google.com/file/d/0Bx6ALwF4U4rXUW1xVzlLZVR0T3M/view?usp=sharing
We have now machined another weapon out of Bisalloy, hopefully this won’t become blunt as easily. We are going to keep the original mild steel bar and weld some mining teeth to it, which will hopefully take most of the hit.
The original weapon set up had a Redback Racing 91 brushless outrunner chained up to the weapon. This worked pretty well on small targets (see videos below). However when hitting a larger item, it bent the motor shaft quite badly (using chain and no shock mounting is funnily enough… a bad idea). We shock mounted the motor, and the sprocket to the weapon and tested it again after straightening the motor shaft. The original (shaft bending) hit destroyed the internal bearings however and once we spun it up again the bearing shrapnel got sent through the motor, destroying the windings a small motor fire followed.
Good thing we have cheap imported Chinese outrunners perfect for the job right? Nope. We do have spare imported Chinese outrunners, but as it turns out the shafts on these ones are 6mm instead of 8mm. With the recent disastrous experiments, we decided it probably wasn’t a good idea to run them even though everything is now shock mounted.
We ended up buying a Scorpion SIII-4035-380KV locally due to the time constraints we have. This seemed to work perfectly with the shock mounted set up, and seems to be able to dish out big hits without inflicting any damage on itself.
Dreamcrusher driving around:
https://www.youtube.com/watch?v=DWKsfXU2O-Q
Weapons test on small (~2.5kg) objects:
https://www.youtube.com/watch?v=qsSmYELQxEI
https://www.youtube.com/watch?v=Nz4VpXO6iuo
https://www.youtube.com/watch?v=uZ6chhMJ01g
Weapons test on 15kg hunk of steel:
https://www.youtube.com/watch?v=GZc4s0TzGf4
We have the front and back wedges and the top armor to attach still, hopefully they will be done by the end of the weekend.
We cant wait to meet you all in a couple of weeks and have a look at all the awesome bots!
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Sat Aug 06, 2016 8:19 pm |
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