Posts Tagged Mechanics

Last Minute Progress

The Chesapeake regional is coming up in about 12 hours, so here’s a quick summary of the team’s progress:

  • We built and programmed two scoring devices in one-third the time it took us to build one (and we rebuilt most of the robot, too)
  • The scouting network was finished. (Once again, the developer disagrees, and claims that it’s nowhere near. But since the binary is ready for publication, I consider it “finished.”)
  • I made some progress on the website, despite being instructed not to use sshd on the server because the system load was too high

The third bullet kind of annoys me.

In two weeks, we managed to build both a dumper and a shooter (an improved version of our old catapult). The stats are uninteresting, the point is that both performed well, unlike the old system, which didn’t work. I mean, didn’t “live up to our expectations.” It couldn’t predict motions, it broke a lot, and it wasn’t accurate. But both of the new systems worked. The dumper dumped (no, it couldn’t predict the motions of moving targets), and the shooter/catapult was accurate. We can predict motions, throw the ball, and the ball actually goes into the shooter (instead of from the harvester onto the floor) every time, thanks to an “unbreakable, but don’t try to break it” extension of the shooter’s orbit ball holder.

The team voted on which system was best, and the shooter won out. This lends itself to the strategy of focusing on collecting empty cells and passing them to the payload specialist. Our payload specialist is abnormally decent (hence the fact that we placed 23 out of ~60 at D.C. with a robot that could barely score), so if the robot can manage to get him some orbit balls, that should help.

The developer of our scouting software, “Scout 449″, has released version 4 of the software, which he says is ready for release. The source code (according to him) should be available soon. The funny part: he’s not willing to give me the source code at any point in the visible future, but he’s going to have it ready for the website, where anyone can download it, “soon.” He doesn’t see any incongruity.

The website will be redesigned (general interface and content) after Chesapeake.

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Week Five: 1/31/09 – 2/6/09

We took advantage of the first full week of school in nearly a month to get a lot done on the robot. The three-wheeled backerman drive was completed and prepared for transfer onto the robot itself. The dumper and harvester were altered to better manipulate moon rocks within the robot and the catapult was completed and tested in conjunction with the camera. Thanks to this, we now have a much better idea of the catapult’s range and ability. The final parts for the gyro were acquired and construction began on it. Our programmers continued to work diligently on the LabVIEW code and made changes to the website. Meanwhile, the public relations subteam worked on the team’s entries for various awards and provided the programmers with additional content for the website.

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Week Three: 1/17/09-1/21/09

Monday and Tuesday were holidays, but the team met anyway at the home of our Vice President. Attendance was significantly reduced because of this, but also because Wednesday, Thursday and Friday were exam days and many students opted to stay at home studying instead of attending meetings. We still managed to make progress, especially on exam days as the tests let out earlier than the normal school day and meetings often lasted longer.

Construction on the frame of the completed four-wheel drive continued, and the harvester and its accompanying roller and belt-clamping mechanisms were worked on. The ackerman drive prototype was switched for a more efficient three-wheel design that has been dubbed the ‘backerman’ design. Other mechanisms such as the harvester’s feed system and the catapult progressed, both of which are nearing completion. Meanwhile, the programming subteam was able to write code to better control acceleration make the camera track and follow colors. They also updated our team’s website.

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Week Two: 1/11/09-1/16/09

Subteams busied themselves with working on their projects and ordered crucial parts necessary to complete the robot. The prototype for six-wheel drive was switched for four-wheel drive, tested, and proved its worth. The ackerman design evolved into a three-wheel design incorporating a motorized castor wheel. The harvester, roller and catapult continue to progress, and while the shooter was considered a viable option for some time, it was eventually abandoned. Also, a full-size model of the trailer for the game was completed and our designs for power-bumpers were tested.

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Week One: 1/4/09-1/9/09

Following kickoff, we spent Saturday and Sunday brainstorming concepts for robot construction.  By the end of Sunday, we settled on designs to flesh out and prototype. On Monday, members gathered together and those who had been unable to attend the kickoff were informed of this year’s game rules and our team’s strategy. Throughout the rest of the week, the mechanics sub-team worked on completing the two prototype frames and several types of ball manipulator, including a harvester, a spring-loaded launcher, and a catapult. One of the prototype frames was completed enough to test, and it worked fine. The other one was still under construction.

Meanwhile, the electronics sub-team created several versions of the electronics board to test out with the prototypes and helped the mechanics sub-team with their various devices. In the programming room, the PR sub-team assigned various responsibilities and planned out their activities for the coming season. The programming sub-team itself were able to successfully track colors using the camera and began developing code for the prototypes’ drive systems. So far, attendance and moral have been high as we eagerly look forward to another excellent season.

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Saturday, February 17, 2007

Today we added a limit switch for the mast and fixed it so that the encoder would count down when the mast slipped down.  We hung a couple of tubes but discovered that our favorite manipulator (the one that grabbed the tubes the nicest) was too heavy and put too much torque on the mast, so we will either have to use another manipulator or modify our design.  We finally finished lightening the ramp and should be able to attach it tomorrow without too much trouble.

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Snow Day III (Friday February 16, 2007)

Today we discovered that the preset heights for the mast don’t quite work (the encoder sometimes slips, throwing it off about 1 revolution), but that should work by the end of tomorrow. We also discovered that the vacuum attachment for the mast drops the tube way too easily if the tube is slightly dirty (good thing we have other manipulator options!). Other than that, we spent quite a bit of time working on tidying up too many loose ends to count.

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Snow Day II (Thursday, February 15, 2007)

Today we had another snow day, so we could be found yet again at Katherine’s house building the robot. The programmers finally managed to get the mast to go to the preset heights (after managing to teach the encoder to count properly yesterday). The ramp is not yet done, but is coming along nicely and we hope will be finished tomorrow (or Saturday at the very latest…) As to our manipulator, we haven’t yet settled on a design but have 3 working prototypes we plan to try out tomorrow.

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Snow Day (Wednesday, February 14, 2007)

Today we could be found at Katherine’s house working in the basement as all of our stuff had been located Monday night (good thing too).  We made significant progress on fixing the code, making different possible manipulators to grab the tubes (we’re going to try them out once we get back to school, where we have a model rack), and fabricating the ramp.  It was quite a day!

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