Quote:
Originally Posted by NeedMoreEngines
Well, I've been reading through this thread, and I'm about to throw up.
We bought the 2-CIM adaptor for the 56mm planetaries.
We bought the 16:1 conversion kits.
Somewhere, some mechanical engineer reading this post is laughing his head off.
We've basically done what everyone has been saying NOT to do.
What still bothers me is this:
Why would FIRST supply us with products that clearly were not properly engineered? Or, look at it this way. Maybe these things are substantial. FIRST usually does things the right way, wouldn't they have faith in the company that is supplying such a critical component in the KOP?
I...I don't know what to say. I am at a toal loss for words. I want to have faith in the 56mm's, but everyone is basically saying "ehh...notsomuch!"
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I cannot disagree with you more strongly.
It is not
clear at all that we will see failures in the field of this joint.
Looking at the design, my gut told me that perhaps there might be a problem. I have done quite a lot of work to try to get the answer to the questions.
Again, you image that FIRST has a Great Oz working behind the scenes to ensure that there is never a mistake made. Trust me, there is no Great Oz. There are only frail human beings trying their best to get great things in the KOP without breaking the bank.
Now back to the problem at hand. Contrary to my initial gut feeling, my analysis up to this point leads me to believe that if the carriers were hardened to the same spec as the shaft, the gearbox will likely perform without failures, even for the 2 CIM + 16:1 set up. This is a pretty straightforward fix that should not cause an undue hardship on any team.
Again, the big unknow is the dynamic loading we expect. Is there a team availalble that can quickly adapt a chassis as a test buck for me? I want to do 4 tests each with a 120lbs robot, 500 cycles of
1) apply full forward,
2) reach full speed forward,
3) apply full reverse,
4) reach full speed in reverse
5) repeat
Test 1: 12:1 gearbox 1 CIM per side
Test 2: 12:1 gearbox W/2 CIM adaptor
Test 3: 16:1 gearbox 1 CIM per side
Test 4: 16:1 gearbox W/2 CIM adaptor
The motors/gearboxes needed to do these tests will be provided.
Are there any takers? PM me ASAP.
Joe J.