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#16
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The Carpet Test
Posted by Dodd Stacy at 1/23/2001 9:18 PM EST
Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE. In Reply to: 3 Choices - Hurt Carpet, Motors or Wheels Posted by Raul on 1/23/2001 6:59 PM EST: : However, be aware that if you do use sharp edges as a way to get great traction , FIRST will likely ask you to do the carpet test. I believe that means running your robot against a wall. So in that case you have to make sure that you have so much traction that it will just stall your motors. I think TKO had this configuration with their tank treads in 99. : Raul FWIW. In 98's Ladder Logic, we anticipated just this scenario. We machined little pyramid spikes, about 1/16" square at the base, on aluminum wheels and geared just tall enough to stall the motors up against the wall. The tech inspector took one look at our wheels and put us to the carpet test. However - surprise - when he saw that we stalled, he lifted our wheels off the ground, let them spin up to free speed then lowered just enough weight back down on the carpet to load the wheels heavily (at full stick) but not quite stall the motors. Needless to say, you can burn the carpet with rubber Skyway tread with this test. Fair? Legitimate? We didn't think so at the time, and I still think it was arbitrary and discriminatory. But I'm not posting to rant. I'm posting to warn inexperienced teams that this is a gray area, and the FIRST folks have a playing field to maintain. They are not obliged to take risks with us tearing it up, and they make the rules. Be prepared with conservative options if you want to push the traction envelope, or be prepared to trailer your bot without competing. Dodd PS We teched just behind TKO at one of the tournaments, and I think the only reason they made it was that the inspector couldn't figure out how to lift up a tracked vehicle. |
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#17
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The Carpet Shredder
Posted by Ken Wilson at 1/24/2001 5:03 AM EST
Engineer on team #248, FEMEX, from Philadelphia Girls High and PECO Energy Company. In Reply to: The Carpet Test Posted by Dodd Stacy on 1/23/2001 9:18 PM EST: : FWIW2 - At the Philly Alliance Double Trouble regional (CD was there, quite impressively), there was a bot (names withheld to protect the innocent) that had fluted aluminum ?lugs? fastened to roller chain for tractive means. The assy looked like and - more importantly - acted like chain saw chain. Not so successful attempts to climb the puck resulted in a spray of carpet shreds from the puck's upper periphery. That was apparently OK. Put another point in the "inconsistent or selective judicial application" column. kenny |
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#18
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Be sure to Deburr
Posted by Jason Iannuzzi at 1/24/2001 10:05 AM EST
Engineer on team #11, Marauders, from Mt. Olive HS. and BASF, Rame Hart, CCM. In Reply to: Sharp Wheels Posted by Josh Vetter on 1/23/2001 12:04 PM EST: I think almost any wheel type would be OK, just make sure you have removed the sharp edges. If you use a gear, try running all the teeth through a wire wheel first, it will remove the burrs and significantly reduce carpet destruction. |
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