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Originally Posted by RobDeCotiis
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.
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Cooling the shaft is probably OK. Blowtorching the gear probably is not. You can create huge stresses in the part, and you are chaning the material properties. The sudden change in temperature can be damaging. Parts are usually heted in a controlled process, like an oven that gradually increases the temperature.
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Originally Posted by RobDeCotiis
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.
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Yes, the practice of creating interference fits is common and used in many engineering applications.
It is a very controlled process. Part diameters are defined, analysis is completed. An interference might be thousandths or ten-thousandths. When you create this tight fit, you add new stresses in the mating parts and if the fit is too tight, one or both parts can fail.
Do you know what kind of interference you are making? Did you measure the parts first?
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Originally Posted by RobDeCotiis
and because, as you say, we should be teaching engineering, i figured i'd throw a little bit more engineering knowledge into the mix, ... again, please look into what you're talking about before making blind assumptions
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