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Unread 18-03-2003, 16:20
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Paul Copioli Paul Copioli is offline
President, VEX Robotics, Inc.
FRC #3310 (Black Hawk Robotics)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 2000
Location: Rockwall, TX
Posts: 1,382
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Buckeye & Pittsburgh

We scouted Cleveland and timed every round on Saturday. Team 27 was consistently at the bins in 3.5 seconds. The next times were around 4.2 - 5.0 seconds (about 10 teams).

In Pittsburgh, we were the fastest (team 217) at 3.2 seconds on Friday, but we got progressively slower due to our drivetrain starting to bind (using bevel gears) and we eventually levelled off at about 3.6 seconds consistently on Saturday.

Team 45 was at around 4.0 seconds and team 548 was at 4.1 seconds by the middle of Saturday competition. Many teams at Pittsburgh were from the 5.0 to 6.0 time range. We have all the times from Pittsburgh and I will try to have a list ready by Great Lakes.

-Paul

EDIT: I just saw Ken's post and I will try to respond to how we do it. We have 4 wheel drive with front wheel steering. We have a separate microcontroller (a PIC) which tells the robot what steering angle to be at. The wheels stay at this steering angle until the gyro indicates that the ramp has been hit (gyro used as a trigger), then we straighten the wheels and deploy the wings. After we hit the stack we shift gears into low and creep down the ramp. We use the Chips and Drills to drive with 4" wheels. Our gear ratio from the chips is around 6:1. Our tread material has a coefficient of friction with the carpet of 1.5.

-Paul

Last edited by Paul Copioli : 18-03-2003 at 16:42.