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Originally Posted by Rob Colatutto
I'm no electrician here... but I would take a guess and say putting your motor in liquid nitrogen is probably not a very good practice if you want to have a working motor... Taking a blow torch to the gear could also severly weaken it. There is nothing wrong with having concern and giving advice against doing something that you know isn't the correct method doing the job. We are trying to learn about engineering and teaching others in FIRST, not about cobbing up a job that is easily done correctly.
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dipping the shaft in liquid nitrogen won't cause any problems to the motor. using a blowtorch on the gear won't either. both of these are common practices in the engineering world. When fittings are needed that are extremely tight, to the extent that the shaft diameter is greater than the hole diameter by very large amounts, these practices are used along with a press fitting. The end result is an EXTREMELY tight interference fitting. If a team doesn't have a press, these practices are accepted in the engineering field, and because, as you say, we should be teaching engineering, i figured i'd throw a little bit more engineering knowledge into the mix, being that nobody's posted that as a way to fit the gear on. again, please look into what you're talking about before making blind assumptions