Go to Post Making a part look pretty even after it is functionaly done can be a very good thing, espically when the part gets cut from the bot and you get to keep it as a trophey. Take pride in your work. - Andy A. [more]
Home
Go Back   Chief Delphi > FIRST > General Forum
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #31   Spotlight this post!  
Unread 03-02-2005, 14:19
Conor Ryan Conor Ryan is offline
I'm parking robot yacht club.
FRC #4571 (Robot Yacht Club)
Team Role: Mentor
 
Join Date: Nov 2004
Rookie Year: 2004
Location: Midtown, NYC
Posts: 1,896
Conor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond reputeConor Ryan has a reputation beyond repute
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.
Reply With Quote
  #32   Spotlight this post!  
Unread 03-02-2005, 15:32
hacksaw692 hacksaw692 is offline
Registered User
AKA: Sherry Batin
FRC #0692 (The Fembots)
Team Role: Coach
 
Join Date: Apr 2002
Rookie Year: 2002
Location: Sacramento, CA
Posts: 133
hacksaw692 is an unknown quantity at this point
Send a message via AIM to hacksaw692
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.
__________________
2002 - Team 692, Robot Driver/Historian
2003 - Team 692, President/Pit Leader/Lead Mechanic/Robot Driver
2004 - Sitting on the Sidelines...
2005 - Sac Robot Inspector
.
[as much as you may not believe it, Real Life can get in the way of FIRST]
.
2009 - Team 692, Alumni Mentor/Drive Team Coach

Cal Poly, BS Mechanical Engineering, 2008
Reply With Quote
  #33   Spotlight this post!  
Unread 03-02-2005, 16:18
Evan Austin Evan Austin is offline
out of my mind, be back later
no team
Team Role: Alumni
 
Join Date: May 2004
Rookie Year: 2003
Location: Vincennes, Indiana
Posts: 30
Evan Austin is an unknown quantity at this point
Re: Enough buying talk. Let's hear about ghettofab!

Quote:
Originally Posted by suneel112
Then somebody suggested using a popped 2x ball to do the trick. We got a popped 2x ball (I don't remember whether it was form our kit or from our good friends on 447) , cut it into strips, and stretched it around the arms.
If it was at Atlanta it could have been from us. I remember the ball, but I don't know what happened to the rest of it. We wrapped part of the ball around the grabbers on our robot to try and make them hold the ball better. It helped, but it didn't cure it completely.

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.
Reply With Quote
  #34   Spotlight this post!  
Unread 03-02-2005, 16:38
M. Hicken's Avatar
M. Hicken M. Hicken is offline
Where am I?
AKA: I AM PACO
#0219 (Team Impact)
Team Role: Driver
 
Join Date: Jan 2004
Rookie Year: 2002
Location: Washington, NJ
Posts: 158
M. Hicken is a jewel in the roughM. Hicken is a jewel in the roughM. Hicken is a jewel in the rough
Send a message via AIM to M. Hicken
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!!!
__________________
If duct tape isnt the answer you're looking for, you're asking the wrong question

There is no such thing as a stupid question, there are just a lot of inquisitive idiots
Personal rookie year: 2002
Team Impact 219: 1998
Reply With Quote
  #35   Spotlight this post!  
Unread 03-02-2005, 20:46
Sachiel7's Avatar
Sachiel7 Sachiel7 is offline
<Yes I managed to flip it
AKA: Shayne Helms
FRC #1132 (RAPTAR Robotics)
 
Join Date: Sep 2002
Rookie Year: 2002
Location: Richmond, VA
Posts: 541
Sachiel7 is just really niceSachiel7 is just really niceSachiel7 is just really niceSachiel7 is just really niceSachiel7 is just really nice
Send a message via AIM to Sachiel7
Re: Enough buying talk. Let's hear about ghettofab!

http://www.chiefdelphi.com/forums/pi...&quiet=Verbose

'nuf said.
__________________
-=Sachiel7=-

There's no such thing as being too simple!
Look for Team #1132, RAPTAR Robotics at the VCU Regional this year!
Reply With Quote
  #36   Spotlight this post!  
Unread 03-02-2005, 21:51
slickguy2007 slickguy2007 is offline
Copioli is the man!!!
FRC #1403 (Cougar Robotics)
Team Role: Alumni
 
Join Date: Nov 2004
Rookie Year: 1997
Location: Skillman, NJ
Posts: 545
slickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond reputeslickguy2007 has a reputation beyond repute
Send a message via AIM to slickguy2007
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!!!
Attached Thumbnails
Click image for larger version

Name:	DSC04141.JPG
Views:	91
Size:	60.7 KB
ID:	2888  Click image for larger version

