When we recently test drove our robot on asphalt the molded plastic wheel hubs on the side opposite the sprocket eventually cracked and broke on all four wheels. We used the three 1 1/2 inch long screws to attach the sprocket to the outer hub. We used the nylon spacers between the sprocket and inner hub. The nuts were inserted in the outer plastic hub. We did not over tighten the nuts. We only used 3 screws as per a diagram from Small Parts. The hub kit has 1 inch screws and 1 1/2 inch screws. Should we be using 6 long screws to tie everything together or maybe 3 long screws for the sprocket and 3 short screws that would connect the inner and outer hubs together. We’re using the smaller Skyway wheelchair wheels.
When the hubs broke we made a large aluminum washer for the side opposite the sprocket that would hopefully spread out the force on the outer plastic hub. But maybe we should be using 6 bolts either 3 long and 3 short or 6 long (from sprocket to outer hub) and no outer washer. What do you suggest?
Also, we noticed one of our drill motors metal outer casing was discoloring - it was really getting hot. We had no fan on the motor and we were running at the high speed. Could the fan have prevented this or might there be something wrong with the motor? Any suggestions or recommendations.
We’re using tie wraps to keep the speed changer in place. Maybe we should be using hose clamps.
The last item is that the indicator on the the Robot controller “No Data Radio” flashes on and off every so often. We think the robot kinds of stops and goes when this happens. We think this also happens when it is on the tether. Could one of the motors be generating too much current and the circuit breaker opens and then closes or the controller shuts down and then restarts when the breaker opens and closes. Not sure how this relates to “No Data Radio”
Will, Team #751