Gear

built by Chris McDonald

*
Target Environment Locomotion Method
Indoors 3 Wheels
Sensors / Input Devices Actuators / Output Devices
N/A drive motors
hocky stick
Control Method Power Source
Radio/Control Battery
CPU Type Operating System
N/A N/A
Programming Lanuage Weight
N/A N/A
Time to build Cost to build
N/A N/A
URL for more information
http://treetech.dyndns.org/
Comments
The Treetech robotics team from Stephenville, Newfoundland, Canada went to the Canada First Robotics games just a few months ago bringing home the Jim Floyd award for design excellence, the entrepreneurship award, 3rd in best engineering panel presentation, and 2nd for Best dressed robot. This years sport was RoboHockey and we finished 7th over all out of 22 in the competion.

Our robot was controled by a standard R/C controler that was suplied by canada first along with a revicer and controler board. Because of this the electronics side was pretty strait forward. Though we did have a few problems with the control board because of bad instructions sent to us by canada first and a few faults in the design of the board. The robot was powered by two cord less tools batteries.

The mechanics of this robot was where the challange was. We had to build and design a device that was contained inside of a standard Rubermade garbage can and shoot a street hockey puck around 20 feet. We also wanted to be able to shoot from either the left or the right of the robot so we decided that having a shaft that could shoot out from the center of the robot would do the job nicely. Then came the problem of how to store a large amount of energy and then relese it when we needed it. So we came up with a winding mechinism that pulled the shaft back storeing energy in the springs. Then when we are ready to shoot the puck we would release a cluch in the winding mech. that would let the cable free wheel letting the energy travel from the springs down the shaft, to the stick and then finaly into the puck. Finaly turing the stick was done simply by bycicle cables attached to a pully on a motor on top of the robot and a pully on top of the stick.

The drive system was prety strait forward. We had two windsheild wiper motors(well thats what we think they are) that Canada first sent us. We got sprokets from old 10 speed bikes to and had them modifled to fit on a 1/2 shaft and used chain's to connect the motors to the drive s

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