Name:	DSC04144.JPG
Views:	82
Size:	61.8 KB
ID:	2889  
Reply With Quote
  #37   Spotlight this post!  
Unread 03-02-2005, 23:31
MConte05's Avatar
MConte05 MConte05 is offline
"Operation FIRST"
AKA: Matt Conte
#1098 (G.I.'s)
Team Role: Driver
 
Join Date: Jan 2004
Rookie Year: 2003
Location: St. Louis
Posts: 79
MConte05 is on a distinguished road
Send a message via AIM to MConte05
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
Reply With Quote
  #38   Spotlight this post!  
Unread 06-12-2005, 14:57
PhantomWorks's Avatar
PhantomWorks PhantomWorks is offline
Registered User
#1403 (CougarRobotics)
 
Join Date: Jan 2005
Rookie Year: 2003
Location: New Jersey
Posts: 4
PhantomWorks is an unknown quantity at this point
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.
Reply With Quote
  #39   Spotlight this post!  
Unread 06-12-2005, 15:26
coastertux coastertux is offline
Penn State Class of 2010!
AKA: Steve
FRC #1640 (sab-BOT-age)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2005
Location: Downingtown, PA
Posts: 264
coastertux is just really nicecoastertux is just really nicecoastertux is just really nicecoastertux is just really nicecoastertux is just really nice
Send a message via AIM to coastertux
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!
Reply With Quote
  #40   Spotlight this post!  
Unread 06-12-2005, 21:39
CJO's Avatar
CJO CJO is offline
Emeritus Pain in the $@#$@#$@#
AKA: Christopher J. O'Connell
None #1097 (Site 3 Engineering)
Team Role: Alumni
 
Join Date: Feb 2003
Location: Latrobe (over the rainbow), CA
Posts: 217
CJO will become famous soon enoughCJO will become famous soon enough
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.
__________________
Team 1097 -- Site 3 Engineering
~~~~~~~~~~~~~~~~~~~~
2003 Sacramento Rookie All Star
2003 Silicon Valley Rookie All Star
2004 Sacramento Engineering Inspiration Award
2004 Sacramento Visualization Award
2004 Outstanding Volunteer Award (G. Glasser)
2004 Silicon Valley Sportsmanship Award
2004 National Visualization Runner Up
2004 Cal Games Finalist
2005 Sacramento Sportsmanship Award
2005 Sacramento #1 seed
2005 Sacramento Finalist

2005 Silicon Valley Sportsmanship Award
2005 Silicon Valley #1 Seed
2005 Silicon Valley Finalist

Reply With Quote
  #41   Spotlight this post!  
Unread 06-12-2005, 22:27
gburlison gburlison is offline
Mentor
FRC #0662 (Rocky Mountain Robotics)
Team Role: Mentor
 
Join Date: Sep 2002
Rookie Year: 2000
Location: Colorado Springs, CO
Posts: 245
gburlison is a name known to allgburlison is a name known to allgburlison is a name known to allgburlison is a name known to allgburlison is a name known to allgburlison is a name known to all
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.
__________________
Gordon Burlison - Mentor
662/Rocky Mountain Robotics
"Every silver lining's got a Touch of grey - Robert Hunter"
"No sense in being pessimistic, it wouldn't work anyway"
Reply With Quote
  #42   Spotlight this post!  
Unread 07-12-2005, 00:15
CraigHickman
 
Posts: n/a
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.
Reply With Quote
  #43   Spotlight this post!  
Unread 07-12-2005, 22:24
Venkatesh Venkatesh is offline
Registered User
FRC #0030
 
Join Date: Jan 2003
Rookie Year: 2002
Location: USA
Posts: 260
Venkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to beholdVenkatesh is a splendid one to behold
Re: Enough buying talk. Let's hear about ghettofab!

Quote:
(sounds like the early days of FIRST)
They just hide the duct tape better these days.
__________________
-- vs, me@acm.jhu.edu
Mentor, Team 1719, 2007
Team 30, 2002-2005

Last edited by Venkatesh : 07-12-2005 at 22:24. Reason: bbCode mistake
Reply With Quote
  #44   Spotlight this post!  
Unread 07-12-2005, 23:51
sciencenerd's Avatar
sciencenerd sciencenerd is offline
ooh, what does this button do?
AKA: Kyle
FRC #1318 (the IRS (Issaquah Robotics Society))
Team Role: Coach
 
Join Date: Jan 2005
Rookie Year: 2005
Location: Bellevue, Washington
Posts: 206
sciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud ofsciencenerd has much to be proud of
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.
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 21:01.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi