Quote:
Originally Posted by maxnz
Yup, a Toughbox Mini. It is set at the standard gear reduction that is detailed in the assembly manual. If I remember correctly, it is 12.75:1 or something similar. We can try that tomorrow when we unbag the robot at state. Did it sound similar to what it sounded like in the video I posted?
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If you mean the sound at the end of the video, yes, that sounds familiar.
Has it always made the noise since the case was constructed?
If not, is there any chance some students went on a bolt tightening exercise recently?
Did you tape over the small holes on the back side to prevent debris from getting in?
I experienced the noise with a brand new case. Took it apart and reconstructed it twice. Discovered that if I tightened the plastic cover too much the noise was louder. I had a second case that was also brand new purchased at the same time. It made not a sound. Both were constructed at the same time, in tandem, and were identical as best as I could observe. I let off on the case bolts just till the noise was barely noticeable, then installed it CIMs and all into the chassis.
It actually got quieter over time. I had several theories about what it was, first was that the tightening of the case was causing the plastic to deform in a way that made it come in contact with one of the gears. The second was that the weight of the CIMS were doing something similar to the plastic cover. The third thing was that if there was some sort of contact or vibration, that the plastic cover was magnifying the sound like a drum.
I know for certain it was not the gears. The gears were clean with freshly applied grease. With the cover off it did not make a peep when turned. The gearing is ridiculously simple, the shafts confirmed to be mounted into the bearings until firmly seated. With the cover on, once tightened all the way down, it would make that rattle. Like as if gear teeth were coming contact with some part of the cover.
If you find that the noise goes away by loosening the cover just a bit, tighten it back down until the noise starts again and then just back off a touch. We got through two qualifiers, a district Championship and worlds and never once had an issue with either one.