Quote:
Originally Posted by bobby5150
I dont have the specifics at hand, but I'll try my best.
Our robot was 119.9lbs w/o bumpers or battery.
I cant remember exactly what it was, but it would top out around 10fps.
1" aluminum box tubing 1/8th" thick.
With the bumpers, I believe it weighed around 130lbs.
We used the 6" kit wheels.
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Nothing seems out of the ordinary here. Weight/Gearing aren't out of wack (good speed for a heavy bot). A frame with that tubing can be crazy stiff if welded properly.
How crazy were your drivers during your competitions? Where there many instances of slamming the robot controls the opposite direction when the bot was at full speed?
Also, is there any possibility that the output shaft bearing popped out slightly (the one in the plastic, where the encoder goes)? Any sort of lateral stress on the CIMple box output shaft (over-tension on chain, massive shifts in control that are opposite the robot's momentum which 'snap' the chain into high tension) can lead to fatigue in the plastic over time that causes the bearing to unseat. This could cause the opposite bearing on the output shaft (the one in the metal) to seize, which could then cause the CIM gears to shred. It only takes 1-2 degrees of bearing misalignment for these bearings to become VERY inefficient; any more and they probably did seize.