Quote:
Originally Posted by Coach Norm
I have a question about the Choo Choo and the Lexan tab mentioned in the blog. I do not completely understand how the Lexan is used with the alignment and cannot find it in the CAD drawings. I know a picture was posted in the blog but could not wrap my head around how this tab was used.
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This was one casualty of trying to liveblog while our team of stellar engineers worked faster than I could type - at one point it was the plan, but as Aren said, the ratchet wrench + limit switch ended up working fine.
The idea was that the tab hung down vertically in between the two gears of the choo-choo. During normal operation, the larger gear spun clockwise, brushing the lexan out of the way (think sort of like a playing card in a bicycle spoke). However, if the system tried to backdrive, the interface between the two gears would reverse, choking the lexan tab into tension between the two gears and locking it up.