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| May 12, 2008
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computer | sensors | interfacing | programming | parts & suppliers smallbotproject step 4. third 'wheel' Step 4. Once the motors are mounted, and the batteries are attached, you need to make a third point of support. I first thought I'd use half a ping-pong ball, but while wandering the aisles of Home Depot, I decided to use a cheap plastic $0.99 cabinet door-knob. However, the knob shaft is a little too long for the robot, so depending on the size of your motors, and wheels you will need to cut off a length of the shaft. When the robot sits on the ground, it should have an ever so slight backward tilt. By the way, the back of the robot is the heaviest side of the platform after mounting the motors and wheels. Next, you mount the knob centered on the rear of the platform. Because part of the knob is missing, I couldnt' find a screw wide enough to take hold of the knob but short enough not to rip through the bottom. So I found a screw wide enough, and used hex bolts to use up the extra length. 
 Notice the nuts as spacers computer | sensors | interfacing | programming | parts & suppliers |
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