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#31
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Re: Enough buying talk. Let's hear about ghettofab!
i have to say First ghetto fab is definetly more creative then other ghetto fab just because of the fact that we can't use duct tape. But I have seen cars with engines held in there with just duct tape and zip ties.
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#32
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Re: Enough buying talk. Let's hear about ghettofab!
Oh dear... This thread has most definitly been hiding from me.
2002. My rookie year. We attempted a 4 wheel chain driven trannie. What's interesting is that we didn't bother using any pillow blocks to hold down our shafts. Instead we hand fabricated (hacksaw and drill baby) little 1" x 4" strips of metal that were bent over the ends of the wheel shafts and bolted directly onto the chasis. This provided for slack in our chain and really bad alignment. To make up for the slack we placed a thick piece of rounded off, I think it was some kind of polycarbonate plastic, directly against the chain as a tensioner. Something like this would be able to be driven around rather gently on tile or contrete. But of course this was a robotics competition. Instead of tile, there was carpet and instead of gentle driving... well yeah 2 minutes and what are you going to do with a robot? So the chain would just pop right off it's sprocket and we'd be sitting ducks. I'm still wondering why we bothered to build it that way (hmm maybe it was a weight issue), but what did I know? I was a rookie at the time. Unfortunately, this is the sole reason why 692 likes to avoid chain drives. Minor gehettofabulousness: 2003. Robot's team numbers were shaped out of electrical tape and attached on with (colored!) zip ties. |
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#33
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Re: Enough buying talk. Let's hear about ghettofab!
Quote:
We also had a problem with a shaft in our drivetrain gear reduction start binding on us in Atlanta. We had two gears on the shaft that were welded together with a spacer in between them, and we had them cotterpinned to the shaft so that the assembly would ride in bearings. After trying for a couple of hours to readjust the shaft to eliminate the bind, with no success, I had the idea to just remove the cotterpin and let the gears spin on the shaft. This worked very well, despite the fact that we now had steel spinning on steel, but it only had to last for 2 more days so why not go for it? We also got an added bonus by taking out the cotterpins in that our sprockets were now self aligning! As for weight reduction, at Great Lakes last year our robot was about 3 pounds overweight. As a last chance attempt, myself and another team member got out our pocketknives and proceeded to trim the treads off the sides of our tires. It didn't get us 3 pounds, but when you have less than 1 hour left to be inspected for the regional, you'll do just about anything. ![]() |
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#34
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Re: Enough buying talk. Let's hear about ghettofab!
well, our '02 and '03 bots were entirely ghetto. But last year we had about 3 days to ship, and we had no idea how to attach the flapper (think of a vaccume agitator)(SP and wrong term, but work with me). It was just some rubber strips screwed to a pvc tube. We were using the window motor to power it, we just got PC11, a high strength epoxy and glued to stupid thing on. It worked well for the 2 times we used it.
This year... ELECTRICAL TAPE!!! |
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#35
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Re: Enough buying talk. Let's hear about ghettofab!
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#36
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Re: Enough buying talk. Let's hear about ghettofab!
Do you wanna see ghetto fabulous? Our robot was made out of wood, wires were hanging out from every direction and the drive train would always give out. It was so great. The name of our robot was "Robizzle", and the name of our bumpers were "Ghetto Foam". This was our rookie year and I am still proud of our rookie bot!
GO 1403!!! |
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#37
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Re: Enough buying talk. Let's hear about ghettofab!
Our 2003 rookie year still takes em all.....
http://www.rockwoodroboticsteam1098....t%2003%201.jpg Plexiglass base, and practically everything else wood, with chicken wire protecting our "guts". We also quickly noticed a problem with our drivetrain and controls, since it was chaindrive, and we had a rather simple control system that consited of really only "on or off", so when we would go forward or reverse, the bot would jerk around a lot and almost tip over on several occasions. Our solution? We took a 1/2" piece of sheet metal, bent it into a loop shape, and bolted it onto the bottom of our bot. The result? Never tipped over except once when it ran up and onto another robot, it would constantly be bucking around and made for quite a celebratory dance I distinctly remeber several teams asking us if we had gyroscopes on our bot..... Our 2004 bot was rather "ghetto" as well.... I think the pic is self-explanitory... http://www.rockwoodroboticsteam1098....s/Team1098.JPG However, despite our incredible ghettoness on our 2003 rookie bot, we got 1st in qualifying and if I remeber correctly, got to the semi-finals of the St. Louis regional..... But I attributed that to luck ![]() |
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#38
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Re: Enough buying talk. Let's hear about ghettofab!
For the 2004 competition, we (1403) created ghetto foam at nationals. Back in the nj regional, we were hit from the side, causing our gearbox to smash. In order to prevent anything like that from happening again, we took foam, cut it into circles, and velcroed it to the wheels. Someone also drew some nice rims with a sharpie.
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#39
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Re: Enough buying talk. Let's hear about ghettofab!
Team 1640:
Electrical tape and paint team numbers (http://www.team1640.com/gallery/disp...album=5&pos=33) Bumpers made of pipe insulation (http://www.team1640.com/gallery/disp...album=5&pos=35) And last but not least, the WaitGhetto function - it counted to a rediculously high number to act as a timer because we couldn't figure out how to do a proper timer! |
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#40
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Re: Enough buying talk. Let's hear about ghettofab!
1097: Rookie Year
We wanted treads, we knew we wanted treads, but Burko Belts definatly would break the budget, so we went around town till we found an old snowblower, and our robot was pretty much the bottom half of an old sowblower. Plus, our motors kept burining out (we were direct driving the treads, nor trannies), and that year in Sac they were doing the funky timing (15 min between matches, and then an hour between matches), and we had to replace a motor in like 10 minutes, so horay for the joys of zipties (and yes, you can run a match on Zipties). Last season: Our accelerometor based navigation was not working, and R. Kevin Watson kindly donated a set of Greyhill encoders. The problem, our 200 hour drivetrain had no space to mount an accelerometer. The solution, a piece of flashing bent up to hold the encoder, attached to a piece of surical tubing which we affixed to one of the pins holding our transmission together. |
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#41
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Re: Enough buying talk. Let's hear about ghettofab!
2002 was our second year and we thought we learned so much from our rookie season. Our robot was almost entirely 1.25 square aluminum tubing. It weighed so much that we had to save weight any way we could. Instead of organizing the electronics neatly on some type of board, we just zip-tied everything somewhere on the frame. Wires and tubing went everywhere. When something went wrong it took forever to trace the wires and fix it. We placed last at the inaugural St Louis regional, but since we had a spot at EPCOT, we spent the elimination rounds designing some changes and hacksawed off the front half of the robot. The plan was to replace it with 1.25' PVC pipe that we brought to EPCOT. We spent the first day at EPCOT attaching the PVC with self tapping sheet metal screws. In the end our robot was half square aluminum tubing and half PVC. Our team numbers were printed on white label paper, except someone had the bright idea to print only one number per sheet.
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#42
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Re: Enough buying talk. Let's hear about ghettofab!
Just a few weeks ago for the homecoming parade, we discovered that our OI's portable power source had been made and soldered with the wrong type of plug. So what did we do in our plight far far away from the robotics room? grab the wall adapter we were carrying, cut off the plug, strip the wire with our teeth (we had no tools), twist the wires together, and finish it off with using a little bit of electrical tape stolen form another part of the OI.
Another example of the ghettobot in action would have to be our team (114)'s HALF competition. It's an off season in team competition, where we basically make driving hunks of crackpot engineering. All that the really are is driving plywood boards with some sort of manipulator on top. Here's a few examples from last year. http://engineer.la.mvla.net/robotics/images.php?view=323030352f48414c464d656469612f3034 48414c462d347468506c616365426f742e676966 http://engineer.la.mvla.net/robotics/images.php?view=323030352f48414c464d656469612f3034 48414c462d337264506c616365426f742e676966 http://engineer.la.mvla.net/robotics/images.php?view=323030352f48414c464d656469612f3034 48414c462d326e64506c616365426f742e676966 Watch the ghettobots spin! Last edited by CraigHickman : 07-12-2005 at 01:10. |
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#43
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Re: Enough buying talk. Let's hear about ghettofab!
Quote:
Last edited by Venkatesh : 07-12-2005 at 22:24. Reason: bbCode mistake |
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#44
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Re: Enough buying talk. Let's hear about ghettofab!
In 2005, team 1318 had a problem while using the autoloaders. The refs were enforcing the rule that you actually had to be touching the triangle on the ground to grab a tetra, and although our chassis was easily over it, our wheels sometimes weren't far enough forward to be on the triangle when we grabbed the tetra. Luckily we weren't penalized for this the match it happened, but the refs warned us we had better fix the problem. Our solution was to hang zipties off the front of our chassis, so they would brush against the ground. Oh well, it worked.
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