[Rosiebotboss]

Originally Posted by Ben Piecuch

Whoa, let me get a grip on what you're saying here Joe.

You're saying that the FIRST Supplied Kit gearbox, the 56mm, small CIM, primary drive 12:1 ratio gearbox is barely adequate (about 2x factor of safety) for a single CIM install under cyclic loading. Yet, FIRST and Banebots offer a 2x CIM adapter for use in these exact transmissions? Doesn't this 2x CIM adapter effectively reduce my factor of safety on that double-D to 1x?
(I won't even get into the gear change option that brings this gearbox to a 16:1 ratio...)

Is this a good thing? Am I supposed to feel confident in the fact that FIRST and Banebots have given us a product to hang ourselves with? And, to discover this at week 3 into our build? I'm a little disturbed here!

I can understand doing my own Due Diligence on a COTS part that I purchased for my robot. But I should't expect to have to do the same to a FIRST supplied and mechanically approved part(s.) Correctly me if I'm wrong here, Joe. (Please...)

BEN

Ben and Joe,

You're both making me nervous. We are in the same boat. Having trusted FIRST to do some of the "due diligence" for us, we are using the 2 into 1 adaptor as well.
I do not have any experience with the set up yet as we have not powered up the drive train yet. Although, Ben, check the run out of the 2 spur gears that mesh the CIMs into the BB 'top hat'. One of the sets out of three we bought is out by a lot, probably 5-10 degrees. Too much for my taste, BB has an email to answer.