Tuesday, April 8, 2014

Rolling Frame

Finally! We are finished with the mechanical side of our go-kart. After spending virtually every waking hour in the shop this last week, we have a rolling go kart with steering, braking, mounted motors, and seating.





We designed the geometry for our Ackerman steering linkage in a 3D sketch in SolidWorks. We then used the dimensions from the sketch to build the steering assembly on our kart.



To assemble the the wheels we bolted together a block of aluminum and a waterjetted piece of quarter inch aluminum which connects to the steering column with a tie rod as shown.



As you can see, the kingpin bolt goes through both the aluminum block and the quarter inch aluminum to allow the wheels to turn. We bolted the wheel itself into a threaded hold in the end of the aluminum block with a spacer in between to allow the wheel to spin freely.

We attached the steering column to the frame through 3D printed bushings, where it is held in place by aluminum collars.



The brake cables are bolted to the pedal at the front of the frame which is held in place by eighth inch aluminum tabs. The cables and housing then run back to each rear wheel, where they connect to the brake calipers. To mount the brake calipers to the frame we again used quarter inch aluminum. Our original design had our brake calipers mounted under the frame. However, when we went to bolt them on we realized that they were too big and would drag on the ground. To fix this problem we cut more quarter inch aluminum on the band saw and mounted the calipers on top of the rotor as shown.






Going forward from here, we need to hook up our batteries, motor controllers, switches and throttle.



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