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Originally Posted by Hachiban VIII
But we have a problem. Due to a lack of sophisticated tools we were never able to balance our shooter. When spun at top speed it releases the most deafening racket I have ever heard on a FIRST robot. It quite literally sounds like a jackhammer or possibly even a machine gun.  .
We don't know what causes this problem. The best hypothesis seems to be that at a certain speed the shooter's chain begins to vibrate making noise. |
From your description, it seems that a mechanical reasonance is being excited in your chain at a specific speed. In general, chains are meant for slow speed operation, where such reasonances do not occur. If you have any flexibility in the mounting, shorten the chain as much as you can.
Safety will be the most important concern of the technical inspectors for the Cal Games, as it always is at a FIRST competition. If you are concerned about whether a mechanism on your robot is safe (making sounds like a jackhammer or machine gun are not great indicators) you can be sure that technical inspectors will be concerned as well. It can't be judged, however, until it is seen (and heard) at the Cal Games.
See you there...
Eugene Brooks